diff --git a/api/src/main/java/io/cloudevents/CloudEvent.java b/api/src/main/java/io/cloudevents/CloudEvent.java
index 49c70867..068cdbec 100644
--- a/api/src/main/java/io/cloudevents/CloudEvent.java
+++ b/api/src/main/java/io/cloudevents/CloudEvent.java
@@ -17,36 +17,24 @@ package io.cloudevents;
 
 import java.net.URI;
 import java.time.ZonedDateTime;
-import java.util.Map;
+import java.util.List;
 import java.util.Optional;
 
 /**
- * An abstract event envelope, representing the 0.1 version of the <a href="https://github.com/cloudevents/spec/blob/master/spec.md">CNCF CloudEvent spec</a>.
+ * An abstract event envelope, representing the 0.2 version of the <a href="https://github.com/cloudevents/spec/blob/master/spec.md">CNCF CloudEvent spec</a>.
  *
  */
 public interface CloudEvent<T> {
 
-    // required
-    String EVENT_TYPE_KEY = "ce-eventType";
-    String CLOUD_EVENTS_VERSION_KEY = "ce-cloudEventsVersion";
-    String SOURCE_KEY = "ce-source";
-    String EVENT_ID_KEY = "ce-eventID";
-
-    // none-required
-    String EVENT_TYPE_VERSION_KEY = "ce-eventTypeVersion";
-    String EVENT_TIME_KEY = "ce-eventTime";
-    String SCHEMA_URL_KEY = "ce-schemaURL";
-    String HEADER_PREFIX = "ce-x-";
-
     /**
      * Type of occurrence which has happened. Often this property is used for routing, observability, policy enforcement, etc.
      */
-    String getEventType();
+    String getType();
 
     /**
      * The version of the CloudEvents specification which the event uses. This enables the interpretation of the context.
      */
-    String getCloudEventsVersion();
+    String getSepcVersion();
 
     /**
      * This describes the event producer. Often this will include information such as the type of the event source, the organization publishing the event, and some unique identifiers.
@@ -57,16 +45,12 @@ public interface CloudEvent<T> {
     /**
      * ID of the event. The semantics of this string are explicitly undefined to ease the implementation of producers. Enables deduplication.
      */
-    String getEventID();
+    String getId();
 
-    /**
-     * The version of the eventType. This enables the interpretation of data by eventual consumers, requires the consumer to be knowledgeable about the producer.
-     */
-    Optional<String> getEventTypeVersion();
     /**
      * Timestamp of when the event happened.
      */
-    Optional<ZonedDateTime> getEventTime();
+    Optional<ZonedDateTime> getTime();
 
     /**
      * A link to the schema that the data attribute adheres to.
@@ -78,13 +62,13 @@ public interface CloudEvent<T> {
      */
     Optional<String> getContentType();
 
-    /**
-     * This is for additional metadata and this does not have a mandated structure. This enables a place for custom fields a producer or middleware might want to include and provides a place to test metadata before adding them to the CloudEvents specification.
-     */
-    Optional<Map> getExtensions();
-
     /**
      * The event payload. The payload depends on the eventType, schemaURL and eventTypeVersion, the payload is encoded into a media format which is specified by the contentType attribute (e.g. application/json).
      */
     Optional<T> getData();
+
+    /**
+     *
+     */
+    Optional<List<Extension>> getExtensions();
 }
\ No newline at end of file
diff --git a/api/src/main/java/io/cloudevents/CloudEventBuilder.java b/api/src/main/java/io/cloudevents/CloudEventBuilder.java
index 787f8e54..2e37231c 100644
--- a/api/src/main/java/io/cloudevents/CloudEventBuilder.java
+++ b/api/src/main/java/io/cloudevents/CloudEventBuilder.java
@@ -19,39 +19,40 @@ import io.cloudevents.impl.DefaultCloudEventImpl;
 
 import java.net.URI;
 import java.time.ZonedDateTime;
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 
 /**
  * Builder class to create a Java Object representing a CloudEvent implementation
  * @param <T> type of the data field
  */
-public class  CloudEventBuilder<T> {
+public class CloudEventBuilder<T> {
 
-    private final String cloudEventsVersion = "0.1";
-    private Map<?,?> extensions = new LinkedHashMap();
+    private String specversion;
     private String contentType;
-    private String eventType;
+    private String type;
     private URI source;
-    private String eventID;
-    private String eventTypeVersion;
-    private ZonedDateTime eventTime;
+    private String id;
+    private ZonedDateTime time;
     private URI schemaURL;
     private T data;
+    private final List<Extension> extensions = new ArrayList<>();
 
     /**
-     * Type of occurrence which has happened. Often this property is used for routing, observability, policy enforcement, etc.
+     * The version of the CloudEvents specification which the event uses.
      */
-    public CloudEventBuilder<T> eventType(final String eventType) {
-        this.eventType = eventType;
+    public CloudEventBuilder<T> specVersion(final String specVersion) {
+        this.specversion = specVersion;
         return this;
     }
 
     /**
-     * The version of the eventType. This enables the interpretation of data by eventual consumers, requires the consumer to be knowledgeable about the producer.
+     * Type of occurrence which has happened. Often this property is used for routing, observability, policy enforcement, etc.
      */
-    public CloudEventBuilder<T> eventTypeVersion(final String eventTypeVersion) {
-        this.eventTypeVersion = eventTypeVersion;
+    public CloudEventBuilder<T> type(final String type) {
+        this.type = type;
         return this;
     }
 
@@ -68,16 +69,16 @@ public class  CloudEventBuilder<T> {
     /**
      * ID of the event. The semantics of this string are explicitly undefined to ease the implementation of producers. Enables deduplication.
      */
-    public CloudEventBuilder<T> eventID(final String eventID) {
-        this.eventID = eventID;
+    public CloudEventBuilder<T> id(final String id) {
+        this.id = id;
         return this;
     }
 
     /**
      * Timestamp of when the event happened.
      */
-    public CloudEventBuilder<T> eventTime(final ZonedDateTime eventTime) {
-        this.eventTime = eventTime;
+    public CloudEventBuilder<T> time(final ZonedDateTime time) {
+        this.time = time;
         return this;
     }
 
@@ -98,32 +99,32 @@ public class  CloudEventBuilder<T> {
     }
 
     /**
-     * This is for additional metadata and this does not have a mandated structure. This enables a place for custom
-     * fields a producer or middleware might want to include and provides a place to test metadata before adding them
-     * to the CloudEvents specification.
-     */
-    public CloudEventBuilder<T> extensions(final Map extensions) {
-        this.extensions = extensions;
-        return this;
-    }
-
-    /**
-     * The event payload. The payload depends on the eventType, schemaURL and eventTypeVersion, the payload is encoded into a media format which is specified by the contentType attribute (e.g. application/json).
+     * The event payload. The payload depends on the type and schemaURL, the payload is encoded into a media format which is specified by the contenttype attribute (e.g. application/json).
      */
     public CloudEventBuilder<T> data(final T data) {
         this.data = data;
         return this;
     }
 
+    public CloudEventBuilder<T> extension(final Extension extension) {
+        this.extensions.add(extension);
+        return this;
+    }
+
     /**
      * Constructs a new {@link CloudEvent} with the previously-set configuration.
      */
     public CloudEvent<T> build() {
 
-        if (eventType == null || cloudEventsVersion == null || source == null || eventID == null) {
+        // forcing latest (default) version
+        if (specversion == null) {
+            specversion = SpecVersion.DEFAULT.toString();
+        }
+
+        if (type == null || source == null || id == null) {
             throw new IllegalArgumentException("please provide all required fields");
         }
 
