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https://issues.apache.org/jira/browse/HTTPCLIENT-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415678#comment-17415678
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Andrei Vasilev edited comment on HTTPCLIENT-2177 at 9/15/21, 6:33 PM:
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Oleg,
After reading around, I tend to agree and I am not sure why the Connection:
close header is sent. However, I tried this with 4 separate proxies / proxy
providers and the behavior was the same for all of them. They were :
* Fiddler (local proxy server, only supports HTTP/1.1)
* Packet Stream (paid service, supports HTTP/2)
* Web Share (free tier of a paid service, supports HTTP/2)
* Free-Proxy-List (free proxy, unknown support)
I suppose it could be coincidence, but is it possible something else is leading
the proxy servers to be inclined to close the connection like this? My
apologies but I am not well versed enough in the HTTP protocol to provide any
insight myself. For what its worth, I have tested these against the OkHttp
client as well, and they all worked as expected, but maybe this is irrelevant
since I believe OkHttp supports HTTP/2 tunneling via HTTP/1.1 proxies.
In any case, thank you for your help. It is much appreciated.
was (Author: avasilev):
Oleg,
After reading around, I tend to agree and I am not sure why the Connection:
close header is sent. However, I tried this with 4 separate proxies / proxy
providers and the behavior was the same for all of them. They were :
* Fiddler (local proxy server)
* Packet Stream (paid service)
* Web Share (free tier of a paid service)
* Free-Proxy-List (free proxy)
I suppose it could be coincidence, but is it possible something else is leading
the proxy servers to be inclined to close the connection like this? My
apologies but I am not well versed enough in the HTTP protocol to provide any
insight myself.
In any case, thank you for your help. It is much appreciated.
> Unable to use HTTP Proxy with CloseableHttpAsyncClient
> ------------------------------------------------------
>
> Key: HTTPCLIENT-2177
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2177
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpClient (async)
> Affects Versions: 5.0, 5.1
> Environment: Windows 10.0.19041 Build 19041
> Java 11.0.11
> Gradle 6.8
> Reporter: Andrei Vasilev
> Priority: Minor
> Fix For: 5.1.1, 5.2-alpha1
>
> Attachments: context-wire.log
>
>
> When executing a standard GET request with a configured proxy (authenticated
> or not) using an instance of CloseableHttpAsyncClient, the request fails with
> "IllegalStateException: No tunnel unless connected."
> Is making requests via proxies using an AsyncClient not supported? It is not
> entirely clear from the current release notes/examples.
> Minimal example to reproduce issue, although you will of course need to
> configure the proxy accordingly given your environment.
>
> {code:java}
> import java.util.concurrent.Future;
> import javax.net.ssl.SSLEngine;
> import javax.net.ssl.SSLSession;
> import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
> import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
> import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
> import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
> import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
> import org.apache.hc.client5.http.config.RequestConfig;
> import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
> import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
> import
> org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
> import
> org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
> import org.apache.hc.client5.http.protocol.HttpClientContext;
> import org.apache.hc.client5.http.ssl.ClientTlsStrategyBuilder;
> import org.apache.hc.core5.concurrent.FutureCallback;
> import org.apache.hc.core5.function.Factory;
> import org.apache.hc.core5.http.HttpHost;
> import org.apache.hc.core5.http.message.StatusLine;
> import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
> import org.apache.hc.core5.http2.HttpVersionPolicy;
> import org.apache.hc.core5.io.CloseMode;
> import org.apache.hc.core5.reactor.ssl.TlsDetails;
> public class AsyncMain {
