HTTP header size problem

We have been using weblogic to serve the jnlp for a while now (there is a servlet that generates jnlp and sends to client) without any problems. Yesterday the following error occurred for the first time and the server stopped working. Does anyone have a clue as to in which situation can the header size exceed this limit? After restarting the server, it started working properly again.
weblogic.socket.MaxMessageSizeExceededException: [Incoming HTTP request headers of size 4129 bytes exceeds the configured maximum of 4096 bytes]
at weblogic.socket.MuxableSocketHTTP.incrementBufferOffset(MuxableSocketHTTP.java:111)
at weblogic.socket.JavaSocketMuxer.processSockets(JavaSocketMuxer.java:245)
Thanks.

My first reaction was that if you are using version protocol, and if you had many versions of some resources in the cache, maybe the request from java web start kept growing with each version.
http://xxx.com/yyy/zzz.jar version="1.9"&current_version="1.1"&current_version="1.2"&current_version="1.3"...
but in that case can't see how restarting the server would help.
/Dietz

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