-        return new DefaultCloudEventImpl<T>(eventType, cloudEventsVersion, source, eventID, eventTypeVersion, eventTime, schemaURL, contentType, extensions, data);
+        return new DefaultCloudEventImpl<T>(type, specversion, source, id, time, schemaURL, contentType, data, extensions);
     }
-}
\ No newline at end of file
+}
diff --git a/api/src/main/java/io/cloudevents/Extension.java b/api/src/main/java/io/cloudevents/Extension.java
new file mode 100644
index 00000000..62d15512
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/Extension.java
@@ -0,0 +1,19 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents;
+
+public interface Extension {
+}
diff --git a/api/src/main/java/io/cloudevents/SpecVersion.java b/api/src/main/java/io/cloudevents/SpecVersion.java
new file mode 100644
index 00000000..1b2236ae
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/SpecVersion.java
@@ -0,0 +1,68 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public enum SpecVersion {
+
+    V_01("0.1"),
+    V_02("0.2"),
+    DEFAULT(V_02.toString());
+
+    private final String version;
+
+    SpecVersion(final String version) {
+        this.version = version;
+    }
+
+    @Override
+    public String toString() {
+        return version;
+    }
+
+    public String version() {
+        return version;
+    }
+
+    public static SpecVersion fromVersion(final String version) {
+        if (version == null)
+            return null;
+
+        final SpecVersion specVersion= VERSION_TO_SPEC.get(version);
+
+        if (specVersion == null)
+            throw new IllegalArgumentException();
+
+        return specVersion;
+    }
+
+    private static final Map<String, SpecVersion> VERSION_TO_SPEC =
+            new HashMap<>();
+
+    static
+    {
+        SpecVersion[] instances = SpecVersion.class.getEnumConstants();
+
+        for (int i = 0; i < instances.length; i++)
+        {
+            VERSION_TO_SPEC.put(instances[i].toString(), instances[i]);
+        }
+    }
+
+
+}
diff --git a/api/src/main/java/io/cloudevents/extensions/DistributedTracingExtension.java b/api/src/main/java/io/cloudevents/extensions/DistributedTracingExtension.java
new file mode 100644
index 00000000..402ceb6b
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/extensions/DistributedTracingExtension.java
@@ -0,0 +1,33 @@
+package io.cloudevents.extensions;
+
+import io.cloudevents.Extension;
+
+public class DistributedTracingExtension implements Extension {
+
+    private String traceparent;
+    private String tracestate;
+
+    public String getTraceparent() {
+        return traceparent;
+    }
+
+    public void setTraceparent(String traceparent) {
+        this.traceparent = traceparent;
+    }
+
+    public String getTracestate() {
+        return tracestate;
+    }
+
+    public void setTracestate(String tracestate) {
+        this.tracestate = tracestate;
+    }
+
+    @Override
+    public String toString() {
+        return "DistributedTracingExtension{" +
+                "traceparent='" + traceparent + '\'' +
+                ", tracestate='" + tracestate + '\'' +
+                '}';
+    }
+}
diff --git a/api/src/main/java/io/cloudevents/http/HttpTransportAttributes.java b/api/src/main/java/io/cloudevents/http/HttpTransportAttributes.java
new file mode 100644
index 00000000..b2cded89
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/http/HttpTransportAttributes.java
@@ -0,0 +1,46 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents.http;
+
+import io.cloudevents.SpecVersion;
+
+import static io.cloudevents.SpecVersion.V_01;
+
+public interface HttpTransportAttributes {
+
+    // required attrs
+    String typeKey();
+    String specVersionKey();
+    String sourceKey();
+    String idKey();
+
+    // none-required attrs
+    String timeKey();
+    String schemaUrlKey();
+
+    static HttpTransportAttributes getHttpAttributesForSpec(final SpecVersion specVersion) {
+
+        switch (specVersion) {
+
+            case V_01: return new V01HttpTransportMappers();
+            case V_02:
+            case DEFAULT: return new V02HttpTransportMappers();
+        }
+
+        // you should not be here!
+        throw new IllegalArgumentException("Could not find proper version");
+    }
+}
diff --git a/api/src/main/java/io/cloudevents/http/V01HttpTransportMappers.java b/api/src/main/java/io/cloudevents/http/V01HttpTransportMappers.java
new file mode 100644
index 00000000..d32b3a73
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/http/V01HttpTransportMappers.java
@@ -0,0 +1,51 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents.http;
+
+public class V01HttpTransportMappers implements HttpTransportAttributes {
+
+    public static final String SPEC_VERSION_KEY = "ce-cloudEventsVersion";
+
+    @Override
+    public String typeKey() {
+        return "ce-eventType";
+    }
+
+    @Override
+    public String specVersionKey() {
+        return SPEC_VERSION_KEY;
+    }
+
+    @Override
+    public String sourceKey() {
+        return "ce-source";
+    }
+
+    @Override
+    public String idKey() {
+        return "ce-eventID";
+    }
+
+    @Override
+    public String timeKey() {
+        return "ce-eventTime";
+    }
+
+    @Override
+    public String schemaUrlKey() {
+        return "ce-schemaURL";
+    }
+}
diff --git a/api/src/main/java/io/cloudevents/http/V02HttpTransportMappers.java b/api/src/main/java/io/cloudevents/http/V02HttpTransportMappers.java
new file mode 100644
index 00000000..ae97c20e
--- /dev/null
+++ b/api/src/main/java/io/cloudevents/http/V02HttpTransportMappers.java
@@ -0,0 +1,47 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents.http;
+
+public class V02HttpTransportMappers extends V01HttpTransportMappers {
+
+    public static final String SPEC_VERSION_KEY = "ce-specversion";
+
+    @Override
+    public String typeKey() {
+        return "ce-type";
+    }
+
+    @Override
+    public String specVersionKey() {
+        return SPEC_VERSION_KEY;
+    }
+
+    @Override
+    public String idKey() {
+        return "ce-id";
+    }
+
+    @Override
+    public String timeKey() {
+        return "ce-time";
+    }
+
+    @Override
+    public String schemaUrlKey() {
+        return "ce-schemaurl";
+    }
+
+}
diff --git a/api/src/main/java/io/cloudevents/impl/DefaultCloudEventImpl.java b/api/src/main/java/io/cloudevents/impl/DefaultCloudEventImpl.java
index c36d8ec1..d92e0946 100644
--- a/api/src/main/java/io/cloudevents/impl/DefaultCloudEventImpl.java
+++ b/api/src/main/java/io/cloudevents/impl/DefaultCloudEventImpl.java
@@ -15,12 +15,17 @@
  */
 package io.cloudevents.impl;
 
+import com.fasterxml.jackson.annotation.JsonAlias;
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import io.cloudevents.CloudEvent;
+import io.cloudevents.Extension;
+import io.cloudevents.SpecVersion;
 
 import java.io.Serializable;
 import java.net.URI;
 import java.time.ZonedDateTime;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 
@@ -29,32 +34,31 @@ import java.util.Optional;
  *
  * @param <T> generic type of the underlying data field.
  */
+@JsonIgnoreProperties(value = { "eventTypeVersion", "extensions" }) // was removed from 0.1
 public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
 
-    private static final long serialVersionUID = 1L;
+    private static final long serialVersionUID = 2L;
 
-    private String cloudEventsVersion = "0.1";
-    private Map extensions = null;
-    private String eventType = null;
+    private String specversion;
+    private String type = null;
     private URI source = null;
-    private String eventID = null;
-    private String eventTypeVersion = null;
-    private ZonedDateTime eventTime = null;
+    private String id = null;
+    private ZonedDateTime time = null;
     private URI schemaURL = null;
     private String contentType = null;
     private T data = null;
+    private List<Extension> extensions = null;
 
