mirror of https://github.com/knative/pkg.git
36 lines
1.1 KiB
Go
36 lines
1.1 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package websocket
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import (
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"bufio"
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"fmt"
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"net"
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"net/http"
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)
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// HijackIfPossible calls Hijack() on the given http.ResponseWriter if it implements
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// http.Hijacker interface, which is required for net/http/httputil/reverseproxy
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// to handle connection upgrade/switching protocol. Otherwise returns an error.
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func HijackIfPossible(w http.ResponseWriter) (net.Conn, *bufio.ReadWriter, error) {
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hj, ok := w.(http.Hijacker)
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if !ok {
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return nil, nil, fmt.Errorf("wrapped writer of type %T can't be hijacked", w)
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}
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return hj.Hijack()
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}
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