Cenk Pekyaman created HTTPCLIENT-2386:
-----------------------------------------
Summary: httpClient5 socketTimeoutException in dataChannel with
connectTimeout value
Key: HTTPCLIENT-2386
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2386
Project: HttpComponents HttpClient
Issue Type: Improvement
Components: HttpClient (async)
Affects Versions: 5.4.4
Environment: httpclient5 version: 5.4.4
httpCore5 version: 5.3.4
Java version: 17 (21 since recently)
Reporter: Cenk Pekyaman
We are using http-client-5 under our api-client layer with async + TLS. Once in
a while, we get a timeout exception like this:
"{*}java.net.SocketTimeoutException: 2 SECONDS{*}" in some requests. and from
the stack trace, we see that the exception is coming from
"InternalDataChannel.onTimeout". but the value we see is actually the
{*}connectTimeout{*}, not the readTimeout({*}socketTimeout{*}) we set for the
request.
we specify our *connectTimeout* as *2 seconds* in
*PoolingAsyncClientConnectionManagerBuilder* during client creation. we specify
our *socketTimeout* as *10 seconds* in *RequestConfig* of *HttpClientContext*
during request execution.
this is how we make the call (a bit simplified):
```
// the last parameter is our class implementing FutureCallback
Future<Message<HttpResponse, RES>> clientFuture =
asyncHttpClient.execute(asyncRequestProducer, responseConsumer, null,
httpClientContext, this);
// callTimeout is essentially connectTimeout + socketTimeout by default. return
clientFuture.get(callTimeout, TimeUnit.MILLISECONDS);
```
We suspect that the client completes the initial connect step with
"InternalConnectChannel" and then the socket is handed over to
"InternalDataChannel" to do the TLS handshake in "{*}startTls{*}", which either
takes too long to complete, or hangs.
Since we don't specify handshakeTimeout in our tlsconfig,
*DefaultAsyncClientConnectionOperator* seems to be using *connectTimeout* for
this stage (in the callback called after connection is established ?).
Code flow is essentially correct but getting a generic socketTimeoutException
with the value of connectTimeout seems a bit confusing, as we normally expect
some ConnectTimeoutException if we really have a connection timeout, or the
other way around.
This is an example stack trace for such a case:
```
at org.apache.hc.core5.concurrent.BasicFuture.failed(BasicFuture.java:166)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.ComplexFuture.failed(ComplexFuture.java:79)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.client5.http.impl.async.InternalAbstractHttpAsyncClient$2.failed(InternalAbstractHttpAsyncClient.java:364)
[httpclient5-5.4.4.jar:5.4.4] at
org.apache.hc.client5.http.impl.async.AsyncRedirectExec$1.failed(AsyncRedirectExec.java:246)
[httpclient5-5.4.4.jar:5.4.4] at
org.apache.hc.client5.http.impl.async.AsyncProtocolExec$1.failed(AsyncProtocolExec.java:295)
[httpclient5-5.4.4.jar:5.4.4] at
org.apache.hc.client5.http.impl.async.AsyncConnectExec$2.failed(AsyncConnectExec.java:233)
[httpclient5-5.4.4.jar:5.4.4] at
org.apache.hc.core5.concurrent.CallbackContribution.failed(CallbackContribution.java:52)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.BasicFuture.failed(BasicFuture.java:166)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.ComplexFuture.failed(ComplexFuture.java:79)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager$4.failed(PoolingAsyncClientConnectionManager.java:482)
[httpclient5-5.4.4.jar:5.4.4] at
org.apache.hc.core5.concurrent.BasicFuture.failed(BasicFuture.java:166)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.ComplexFuture.failed(ComplexFuture.java:79)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.FutureContribution.failed(FutureContribution.java:52)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.concurrent.CallbackContribution.failed(CallbackContribution.java:52)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.ssl.SSLIOSession$1.exception(SSLIOSession.java:233)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.ssl.SSLIOSession$1.timeout(SSLIOSession.java:223)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.InternalDataChannel.onTimeout(InternalDataChannel.java:170)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.InternalChannel.checkTimeout(InternalChannel.java:67)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.SingleCoreIOReactor.checkTimeout(SingleCoreIOReactor.java:239)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.SingleCoreIOReactor.validateActiveChannels(SingleCoreIOReactor.java:166)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.SingleCoreIOReactor.doExecute(SingleCoreIOReactor.java:128)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.AbstractSingleCoreIOReactor.execute(AbstractSingleCoreIOReactor.java:92)
[httpcore5-5.3.4.jar:5.3.4] at
org.apache.hc.core5.reactor.IOReactorWorker.run(IOReactorWorker.java:44)
[httpcore5-5.3.4.jar:5.3.4] at java.lang.Thread.run(Thread.java:840) [?:?]
Caused by: java.net.SocketTimeoutException: 2 SECONDS at
org.apache.hc.core5.io.SocketTimeoutExceptionFactory.create(SocketTimeoutExceptionFactory.java:50)
~[httpcore5-5.3.4.jar:5.3.4]
```
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