-    public DefaultCloudEventImpl(final String eventType, final String cloudEventsVersion, final URI source, final String eventID, final String eventTypeVersion, final ZonedDateTime eventTime, final URI schemaURL, final String contentType, final Map extensions, final T data) {
-        this.cloudEventsVersion = cloudEventsVersion;
-        this.extensions = extensions;
-        this.eventType = eventType;
+    public DefaultCloudEventImpl(final String type, final String specversion, final URI source, final String id, final ZonedDateTime time, final URI schemaURL, final String contentType, final T data, final List<Extension> extensions) {
+        this.specversion = specversion;
+        this.type = type;
         this.source = source;
-        this.eventID = eventID;
-        this.eventTypeVersion = eventTypeVersion;
-        this.eventTime = eventTime;
+        this.id = id;
+        this.time = time;
         this.schemaURL = schemaURL;
         this.contentType = contentType;
         this.data = data;
+        this.extensions = extensions;
     }
 
     DefaultCloudEventImpl() {
@@ -62,18 +66,13 @@ public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
     }
 
     @Override
-    public String getCloudEventsVersion() {
-        return cloudEventsVersion;
+    public String getSepcVersion() {
+        return specversion;
     }
 
     @Override
-    public Optional<Map> getExtensions() {
-        return Optional.ofNullable(extensions);
-    }
-
-    @Override
-    public String getEventType() {
-        return eventType;
+    public String getType() {
+        return type;
     }
 
     @Override
@@ -82,18 +81,13 @@ public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
     }
 
     @Override
-    public String getEventID() {
-        return eventID;
+    public String getId() {
+        return id;
     }
 
     @Override
-    public Optional<String> getEventTypeVersion() {
-        return Optional.ofNullable(eventTypeVersion);
-    }
-
-    @Override
-    public Optional<ZonedDateTime> getEventTime() {
-        return Optional.ofNullable(eventTime);
+    public Optional<ZonedDateTime> getTime() {
+        return Optional.ofNullable(time);
     }
 
     @Override
@@ -111,36 +105,36 @@ public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
         return Optional.ofNullable(data);
     }
 
+    @Override
+    public Optional<List<Extension>> getExtensions() {
+        return Optional.ofNullable(extensions);
+    }
 
     // protected setters, used for (JSON) deserialization
 
-    void setCloudEventsVersion(String cloudEventsVersion) {
-        this.cloudEventsVersion = cloudEventsVersion;
+    @JsonAlias({"specversion", "cloudEventsVersion"})
+    void setSpecversion(String specversion) {
+        this.specversion = specversion;
     }
 
-    void setExtensions(Map extensions) {
-        this.extensions = extensions;
-    }
-
-    void setEventType(String eventType) {
-        this.eventType = eventType;
+    @JsonAlias({"type", "eventType"})
+    void setType(String type) {
+        this.type = type;
     }
 
     void setSource(URI source) {
         this.source = source;
     }
 
-    void setEventID(String eventID) {
-        this.eventID = eventID;
-    }
-
-    void setEventTypeVersion(String eventTypeVersion) {
-        this.eventTypeVersion = eventTypeVersion;
+    @JsonAlias({"id", "eventID"})
+    void setId(String id) {
+        this.id = id;
     }
 
     @JsonDeserialize(using = ZonedDateTimeDeserializer.class)
-    void setEventTime(ZonedDateTime eventTime) {
-        this.eventTime = eventTime;
+    @JsonAlias({"time", "eventTime"})
+    void setTime(ZonedDateTime time) {
+        this.time = time;
     }
 
     void setSchemaURL(URI schemaURL) {
@@ -158,13 +152,11 @@ public class DefaultCloudEventImpl<T> implements CloudEvent<T>, Serializable {
     @Override
     public String toString() {
         return "DefaultCloudEventImpl{" +
-                "cloudEventsVersion='" + cloudEventsVersion + '\'' +
-                ", extensions=" + extensions +
-                ", eventType='" + eventType + '\'' +
+                "specversion='" + specversion + '\'' +
+                ", type='" + type + '\'' +
                 ", source=" + source +
-                ", eventID='" + eventID + '\'' +
-                ", eventTypeVersion='" + eventTypeVersion + '\'' +
-                ", eventTime=" + eventTime +
+                ", id='" + id + '\'' +
+                ", time=" + time +
                 ", schemaURL=" + schemaURL +
                 ", contentType='" + contentType + '\'' +
                 ", data=" + data +
diff --git a/api/src/test/java/io/cloudevents/CloudEventBuilderTest.java b/api/src/test/java/io/cloudevents/CloudEventBuilderTest.java
index 039ae8d7..898fc028 100644
--- a/api/src/test/java/io/cloudevents/CloudEventBuilderTest.java
+++ b/api/src/test/java/io/cloudevents/CloudEventBuilderTest.java
@@ -15,6 +15,7 @@
  */
 package io.cloudevents;
 
+import io.cloudevents.extensions.DistributedTracingExtension;
 import org.junit.Test;
 
 import java.net.URI;
@@ -34,26 +35,21 @@ public class CloudEventBuilderTest {
         final Map<String, String> keyValueStore = new HashMap<>();
         keyValueStore.put("key1", "value1");
         keyValueStore.put("key2", "value2");
-        final String eventId = UUID.randomUUID().toString();
+        final String id = UUID.randomUUID().toString();
         final URI src = URI.create("/trigger");
-        final String eventType = "My.Cloud.Event.Type";
-        final String eventTypeVersion = "2.0";
+        final String type = "My.Cloud.Event.Type";
         final ZonedDateTime eventTime = ZonedDateTime.now();
         final String contentType = "application/json";
         final URI schemaUri = URI.create("http://cloudevents.io/schema");
-        final Map<String, String> extensionData = new HashMap<>();
-        extensionData.put("foo", "bar");
 
         // when
         final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
                 .data(keyValueStore)
                 .contentType(contentType)
-                .eventType(eventType)
+                .type(type)
                 .schemaURL(schemaUri)
-                .eventTypeVersion(eventTypeVersion)
-                .eventTime(eventTime)
-                .extensions(extensionData)
-                .eventID(eventId)
+                .time(eventTime)
+                .id(id)
                 .source(src)
                 .build();
 
@@ -65,36 +61,139 @@ public class CloudEventBuilderTest {
         });
 
         assertThat(simpleKeyValueEvent.getContentType().get()).isEqualTo(contentType);
-        assertThat(simpleKeyValueEvent.getEventTime().get()).isEqualTo(eventTime);
-        assertThat(simpleKeyValueEvent.getEventID()).isEqualTo(eventId);
+        assertThat(simpleKeyValueEvent.getTime().get()).isEqualTo(eventTime);
+        assertThat(simpleKeyValueEvent.getId()).isEqualTo(id);
         assertThat(simpleKeyValueEvent.getSchemaURL().get()).isEqualTo(schemaUri);
-        assertThat(simpleKeyValueEvent.getEventType()).isEqualTo(eventType);
+        assertThat(simpleKeyValueEvent.getType()).isEqualTo(type);
         assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
-        assertThat(simpleKeyValueEvent.getExtensions().get()).isEqualTo(extensionData);
-        assertThat(simpleKeyValueEvent.getCloudEventsVersion()).isEqualTo("0.1");
-        assertThat(simpleKeyValueEvent.getEventTypeVersion().get()).isEqualTo("2.0");
+        assertThat(simpleKeyValueEvent.getSepcVersion()).isEqualTo(SpecVersion.DEFAULT.toString());
     }
 
     @Test
     public void testBuilderWithoutData() {
 
         // given
-        final String eventId = UUID.randomUUID().toString();
+        final String id = UUID.randomUUID().toString();
         final URI src = URI.create("/trigger");
-        final String eventType = "My.Cloud.Event.Type";
+        final String type = "My.Cloud.Event.Type";
 
