I managed to identify the problem:
the first request I sent was a GET request with null body. in the class
org.apache.camel.component.netty4.http.NettyHttpProducer - the method
getRequestBody(Exchange exchange) is creating the actual request object from
the exchange. in it - the method "toNettyRequest" in class
org.apache.camel.component.netty4.http.DefaultNettyHttpBinding checks if the
body is null, and if so - it is creating a DefaultHttpRequest, and not
DefaultHttpFullRequest
when the request reaches the encoder as a result of a writeAndFlush call -
the encoder does not clean its state because of this part of the code:
if (msg instanceof LastHttpContent) {
state = ST_INIT;
}
the DefaultHttpRequest is not instanceof LastHttpContent, so the state
remains ST_CONTENT_NON_CHUNK and the next request will get an
IllegalStateException because the state is not ST_INIT
this bug did not exist in netty-http, it only happened when I moved to use
netty4-http
the workaround is simple - use an empty String ("") as body
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