Request-Response large connection size

[elfenpiff]

When using request-response, the internal connection between the servers and clients requires a lot of memory. It is not yet clear if this is a bug or that the worst case assumptions somehow pile up here and cause this memory overhead.

It can already be observed in the simple request-response example from the repository. See:

52k    iox2_0354a209029e7d094a819e2d4030ea331e6caaf0_90711141441948140518990960335.data
1.2k   iox2_0354a209029e7d094a819e2d4030ea331e6caaf0_91328914599941840254787409767.data
1.7k   iox2_305ad9523c6b202364d581359ec3d2c5743e42e7_be37df3dea2dab734fe80c6e2ca532b0a6f34ec6.dynamic
19k    iox2_b9fc73e5c1f646968758453273c6c65cb372831b_90711141441948140518990960335_91328914599941840254787409767.connection
374    iox2_b9fc73e5c1f646968758453273c6c65cb372831b_91328914599941840254787409767_90711141441948140518990960335.connection

Where one connection has a size of 19k while the other has just 374 bytes

So the task is:

1. Find out if it is the connection from client to server (for requests) or from server to client (for responses).
2. Explore what is causing the issue on this large connection size.
3. Fix it - if possible