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https://issues.apache.org/jira/browse/HTTPCLIENT-2120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17412561#comment-17412561
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ASF subversion and git services commented on HTTPCLIENT-2120:
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Commit 92f757eee3e9f8f964b3cdbe6e878daf75e989f6 in httpcomponents-client's
branch refs/heads/master from Oleg Kalnichevski
[ https://gitbox.apache.org/repos/asf?p=httpcomponents-client.git;h=92f757e ]
HTTPCLIENT-2120: support for H2 via HTTP/1.1 proxy
> Support HTTP/2 (TLS) Tunneling over HTTP-Proxy
> ----------------------------------------------
>
> Key: HTTPCLIENT-2120
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2120
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (async)
> Affects Versions: 5.0.3
> Reporter: synth3
> Priority: Major
> Labels: http2, proxy
> Fix For: 5.2-alpha1
>
> Attachments: hc5_session.log
>
>
> *First of all:*
> * Are there plans for supporting HTTP/2 (with TLS) connections via corporate
> HTTP-proxies?
> ** If yes: is there a schedule?
> * Could you please add documentation to "https://hc.apache.org"; that makes
> it clear that the HTTP/2 implementation does currently not support
> HTTP-proxies?
> ** This alone could save people hours of programming something that has no
> chance to work and debugging afterwards
> ** The only clear statement I found regarding that topic was at a migration
> guide
> ("https://ok2c.github.io/httpclient-migration-guide/migration-to-async-http2.html";)
> *Observations while trying to establish a HTTP/2 connection via proxy:*
> The observations can be made using the following minimal example with
> {{[proxy_ip]:[proxy_port]}} replaced with host and port of an actual
> HTTP-Proxy:
> {code:java}
> CloseableHttpAsyncClient client = HttpAsyncClients.custom()
> .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
> .setProxy(HttpHost.create("[proxy_ip]:[proxy_port]")).build();
> client.start();
> // throws org.apache.hc.core5.http.ConnectionClosedException
> client.execute(SimpleHttpRequests.get("https://http2.pro/client";),
> null).get();
> {code}
> The above code throws the following Exception:
> {code:java}
> Exception in thread "main" java.util.concurrent.ExecutionException:
> org.apache.hc.core5.http.ConnectionClosedException: Connection is closed
> at
> org.apache.hc.core5.concurrent.BasicFuture.getResult(BasicFuture.java:72)
> at org.apache.hc.core5.concurrent.BasicFuture.get(BasicFuture.java:85)
> at com.test.MinimalProxyTest.basicTest(MinimalProxyTest.java:41)
> at com.test.MinimalProxyTest.main(MinimalProxyTest.java:23)
> Caused by: org.apache.hc.core5.http.ConnectionClosedException: Connection is
> closed
> at
> org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.onException(AbstractH2StreamMultiplexer.java:661)
> at
> org.apache.hc.core5.http2.impl.nio.AbstractH2IOEventHandler.exception(AbstractH2IOEventHandler.java:91)
> at
> org.apache.hc.core5.http2.impl.nio.ClientH2IOEventHandler.exception(ClientH2IOEventHandler.java:39)
> at
> org.apache.hc.core5.reactor.InternalDataChannel.onException(InternalDataChannel.java:162)
> at
> org.apache.hc.core5.reactor.InternalChannel.handleIOEvent(InternalChannel.java:55)
> at
> org.apache.hc.core5.reactor.SingleCoreIOReactor.processEvents(SingleCoreIOReactor.java:179)
> at
> org.apache.hc.core5.reactor.SingleCoreIOReactor.doExecute(SingleCoreIOReactor.java:128)
> at
> org.apache.hc.core5.reactor.AbstractSingleCoreIOReactor.execute(AbstractSingleCoreIOReactor.java:85)
> at
> org.apache.hc.core5.reactor.IOReactorWorker.run(IOReactorWorker.java:44)
> at java.base/java.lang.Thread.run(Thread.java:832)
> {code}
> * There is no exception thrown that makes clear that this constellation
> (HTTP/2 + Proxy) is not supported
> ** Even though I found
> {{org.apache.hc.client5.http.impl.async.InternalHttpAsyncClient.determineRoute(HttpHost,
> HttpClientContext)}} with {{throw new HttpException("HTTP/2 tunneling not
> supported")}} which is not triggered because
> {{HttpClientContext.getProtocolVersion()}} returns {{HTTP-1.1}}
> * Looking at the Logs I see that the HTTP/2 request was tried to be
> performed unencrypted and the Proxy sends {{HTTP/1.0 400 Bad Request}} and
> closes the connection
> * Also in the logs I can see {{Code FRAME_SIZE_ERROR}} and {{Frame size
> exceeds maximum}} which might be caused by trying to consume the HTTP-1.1
> proxy response as HTTP/2
> ** The associated Exception ({{H2ConnectionException: Frame size exceeds
> maximum}}) is omitted in
> {{org.apache.hc.core5.http2.impl.nio.AbstractH2StreamMultiplexer.onException(Exception)}}
> where {{((ExecutableCommand) command).failed(new
> ConnectionClosedException())}} is called
> *What can be done?*
> If I wanted to support you in implementing the HTTP/2 via proxy support where
> would I have to start?
> * When I understand the situation right then we are almost there and the
> only problem is that the HTTP/2 request is tried to be performed without
> encryption
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