I was facing the same issue where I had a java client send a request
with custom headers set to JAVA_UPLOAD_FILENAME and similar which should
be forwarded to a backend server via proxy_pass. Non of the custom
headers arrived at the backend.
However when changing the headers to Java-Upload-Filename etc they
arrived just fine at the backend server.

Hope this helps someone...

Best, Daniel
--
Posted via http://www.ruby-forum.com/.