         // when
         final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
-                .eventType(eventType)
-                .eventID(eventId)
+                .type(type)
+                .id(id)
                 .source(src)
                 .build();
         // than
         assertThat(simpleKeyValueEvent.getData().isPresent()).isFalse();
-        assertThat(simpleKeyValueEvent.getEventTime().isPresent()).isFalse();
-        assertThat(simpleKeyValueEvent.getEventID()).isEqualTo(eventId);
-        assertThat(simpleKeyValueEvent.getEventType()).isEqualTo(eventType);
+        assertThat(simpleKeyValueEvent.getTime().isPresent()).isFalse();
+        assertThat(simpleKeyValueEvent.getId()).isEqualTo(id);
+        assertThat(simpleKeyValueEvent.getType()).isEqualTo(type);
         assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
-        assertThat(simpleKeyValueEvent.getCloudEventsVersion()).isEqualTo("0.1");
+        assertThat(simpleKeyValueEvent.getSepcVersion()).isEqualTo(SpecVersion.DEFAULT.toString());
     }
+
+    @Test
+    public void testBuilderWithoutDataAndUrn() {
+
+        // given
+        final String id = UUID.randomUUID().toString();
+        final URI src = URI.create("urn:event:from:myapi/resourse/123");
+        final String type = "some.Cloud.Event.Type";
+
+        // when
+        final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
+                .type(type)
+                .id(id)
+                .source(src)
+                .build();
+        // than
+        assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
+    }
+
+    @Test
+    public void test01BuilderWithoutDataAndUrn() {
+
+        // given
+        final String id = UUID.randomUUID().toString();
+        final URI src = URI.create("urn:event:from:myapi/resourse/123");
+        final String type = "some.Cloud.Event.Type";
+
+        // when
+        final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
+                .specVersion("0.1")
+                .type(type)
+                .id(id)
+                .source(src)
+                .build();
+        // than
+        assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
+        assertThat(simpleKeyValueEvent.getSepcVersion()).isEqualTo(SpecVersion.V_01.toString());
+
+    }
+
+    @Test
+    public void testBuilderWithoutDataAndURISchema() {
+
+        // given
+        final String id = UUID.randomUUID().toString();
+        final URI src = URI.create("urn:event:from:myapi/resourse/123");
+        final String type = "some.Cloud.Event.Type";
+        final URI schema = URI.create("urn:oasis:names:specification:docbook:dtd:xml:4.1.2");
+
+        // when
+        final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
+                .type(type)
+                .id(id)
+                .source(src)
+                .schemaURL(schema)
+                .build();
+        // than
+        assertThat(simpleKeyValueEvent.getSchemaURL().get()).isEqualTo(schema);
+    }
+
+    @Test
+    public void testBuilderWithoutDataAndMailto() {
+
+        // given
+        final String id = UUID.randomUUID().toString();
+        final URI src = URI.create("mailto:cncf-wg-serverless@lists.cncf.io");
+        final String type = "My.Cloud.Event.Type";
+
+        // when
+        final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
+                .type(type)
+                .id(id)
+                .source(src)
+                .build();
+        // than
+        assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
+    }
+
+    @Test
+    public void testBuilderWithoutDataAndDistributedTracingExtension() {
+
+        // given
+        final String id = UUID.randomUUID().toString();
+        final URI src = URI.create("mailto:cncf-wg-serverless@lists.cncf.io");
+        final String type = "My.Cloud.Event.Type";
+        final DistributedTracingExtension dte = new DistributedTracingExtension();
+        dte.setTraceparent("00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01");
+        dte.setTracestate("congo=BleGNlZWRzIHRohbCBwbGVhc3VyZS4");
+
+        // when
+        final CloudEvent<Map<String, String>> simpleKeyValueEvent = new CloudEventBuilder()
+                .type(type)
+                .id(id)
+                .source(src)
+                .extension(dte)
+                .build();
+        // than
+        assertThat(simpleKeyValueEvent.getSource()).isEqualTo(src);
+        assertThat(simpleKeyValueEvent.getExtensions().get()).contains(dte);
+
+        Extension receivedDte = simpleKeyValueEvent.getExtensions().get().get(0);
+        assertThat(receivedDte).extracting("traceparent", "tracestate")
+                .contains("00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01", "congo=BleGNlZWRzIHRohbCBwbGVhc3VyZS4");
+    }
+
 }
diff --git a/api/src/test/java/io/cloudevents/CloudEventJacksonTest.java b/api/src/test/java/io/cloudevents/CloudEventJacksonTest.java
index 022d85bd..649ea6e0 100644
--- a/api/src/test/java/io/cloudevents/CloudEventJacksonTest.java
+++ b/api/src/test/java/io/cloudevents/CloudEventJacksonTest.java
@@ -28,9 +28,21 @@ import static org.assertj.core.api.Assertions.assertThat;
 public class CloudEventJacksonTest {
 
     @Test
-    public void testParseAzureJSON() {
-        CloudEvent<Map<String, ?>> ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("azure.json"));
-        assertThat(ce.getEventType()).isEqualTo("Microsoft.Storage.BlobCreated");
+    public void testParseAzure01JSON() {
+        CloudEvent<Map<String, ?>> ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("01_azure.json"));
+        assertThat(ce.getSepcVersion()).isEqualTo(SpecVersion.V_01.toString());
+        assertAzureCloudEvent(ce);
+    }
+
+    @Test
+    public void testParseAzure02JSON() {
+        CloudEvent<Map<String, ?>> ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("02_azure.json"));
+        assertThat(ce.getSepcVersion()).isEqualTo(SpecVersion.V_02.toString());
+        assertAzureCloudEvent(ce);
+    }
+
+    private void assertAzureCloudEvent(CloudEvent<Map<String, ?>> ce) {
+        assertThat(ce.getType()).isEqualTo("Microsoft.Storage.BlobCreated");
 
         ce.getData().ifPresent(data -> {
             assertThat(Map.class).isAssignableFrom(data.getClass());
@@ -40,16 +52,25 @@ public class CloudEventJacksonTest {
             assertThat(storageDiagnostics).containsOnlyKeys("batchId");
             assertThat(storageDiagnostics.get("batchId")).isEqualTo("ba4fb664-f289-4742-8067-6c859411b066");
         });
-
-
-
     }
 
