This allows custom distributions of the agent to register
`HttpServerResponseCustomizer` implementations. When a supported HTTP
server instrumentation starts processing a response, the `onStart`
method of all registered implementations will be invoked with the
`Context` of the SERVER span, an instrumentation-specific response
object and `HttpServerResponseMutator` instance that allows appending
headers to that response.
The intent of this is to allow custom distributions to set a header
containing span context information, such as the trace and span IDs. As
such, the initial implementation only allows appending response headers
and nothing else.
The `HttpServerResponseCustomizer` and related classes are currently in
a subpackage of the `io.opentelemetry.javaagent.bootstrap` package in
`javaagent-extension-api`. This makes them get loaded in the bootstrap
classloader, thus directly accessible from instrumentations. I am not
aware if there is an elegant way to put it in the agent classloader
instead, yet have the same instance accessible from both
`AgentInstaller` and instrumentations.
This also includes Tomcat-specific implementation in order to be able to
demonstrate that it works, and add automated testing of this to
HttpServerTest including one implementation.
Bumps
[com.linecorp.armeria:armeria-junit5](https://github.com/line/armeria)
from 1.21.0 to 1.22.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/line/armeria/releases">com.linecorp.armeria:armeria-junit5's
releases</a>.</em></p>
<blockquote>
<h2>armeria-1.22.0</h2>
<p>See <a href="https://armeria.dev/release-notes/1.22.0/">the release
notes</a> for the complete change list.</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="c1fca3092b"><code>c1fca30</code></a>
Release armeria-1.22.0</li>
<li><a
href="904aee7e08"><code>904aee7</code></a>
Add release notes for 1.22.0 (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4656">#4656</a>)</li>
<li><a
href="a43cfa2204"><code>a43cfa2</code></a>
Return "431 Request Header Fields Too Large" for long headers
on HTTP/1 (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4655">#4655</a>)</li>
<li><a
href="e971022cc0"><code>e971022</code></a>
Fix a bug where duplicate parameters are shown in DocService (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4645">#4645</a>)</li>
<li><a
href="3713d52f39"><code>3713d52</code></a>
Fix a bug where <code>ClosedSessionException</code> is set to
<code>responseCause</code> for a succ...</li>
<li><a
href="bfc1924444"><code>bfc1924</code></a>
Use gRPC StatusRuntimeException instead of StatusException. (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4658">#4658</a>)</li>
<li><a
href="c11b7abf74"><code>c11b7ab</code></a>
Upgrade dependencies for 1.22.0 (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4653">#4653</a>)</li>
<li><a
href="c2cadb8c80"><code>c2cadb8</code></a>
Fix a <code>NullPointerException</code> raised while an aborted
<code>FixedStreamMessage</code> is ...</li>
<li><a
href="c6013672ac"><code>c601367</code></a>
Add <code>AsyncServerInterceptor</code> for gRPC services (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4647">#4647</a>)</li>
<li><a
href="36164e279f"><code>36164e2</code></a>
Support Thrift TypeDef in DocService (<a
href="https://github-redirect.dependabot.com/line/armeria/issues/4628">#4628</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/line/armeria/compare/armeria-1.21.0...armeria-1.22.0">compare
view</a></li>
</ul>
</details>
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