> public static void main(final String[] args) throws Exception {
> final TlsStrategy tlsStrategy = ClientTlsStrategyBuilder.create()
> .useSystemProperties()
> .setTlsDetailsFactory(new Factory<SSLEngine, TlsDetails>() {
> @Override
> public TlsDetails create(final SSLEngine sslEngine) {
> return new TlsDetails(sslEngine.getSession(),
> sslEngine.getApplicationProtocol());
> }
> }).build();
> final PoolingAsyncClientConnectionManager cm =
> PoolingAsyncClientConnectionManagerBuilder.create()
> .setTlsStrategy(tlsStrategy)
> .build();
> try (final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
> .setVersionPolicy(HttpVersionPolicy.NEGOTIATE)
> .setConnectionManager(cm)
> .build()) {
> client.start();
> final HttpClientContext clientContext = HttpClientContext.create();
> final HttpHost target = new HttpHost("https", "nghttp2.org");
> final HttpHost proxy = new HttpHost("127.0.0.1", 8888);
> final RequestConfig config =
> RequestConfig.custom().setProxy(proxy).build();
> final SimpleHttpRequest request = SimpleRequestBuilder.get()
> .setHttpHost(target)
> .setRequestConfig(config)
> .setPath("/httpbin/")
> .build();
> System.out.println("Executing request " + request);
> final Future<SimpleHttpResponse> future = client.execute(
> SimpleRequestProducer.create(request),
> SimpleResponseConsumer.create(),
> clientContext,
> new FutureCallback<SimpleHttpResponse>() {
> @Override
> public void completed(final SimpleHttpResponse response) {
> System.out.println(request + "->" + new StatusLine(response));
> final SSLSession sslSession = clientContext.getSSLSession();
> if (sslSession != null) {
> System.out.println("SSL protocol " +
> sslSession.getProtocol());
> System.out.println("SSL cipher suite " +
> sslSession.getCipherSuite());
> }
> System.out.println(response.getBody());
> }
> @Override
> public void failed(final Exception ex) {
> System.out.println(request + "->" + ex);
> }
> @Override
> public void cancelled() {
> System.out.println(request + " cancelled");
> }
> });
> future.get();
> System.out.println("Shutting down");
> client.close(CloseMode.GRACEFUL);
> }
> }
> }
> {code}
>
> The resulting stack trace :
> {code:java}
> Exception in thread "main" java.util.concurrent.ExecutionException:
> java.lang.IllegalStateException: No tunnel unless connected at
> org.apache.hc.core5.concurrent.BasicFuture.getResult(BasicFuture.java:72) at
> org.apache.hc.core5.concurrent.BasicFuture.get(BasicFuture.java:85) at
> AsyncMain.main(AsyncMain.java:86)Caused by: java.lang.IllegalStateException:
> No tunnel unless connected at
> org.apache.hc.core5.util.Asserts.check(Asserts.java:38) at
> org.apache.hc.client5.http.RouteTracker.tunnelTarget(RouteTracker.java:143)
> at
> org.apache.hc.client5.http.impl.async.AsyncConnectExec$4.completed(AsyncConnectExec.java:270)
> at
> org.apache.hc.client5.http.impl.async.AsyncConnectExec$5.completed(AsyncConnectExec.java:388)
> at
> org.apache.hc.client5.http.impl.async.HttpAsyncMainClientExec$1.consumeResponse(HttpAsyncMainClientExec.java:206)
> at
> org.apache.hc.core5.http.impl.nio.ClientHttp1StreamHandler.consumeHeader(ClientHttp1StreamHandler.java:253)
> at
> org.apache.hc.core5.http.impl.nio.ClientHttp1StreamDuplexer.consumeHeader(ClientHttp1StreamDuplexer.java:348)
> at
> org.apache.hc.core5.http.impl.nio.ClientHttp1StreamDuplexer.consumeHeader(ClientHttp1StreamDuplexer.java:80)Caused
> by: java.lang.IllegalStateException: No tunnel unless connected
> at
> org.apache.hc.core5.http.impl.nio.AbstractHttp1StreamDuplexer.onInput(AbstractHttp1StreamDuplexer.java:288)
> at
> org.apache.hc.core5.http.impl.nio.AbstractHttp1IOEventHandler.inputReady(AbstractHttp1IOEventHandler.java:64)
> at
> org.apache.hc.core5.http.impl.nio.ClientHttp1IOEventHandler.inputReady(ClientHttp1IOEventHandler.java:39)
> at
> org.apache.hc.core5.reactor.InternalDataChannel.onIOEvent(InternalDataChannel.java:131)
> at
> org.apache.hc.core5.reactor.InternalChannel.handleIOEvent(InternalChannel.java:51)
> at
> org.apache.hc.core5.reactor.SingleCoreIOReactor.processEvents(SingleCoreIOReactor.java:178)
> at
> org.apache.hc.core5.reactor.SingleCoreIOReactor.doExecute(SingleCoreIOReactor.java:127)
> 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:829)
> {code}
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