     @Test
-    public void testParseAmazonJSON() {
-        CloudEvent ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("aws.json"));
-        assertThat(ce.getEventType()).isEqualTo("aws.s3.object.created");
+    public void testParseAmazon01JSON() {
+        CloudEvent ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("01_aws.json"));
+        assertAmazonCloudEvent(ce);
+    }
+
+    @Test
+    public void testParseAmazon02JSON() {
+        CloudEvent ce = JacksonMapper.fromInputStream(Thread.currentThread().getContextClassLoader().getResourceAsStream("02_aws.json"));
+        assertAmazonCloudEvent(ce);
+    }
+
+    private void assertAmazonCloudEvent(CloudEvent ce) {
+        assertThat(ce.getType()).isEqualTo("aws.s3.object.created");
+        assertThat(ce.getId()).isEqualTo("C234-1234-1234");
+        assertThat(ce.getData().isPresent());
         assertThat(ce.getSource().equals(URI.create("https://serverless.com")));
-        assertThat(ce.getEventTime().get()).isEqualTo(ZonedDateTime.parse("2018-04-26T14:48:09.769Z", ISO_ZONED_DATE_TIME));
+        assertThat(ce.getTime().get()).isEqualTo(ZonedDateTime.parse("2018-04-26T14:48:09.769Z", ISO_ZONED_DATE_TIME));
     }
 }
diff --git a/api/src/test/java/io/cloudevents/http/HttpTransportAttributesTest.java b/api/src/test/java/io/cloudevents/http/HttpTransportAttributesTest.java
new file mode 100644
index 00000000..16d9eadd
--- /dev/null
+++ b/api/src/test/java/io/cloudevents/http/HttpTransportAttributesTest.java
@@ -0,0 +1,52 @@
+/**
+ * Copyright 2018 The CloudEvents Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.cloudevents.http;
+
+import io.cloudevents.SpecVersion;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class HttpTransportAttributesTest {
+
+    @Test
+    public void testVersion01Headers() {
+
+        final HttpTransportAttributes v01 = HttpTransportAttributes.getHttpAttributesForSpec(SpecVersion.V_01);
+        assertThat(v01.specVersionKey()).isEqualTo("ce-cloudEventsVersion");
+        assertThat(v01.timeKey()).isEqualTo("ce-eventTime");
+        assertThat(v01.idKey()).isEqualTo("ce-eventID");
+        assertThat(v01.schemaUrlKey()).isEqualTo("ce-schemaURL");
+        assertThat(v01.typeKey()).isEqualTo("ce-eventType");
+
+        // non-changed between 01 / 02
+        assertThat(v01.sourceKey()).isEqualTo("ce-source");
+    }
+
+    @Test
+    public void testVersion02Headers() {
+
+        final HttpTransportAttributes v02 = HttpTransportAttributes.getHttpAttributesForSpec(SpecVersion.V_02);
+        assertThat(v02.specVersionKey()).isEqualTo("ce-specversion");
+        assertThat(v02.timeKey()).isEqualTo("ce-time");
+        assertThat(v02.idKey()).isEqualTo("ce-id");
+        assertThat(v02.schemaUrlKey()).isEqualTo("ce-schemaurl");
+        assertThat(v02.typeKey()).isEqualTo("ce-type");
+
+        // non-changed between 01 / 02
+        assertThat(v02.sourceKey()).isEqualTo("ce-source");
+    }
+}
diff --git a/api/src/test/resources/aws.json b/api/src/test/resources/01_aws.json
similarity index 100%
rename from api/src/test/resources/aws.json
rename to api/src/test/resources/01_aws.json
diff --git a/api/src/test/resources/azure.json b/api/src/test/resources/01_azure.json
similarity index 99%
rename from api/src/test/resources/azure.json
rename to api/src/test/resources/01_azure.json
index a659b30a..1c2d291a 100644
--- a/api/src/test/resources/azure.json
+++ b/api/src/test/resources/01_azure.json
@@ -18,4 +18,4 @@
     }
   },
   "source": "/subscriptions/326100e2-f69d-4268-8503-075374f62b6e/resourceGroups/cvtest34/providers/Microsoft.Storage/storageAccounts/cvtest34#/blobServices/default/containers/myfiles/blobs/IMG_20180224_0004.jpg"
-}
\ No newline at end of file
+}
diff --git a/api/src/test/resources/02_aws.json b/api/src/test/resources/02_aws.json
new file mode 100644
index 00000000..b069e17b
--- /dev/null
+++ b/api/src/test/resources/02_aws.json
@@ -0,0 +1,22 @@
+{
+  "type": "aws.s3.object.created",
+  "id": "C234-1234-1234",
+  "time": "2018-04-26T14:48:09.769Z",
+  "source": "https://serverless.com",
+  "contentType": "application/json",
+  "specversion": "0.2",
+  "data":
+  { "s3SchemaVersion": "1.0",
+    "configurationId": "cd267a38-30df-400e-9e3d-d0f1ca6e2410",
+    "bucket":
+    { "name": "cloudevents",
+      "ownerIdentity": {},
+      "arn": "arn:aws:s3:::cloudevents" },
+    "object":
+    { "key": "dan_kohn.jpg",
+      "size": 444684,
+      "eTag": "38b01ff16138d7ca0a0eb3f7a88ff815",
+      "sequencer": "005AE1E6A9A3D61490"
+    }
+  }
+}
\ No newline at end of file
diff --git a/api/src/test/resources/02_azure.json b/api/src/test/resources/02_azure.json
new file mode 100644
index 00000000..57c9f52d
--- /dev/null
+++ b/api/src/test/resources/02_azure.json
@@ -0,0 +1,21 @@
+{
+  "id": "96fb5f0b-001e-0108-6dfe-da6e2806f124",
+  "time": "2018-04-23T12:28:22.4579346Z",
+  "type": "Microsoft.Storage.BlobCreated",
+  "specversion": "0.2",
+  "data": {
+    "api": "PutBlockList",
+    "clientRequestId": "a23b4aba-2755-4107-8020-8ba6c54b203d",
+    "requestId": "96fb5f0b-001e-0108-6dfe-da6e28000000",
+    "eTag": "0x8D5A915B425AFFD",
+    "contentType": "image/jpeg",
+    "contentLength": 2779325,
+    "blobType": "BlockBlob",
+    "url": "https://cvtest34.blob.core.windows.net/myfiles/IMG_20180224_0004.jpg",
+    "sequencer": "000000000000000000000000000000BA00000000003db46c",
+    "storageDiagnostics": {
+      "batchId": "ba4fb664-f289-4742-8067-6c859411b066"
+    }
+  },
+  "source": "/subscriptions/326100e2-f69d-4268-8503-075374f62b6e/resourceGroups/cvtest34/providers/Microsoft.Storage/storageAccounts/cvtest34#/blobServices/default/containers/myfiles/blobs/IMG_20180224_0004.jpg"
+}
\ No newline at end of file
diff --git a/http/vertx/README.md b/http/vertx/README.md
index b12c19e6..970ae9c3 100644
--- a/http/vertx/README.md
+++ b/http/vertx/README.md
@@ -2,28 +2,29 @@
 
 ## Receiving CloudEvents
 
-Below is a sample on how to read CloudEvents from an HttpRequest:
+Below is a sample on how to use (Vert.x API for RxJava 2)[https://vertx.io/docs/vertx-rx/java2/] for reading CloudEvents from an HttpServerRequest:
 
 ```java
-import io.vertx.core.AbstractVerticle;
-public class Server extends AbstractVerticle {
+import io.cloudevents.http.reactivex.vertx.VertxCloudEvents;
+import io.vertx.core.http.HttpHeaders;
+import io.vertx.reactivex.core.AbstractVerticle;
+
+public class CloudEventVerticle extends AbstractVerticle {
+
   public void start() {
-    vertx.createHttpServer().requestHandler(req -> {
 
-      VertxCloudEvents.create().readFromRequest(req, reply -> {
-
-        if (reply.succeeded()) {
-
-          final CloudEvent<?> receivedEvent = reply.result();
-          // access the attributes:
-          System.out.println(receivedEvent.getEventID());
-          /// ...
-        });
-
-      req.response()
-        .putHeader("content-type", "text/plain")
-        .end("Got a CloudEvent!");
-    }).listen(8080);
+    vertx.createHttpServer()
+      .requestHandler(req -> VertxCloudEvents.create().rxReadFromRequest(req)
+      .subscribe((receivedEvent, throwable) -> {
+        if (receivedEvent != null) {
+          // I got a CloudEvent object:
+          System.out.println("The event type: " + receivedEvent.getEventType())
+        }
+      }))
+      .rxListen(8080)
+      .subscribe(server -> {
+        System.out.println("Server running!");
+    });
   }
 }
 ```
@@ -35,10 +36,12 @@ Below is a sample on how to use the client to send a CloudEvent:
 ```java
 final HttpClientRequest request = vertx.createHttpClient().post(8080, "localhost", "/");
 
+// add a client response handler
+request.handler(resp -> {
+    // react on the server response
+});
+
+// write the CloudEvent to the given HTTP Post request object
 VertxCloudEvents.create().writeToHttpClientRequest(cloudEvent, request);
-    request.handler(resp -> {
-        context.assertEquals(resp.statusCode(), 200);
-    });
 request.end();
 ```
-
diff --git a/http/vertx/src/main/java/io/cloudevents/http/vertx/VertxCloudEvents.java b/http/vertx/src/main/java/io/cloudevents/http/vertx/VertxCloudEvents.java
index bd5d4338..a99f2448 100644
--- a/http/vertx/src/main/java/io/cloudevents/http/vertx/VertxCloudEvents.java
+++ b/http/vertx/src/main/java/io/cloudevents/http/vertx/VertxCloudEvents.java
@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright 2018 The CloudEvents Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -16,6 +16,7 @@
 package io.cloudevents.http.vertx;
 
 import io.cloudevents.CloudEvent;
+import io.cloudevents.Extension;
 import io.cloudevents.http.vertx.impl.VertxCloudEventsImpl;
 import io.vertx.codegen.annotations.GenIgnore;
 import io.vertx.codegen.annotations.VertxGen;
@@ -24,6 +25,8 @@ import io.vertx.core.Handler;
 import io.vertx.core.http.HttpClientRequest;
 import io.vertx.core.http.HttpServerRequest;
 
