synth3 created HTTPCLIENT-2120:
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Summary: 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: Bug
Components: HttpClient (async)
Affects Versions: 5.0.3
Reporter: synth3
*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.tsystems.push2mobile.transport.apple.MinimalProxyTest.basicTest(MinimalProxyTest.java:41)
at
com.tsystems.push2mobile.transport.apple.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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