is it a WIP or you was unable to fix it for AHC5?

I addressed this problem because my colleague at JetBrains stuck into the situation where our Python helper script misbehaved. And we use only OkHttp implementation.

However I dived into AHC5 implementation. It has pretty similar UnixDomainSocket class. But fixing only this class does not help because org.apache.hc.core5.http.impl.io.ContentLengthOutputStream.close() does not call close() method on underlying outputStream (which belongs to UnixDomainSocket that could be fixed) and, unfortunately,ContentLengthOutputStream class is situated in org.apache.httpcomponents.core5:httpcore5:5.0 artifact.

Here is the stacktrace where magic does not happen:

"docker-java-httpclient5-hijacking-stream-1739943297@6989" daemon prio=5 tid=0x3d nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	  at org.apache.hc.core5.http.impl.io.ContentLengthOutputStream.close(ContentLengthOutputStream.java:92)
	  at org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnection.sendRequestEntity(DefaultBHttpClientConnection.java:154)
	  at com.github.dockerjava.httpclient5.HijackingHttpRequestExecutor.lambda$executeHijacked$0(HijackingHttpRequestExecutor.java:82)
	  at com.github.dockerjava.httpclient5.HijackingHttpRequestExecutor$$Lambda$233.1769119455.run(Unknown Source:-1)
	  at java.lang.Thread.run(Thread.java:834)

I have investigated the problem in AHC5 implementation. Although the org.apache.hc.core5.http.impl.io.ContentLengthOutputStream.close() method does not close the underlying OutputStream, it is possible to shut down the OutputStream in com.github.dockerjava.httpclient5.HijackingHttpRequestExecutor class right after conn.sendRequestEntity(fakeRequest); call:

if (conn instanceof ManagedHttpClientConnection) {
    ((ManagedHttpClientConnection) conn).getSocket().shutdownOutput();
}

However, for that to work, similar changes to the UnixDomainSocket class (under docker-java-transport-httpclient5) are needed because, by default, UnixDomainSocket.shutdownOutput() does nothing.

@mrtamm thanks for investigating, this is very helpful!

@tejksat will you be able to apply the changes as per @mrtamm's advice?

@@tejksat gentle ping :)