+import java.util.List;
+
 @VertxGen
 public interface VertxCloudEvents {
 
@@ -34,6 +37,9 @@ public interface VertxCloudEvents {
     @GenIgnore(GenIgnore.PERMITTED_TYPE)
     <T> void readFromRequest(HttpServerRequest request, Handler<AsyncResult<CloudEvent<T>>> resultHandler);
 
+    @GenIgnore(GenIgnore.PERMITTED_TYPE)
+    <T> void readFromRequest(HttpServerRequest request, Class[] extensions, Handler<AsyncResult<CloudEvent<T>>> resultHandler);
+
     @GenIgnore(GenIgnore.PERMITTED_TYPE)
     <T> void writeToHttpClientRequest(CloudEvent<T> ce, HttpClientRequest request);
 }
diff --git a/http/vertx/src/main/java/io/cloudevents/http/vertx/impl/VertxCloudEventsImpl.java b/http/vertx/src/main/java/io/cloudevents/http/vertx/impl/VertxCloudEventsImpl.java
index b7c3a14f..5fc2f0c4 100644
--- a/http/vertx/src/main/java/io/cloudevents/http/vertx/impl/VertxCloudEventsImpl.java
+++ b/http/vertx/src/main/java/io/cloudevents/http/vertx/impl/VertxCloudEventsImpl.java
@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright 2018 The CloudEvents Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,6 +17,11 @@ package io.cloudevents.http.vertx.impl;
 
 import io.cloudevents.CloudEvent;
 import io.cloudevents.CloudEventBuilder;
+import io.cloudevents.Extension;
+import io.cloudevents.SpecVersion;
+import io.cloudevents.extensions.DistributedTracingExtension;
+import io.cloudevents.http.HttpTransportAttributes;
+import io.cloudevents.http.V02HttpTransportMappers;
 import io.cloudevents.http.vertx.VertxCloudEvents;
 import io.vertx.core.AsyncResult;
 import io.vertx.core.Future;
@@ -26,21 +31,19 @@ import io.vertx.core.buffer.Buffer;
 import io.vertx.core.http.HttpClientRequest;
 import io.vertx.core.http.HttpHeaders;
 import io.vertx.core.http.HttpServerRequest;
+import io.vertx.core.json.Json;
+import io.vertx.core.json.JsonObject;
 
+import java.io.Serializable;
+import java.lang.reflect.Field;
 import java.net.URI;
 import java.time.ZonedDateTime;
 import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
 import java.util.Map;
-import java.util.stream.Collectors;
-
-import static io.cloudevents.CloudEvent.CLOUD_EVENTS_VERSION_KEY;
-import static io.cloudevents.CloudEvent.EVENT_ID_KEY;
-import static io.cloudevents.CloudEvent.EVENT_TIME_KEY;
-import static io.cloudevents.CloudEvent.EVENT_TYPE_KEY;
-import static io.cloudevents.CloudEvent.EVENT_TYPE_VERSION_KEY;
-import static io.cloudevents.CloudEvent.HEADER_PREFIX;
-import static io.cloudevents.CloudEvent.SCHEMA_URL_KEY;
-import static io.cloudevents.CloudEvent.SOURCE_KEY;
 
 public final class VertxCloudEventsImpl implements VertxCloudEvents {
 
@@ -58,41 +61,75 @@ public final class VertxCloudEventsImpl implements VertxCloudEvents {
 
     @Override
     public <T> void readFromRequest(HttpServerRequest request, Handler<AsyncResult<CloudEvent<T>>> resultHandler) {
+        this.readFromRequest(request, null, resultHandler);
+
+    }
+
+    @Override
+    public <T> void readFromRequest(HttpServerRequest request, Class[] extensions, Handler<AsyncResult<CloudEvent<T>>> resultHandler) {
 
         final MultiMap headers = request.headers();
         final CloudEventBuilder builder = new CloudEventBuilder();
 
-        try {
-            // just check, no need to set the version
-            readRequiredHeaderValue(headers, CLOUD_EVENTS_VERSION_KEY);
 
+        final HttpTransportAttributes httpTransportKeys;
+        {
+            if (headers.contains(V02HttpTransportMappers.SPEC_VERSION_KEY)) {
+                httpTransportKeys = HttpTransportAttributes.getHttpAttributesForSpec(SpecVersion.V_02);
+            } else {
+                httpTransportKeys = HttpTransportAttributes.getHttpAttributesForSpec(SpecVersion.V_01);
+            }
+        }
+
+        try {
             builder
                     // set required values
-                    .eventType(readRequiredHeaderValue(headers, EVENT_TYPE_KEY))
-                    .source(URI.create(readRequiredHeaderValue(headers ,SOURCE_KEY)))
-                    .eventID(readRequiredHeaderValue(headers, EVENT_ID_KEY))
+                    .specVersion(readRequiredHeaderValue(headers, httpTransportKeys.specVersionKey()))
+                    .type(readRequiredHeaderValue(headers, httpTransportKeys.typeKey()))
+                    .source(URI.create(readRequiredHeaderValue(headers ,httpTransportKeys.sourceKey())))
+                    .id(readRequiredHeaderValue(headers, httpTransportKeys.idKey()))
 
                     // set optional values
-                    .eventTypeVersion(headers.get(EVENT_TYPE_VERSION_KEY))
                     .contentType(headers.get(HttpHeaders.CONTENT_TYPE));
 
-            final String eventTime = headers.get(EVENT_TIME_KEY);
+            final String eventTime = headers.get(httpTransportKeys.timeKey());
             if (eventTime != null) {
-                builder.eventTime(ZonedDateTime.parse(eventTime, DateTimeFormatter.ISO_OFFSET_DATE_TIME));
+                builder.time(ZonedDateTime.parse(eventTime, DateTimeFormatter.ISO_OFFSET_DATE_TIME));
             }
 
-            final String schemaURL = headers.get(SCHEMA_URL_KEY);
+            final String schemaURL = headers.get(httpTransportKeys.schemaUrlKey());
             if (schemaURL != null) {
                 builder.schemaURL(URI.create(schemaURL));
             }
 
-            // get the extensions
-            final Map<String, String> extensions =
-                    headers.entries().stream()
-                            .filter(header -> header.getKey().startsWith(HEADER_PREFIX))
-                            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
 
-            builder.extensions(extensions);
+            if (extensions != null && extensions.length > 0) {
+
+                // move this out
+                Arrays.asList(extensions).forEach(ext -> {
+
+                    try {
+                        Object extObj  = ext.newInstance();
+                        final JsonObject extension = new JsonObject();
+                        Field[] fields = ext.getDeclaredFields();
+
+                        for (Field field : fields) {
+                            boolean accessible = field.isAccessible();
+                            field.setAccessible(true);
+                            field.set(extObj, request.headers().get(field.getName()));
+                            field.setAccessible(accessible);
+                        }
+                        builder.extension((Extension) extObj);
+                    } catch (InstantiationException e) {
+                        e.printStackTrace();
+                    } catch (IllegalAccessException e) {
+                        e.printStackTrace();
+                    }
+                });
+            }
+
+
+
             request.bodyHandler((Buffer buff) -> {
 
                 if (buff.length()>0) {
@@ -115,29 +152,40 @@ public final class VertxCloudEventsImpl implements VertxCloudEvents {
             request.putHeader(HttpHeaders.CONTENT_LENGTH, HttpHeaders.createOptimized("0"));
         }
 
