[jetty-users] Warning from ProxyServlet

[Mark Payne <mark.payne@xxxxxxxxxxx>]

I have a ProxyServlet.Transparent set up within a Jetty server to 
forward URLs ending "/sparql" to another web server that hosts a 
knowledge base.

context.addServlet(new ServletHolder(new ProxyServlet.Transparent(
               "/sparql", repositoryServerHost, repositoryServerPort)), 
"/sparql/*");

Normally the proxying works fine, but intermittently I send a request 
and it causes:

1. Jetty to log a warning - WARN 
[org.eclipse.jetty.servlets.ProxyServlet$Transparent-30476892-30] 
(Slf4jLog.java:40) - Unexpected data received but no request sent

2. My HTTP client to hang waiting for a response

3. My underlying server to log that it has received and processed a request.

Looking through the source xref  I found that the warning message comes 
from handle() in org.eclipse.jetty.client.HttpConnection, and gets 
logged if it is discovered that a response contains data while _exchange 
is null.

Any suggestions why this might be happening? It seems that somewhere the 
reference to _exchange is not getting set properly, because clearly a 
request _is_ being sent. Unfortunately I can't see a clear link between 
the type of request that I send and the appearance of the warning. Let 
me know if this would be better directed to the dev mailing list or a 
bug report.

Thanks,

Mark Payne