Http2 calls against go server failing

[a-k-g]

What happened?

We use a conjure client to talk to a Go server. This call was working fine with Java 8. On upgrading to Java 11 on client side the call started failing with the following error:

INFO com.palantir.conjure.java.okhttp.RemotingOkHttpCall - Retrying call after failure
    okhttp3.internal.http2.StreamResetException: stream was reset: PROTOCOL_ERROR
        at okhttp3.internal.http2.Http2Stream.takeHeaders(Http2Stream.java:156)
        at okhttp3.internal.http2.Http2Codec.readResponseHeaders(Http2Codec.java:137)
        at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:101)

It was suggested that this could be because of the server advertising Http2 compatibility and then conjure-java-runtime tries to use it when on Java11+. Disabling http2 on the server side fixed the issue.

What did you want to happen?

Http2 connections against Go servers should just work.

[carterkozak]

Are gcm ciphers enabled in your configuration?

[a-k-g]

We don't explicitly enable them. We use the default, which suggests enableGcmCipherSuites will be set to false.