+        HttpTransportAttributes httpTransportAttributes = HttpTransportAttributes.getHttpAttributesForSpec(SpecVersion.fromVersion(ce.getSepcVersion()));
+
         // read required headers
         request
                 .putHeader(HttpHeaders.CONTENT_TYPE, HttpHeaders.createOptimized("application/json"))
-                .putHeader(HttpHeaders.createOptimized(CLOUD_EVENTS_VERSION_KEY), HttpHeaders.createOptimized(ce.getCloudEventsVersion()))
-                .putHeader(HttpHeaders.createOptimized(EVENT_TYPE_KEY), HttpHeaders.createOptimized(ce.getEventType()))
-                .putHeader(HttpHeaders.createOptimized(SOURCE_KEY), HttpHeaders.createOptimized(ce.getSource().toString()))
-                .putHeader(HttpHeaders.createOptimized(EVENT_ID_KEY), HttpHeaders.createOptimized(ce.getEventID()));
+                .putHeader(HttpHeaders.createOptimized(httpTransportAttributes.specVersionKey()), HttpHeaders.createOptimized(ce.getSepcVersion()))
+                .putHeader(HttpHeaders.createOptimized(httpTransportAttributes.typeKey()), HttpHeaders.createOptimized(ce.getType()))
+                .putHeader(HttpHeaders.createOptimized(httpTransportAttributes.sourceKey()), HttpHeaders.createOptimized(ce.getSource().toString()))
+                .putHeader(HttpHeaders.createOptimized(httpTransportAttributes.idKey()), HttpHeaders.createOptimized(ce.getId()));
 
         // read optional headers
-        ce.getEventTypeVersion().ifPresent(eventTypeVersion -> {
-            request.putHeader(HttpHeaders.createOptimized(EVENT_TYPE_VERSION_KEY), HttpHeaders.createOptimized(eventTypeVersion));
-        });
-
-        ce.getEventTime().ifPresent(eventTime -> {
-            request.putHeader(HttpHeaders.createOptimized(EVENT_TIME_KEY), HttpHeaders.createOptimized(eventTime.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)));
+        ce.getTime().ifPresent(eventTime -> {
+            request.putHeader(HttpHeaders.createOptimized(httpTransportAttributes.timeKey()), HttpHeaders.createOptimized(eventTime.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)));
         });
 
         ce.getSchemaURL().ifPresent(schemaUrl -> {
-            request.putHeader(HttpHeaders.createOptimized(SCHEMA_URL_KEY), HttpHeaders.createOptimized(schemaUrl.toString()));
+            request.putHeader(HttpHeaders.createOptimized(httpTransportAttributes.schemaUrlKey()), HttpHeaders.createOptimized(schemaUrl.toString()));
         });
 
+
+        ce.getExtensions().ifPresent(extensions -> {
+
+            extensions.forEach(ext -> {
+                JsonObject.mapFrom(ext).forEach(extEntry -> {
+                    request.putHeader(HttpHeaders.createOptimized(extEntry.getKey()), HttpHeaders.createOptimized(extEntry.getValue().toString()));
+                });
+            });
+        });
+
+
         ce.getData().ifPresent(data -> {
             request.write(data.toString());
         });
+
+
     }
 }
diff --git a/http/vertx/src/main/java/io/cloudevents/http/vertx/package-info.java b/http/vertx/src/main/java/io/cloudevents/http/vertx/package-info.java
index 1532e4c7..61025c9a 100644
--- a/http/vertx/src/main/java/io/cloudevents/http/vertx/package-info.java
+++ b/http/vertx/src/main/java/io/cloudevents/http/vertx/package-info.java
@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright 2018 The CloudEvents Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/http/vertx/src/test/java/io/cloudevents/http/vertx/VertxCloudEventsTests.java b/http/vertx/src/test/java/io/cloudevents/http/vertx/VertxCloudEventsTests.java
index cdd19f24..3ddb0456 100644
--- a/http/vertx/src/test/java/io/cloudevents/http/vertx/VertxCloudEventsTests.java
+++ b/http/vertx/src/test/java/io/cloudevents/http/vertx/VertxCloudEventsTests.java
@@ -1,4 +1,4 @@
-/*
+/**
  * Copyright 2018 The CloudEvents Authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,6 +17,9 @@ package io.cloudevents.http.vertx;
 
 import io.cloudevents.CloudEvent;
 import io.cloudevents.CloudEventBuilder;
+import io.cloudevents.extensions.DistributedTracingExtension;
+import io.cloudevents.http.V01HttpTransportMappers;
+import io.cloudevents.http.V02HttpTransportMappers;
 import io.cloudevents.http.reactivex.vertx.VertxCloudEvents;
 import io.vertx.core.http.HttpHeaders;
 import io.vertx.junit5.Checkpoint;
@@ -29,10 +32,11 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import java.net.URI;
+import java.util.List;
 import java.util.logging.Logger;
 
-import static io.cloudevents.CloudEvent.CLOUD_EVENTS_VERSION_KEY;
-import static io.cloudevents.CloudEvent.EVENT_TYPE_KEY;
+import static io.cloudevents.SpecVersion.V_01;
+import static io.cloudevents.SpecVersion.V_02;
 import static org.assertj.core.api.Assertions.assertThat;
 
 @ExtendWith(VertxExtension.class)
@@ -41,15 +45,16 @@ class VertxCloudEventsTests {
     private final static Logger logger = Logger.getLogger(VertxCloudEventsTests.class.getName());
 
     @Test
-    @DisplayName("Post a cloud event with a payload")
+    @DisplayName("Post a 0.2 CloudEvents object with a payload")
     void cloudEventWithPayload(Vertx vertx, VertxTestContext testContext) {
         Checkpoint serverCheckpoint = testContext.checkpoint();
         Checkpoint clientCheckpoint = testContext.checkpoint();
 
         CloudEvent<String> cloudEvent = new CloudEventBuilder<String>()
+                .specVersion("0.2")
                 .source(URI.create("http://knative-eventing.com"))
-                .eventID("foo-bar")
-                .eventType("pushevent")
+                .id("foo-bar")
+                .type("pushevent")
                 .data("{\"foo\":\"bar\"}}")
                 .build();
 
@@ -59,9 +64,9 @@ class VertxCloudEventsTests {
                         .rxReadFromRequest(req)
                         .doOnError(testContext::failNow)
                         .subscribe(event -> testContext.verify(() -> {
-                            assertThat(event.getEventID()).isEqualTo(cloudEvent.getEventID());
+                            assertThat(event.getId()).isEqualTo(cloudEvent.getId());
                             assertThat(event.getSource().toString()).isEqualTo(cloudEvent.getSource().toString());
-                            assertThat(event.getEventType()).isEqualTo(cloudEvent.getEventType());
+                            assertThat(event.getType()).isEqualTo(cloudEvent.getType());
                             assertThat(event.getData()).isPresent();
                             req.response().end();
                             serverCheckpoint.flag();
@@ -80,15 +85,16 @@ class VertxCloudEventsTests {
     }
 
     @Test
-    @DisplayName("Post a cloud event without a payload")
+    @DisplayName("Post a 0.2 CloudEvents object without a payload")
     void cloudEventWithoutPayload(Vertx vertx, VertxTestContext testContext) {
         Checkpoint serverCheckpoint = testContext.checkpoint();
         Checkpoint clientCheckpoint = testContext.checkpoint();
 
         CloudEvent<String> cloudEvent = new CloudEventBuilder<String>()
+                .specVersion("0.2")
                 .source(URI.create("http://knative-eventing.com"))
-                .eventID("foo-bar")
-                .eventType("pushevent")
+                .id("foo-bar")
+                .type("pushevent")
                 .build();
 
         vertx.createHttpServer()
@@ -97,9 +103,65 @@ class VertxCloudEventsTests {
                         .rxReadFromRequest(req)
                         .doOnError(testContext::failNow)
                         .subscribe(event -> testContext.verify(() -> {
-                            assertThat(event.getEventID()).isEqualTo(cloudEvent.getEventID());
+
+                            // check headers
+                            assertThat(req.headers().get(V02HttpTransportMappers.SPEC_VERSION_KEY)).isEqualTo(V_02.toString());
+                            assertThat(req.headers().get(V01HttpTransportMappers.SPEC_VERSION_KEY)).isNull();
+                            assertThat(req.headers().get("ce-id")).isEqualTo("foo-bar");
+                            assertThat(req.headers().get("ce-eventID")).isNull();
+
+                            // check parsed object
+                            assertThat(event.getId()).isEqualTo(cloudEvent.getId());
                             assertThat(event.getSource().toString()).isEqualTo(cloudEvent.getSource().toString());
-                            assertThat(event.getEventType()).isEqualTo(cloudEvent.getEventType());
+                            assertThat(event.getType()).isEqualTo(cloudEvent.getType());
+                            assertThat(event.getData()).isNotPresent();
+                            req.response().end();
+                            serverCheckpoint.flag();
+                        })))
+                .rxListen(8080)
+                .doOnError(testContext::failNow)
+                .subscribe(server -> {
+                    HttpClientRequest req = vertx.createHttpClient().post(server.actualPort(), "localhost", "/");
+                    req.handler(resp -> testContext.verify(() -> {
+                        assertThat(resp.statusCode()).isEqualTo(200);
+                        clientCheckpoint.flag();
+                    }));
+                    VertxCloudEvents.create().writeToHttpClientRequest(cloudEvent, req);
+                    req.end();
+                });
+    }
+
+    @Test
+    @DisplayName("Post a 0.1 CloudEvents object without a payload")
+    void cloudEventWithoutPayload01(Vertx vertx, VertxTestContext testContext) {
+        Checkpoint serverCheckpoint = testContext.checkpoint();
+        Checkpoint clientCheckpoint = testContext.checkpoint();
+
+        CloudEvent<String> cloudEvent = new CloudEventBuilder<String>()
+                .specVersion("0.1")
+                .source(URI.create("http://knative-eventing.com"))
+                .id("foo-bar")
+                .type("pushevent")
+                .build();
+
+        vertx.createHttpServer()
+                .requestHandler(req -> VertxCloudEvents
+                        .create()
+                        .rxReadFromRequest(req)
+                        .doOnError(testContext::failNow)
+                        .subscribe(event -> testContext.verify(() -> {
+
+                            // check headers
+                            assertThat(req.headers().get(V01HttpTransportMappers.SPEC_VERSION_KEY)).isEqualTo(V_01.toString());
+                            assertThat(req.headers().get(V02HttpTransportMappers.SPEC_VERSION_KEY)).isNull();
+                            assertThat(req.headers().get("ce-eventID")).isEqualTo("foo-bar");
+                            assertThat(req.headers().get("ce-id")).isNull();
+
+                            // check parsed object
+                            assertThat(event.getId()).isEqualTo(cloudEvent.getId());
+                            assertThat(event.getSepcVersion().toString()).isEqualTo(cloudEvent.getSepcVersion());
+                            assertThat(event.getSource().toString()).isEqualTo(cloudEvent.getSource().toString());
+                            assertThat(event.getType()).isEqualTo(cloudEvent.getType());
                             assertThat(event.getData()).isNotPresent();
                             req.response().end();
                             serverCheckpoint.flag();
@@ -140,8 +202,9 @@ class VertxCloudEventsTests {
                 .subscribe(server -> {
                     HttpClientRequest req = vertx.createHttpClient().post(server.actualPort(), "localhost", "/");
                     // create incomplete CloudEvent request
-                    req.putHeader(HttpHeaders.createOptimized(CLOUD_EVENTS_VERSION_KEY), HttpHeaders.createOptimized("0.1"));
-                    req.putHeader(HttpHeaders.createOptimized(EVENT_TYPE_KEY), HttpHeaders.createOptimized("pushevent"));
+                    req.putHeader(HttpHeaders.createOptimized("ce-specversion"), HttpHeaders.createOptimized("0.2"));
+                    req.putHeader(HttpHeaders.createOptimized("ce-type"), HttpHeaders.createOptimized("pushevent"));
+                    req.putHeader(HttpHeaders.createOptimized("foo"), HttpHeaders.createOptimized("bar"));
                     req.putHeader(HttpHeaders.CONTENT_LENGTH, HttpHeaders.createOptimized("0"));
                     req.handler(resp -> testContext.verify(() -> {
                         assertThat(resp.statusCode()).isEqualTo(200);
@@ -150,4 +213,59 @@ class VertxCloudEventsTests {
                     req.end();
                 });
     }
+
+    @Test
+    @DisplayName("Post a 0.2 CloudEvents object with a payload")
+    void cloudEventWithExtension(Vertx vertx, VertxTestContext testContext) {
+        Checkpoint serverCheckpoint = testContext.checkpoint();
+        Checkpoint clientCheckpoint = testContext.checkpoint();
+
+        final DistributedTracingExtension dte = new DistributedTracingExtension();
+        dte.setTraceparent("00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01");
+        dte.setTracestate("congo=BleGNlZWRzIHRohbCBwbGVhc3VyZS4");
+
+
+        final CloudEvent<String> cloudEvent = new CloudEventBuilder<String>()
+                .specVersion("0.2")
+                .source(URI.create("http://knative-eventing.com"))
+                .id("foo-bar")
+                .extension(dte)
+                .type("pushevent")
+                .build();
+
+        Class[] exceptions =  {DistributedTracingExtension.class};
+
+        vertx.createHttpServer()
+                .requestHandler(req -> VertxCloudEvents
+                        .create()
+                        .rxReadFromRequest(req, exceptions)
+                        .doOnError(testContext::failNow)
+                        .subscribe(event -> testContext.verify(() -> {
+                            assertThat(event.getId()).isEqualTo(cloudEvent.getId());
+
+                            // extension headers
+                            assertThat(req.headers().get("traceparent")).isEqualTo("00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01");
+                            assertThat(req.headers().get("tracestate")).isEqualTo("congo=BleGNlZWRzIHRohbCBwbGVhc3VyZS4");
+
+                            assertThat(event.getExtensions().get().get(0)).isNotNull();
+
+                            assertThat(event.getExtensions().get().get(0)).extracting("traceparent", "tracestate")
+                                    .contains("00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01", "congo=BleGNlZWRzIHRohbCBwbGVhc3VyZS4");
+
+
+                            req.response().end();
+                            serverCheckpoint.flag();
+                        })))
+                .rxListen(8080)
+                .doOnError(testContext::failNow)
+                .subscribe(server -> {
+                    HttpClientRequest req = vertx.createHttpClient().post(server.actualPort(), "localhost", "/");
+                    req.handler(resp -> testContext.verify(() -> {
+                        assertThat(resp.statusCode()).isEqualTo(200);
+                        clientCheckpoint.flag();
+                    }));
+                    VertxCloudEvents.create().writeToHttpClientRequest(cloudEvent, req);
+                    req.end();
+                });
+    }
 }