Intercept all outgoing http calls

Question

Similar to HttpFilter  (javax.Servlet.Filter ) which when added in web.xml can intercept any incoming request to JVM / outgoing (as response) independent of framework ( Spring/CXF/Jersy etc ) without any code changes (excluding the filter itself), I am trying to find an API or approach which could intercept any outgoing HTTP calls from JVM to add/modify headers independent of framework.
Quite often the word Outgoing HTTP call is misinterpreted in the forums so let me explain with example.
Let us assume there are two JVMs, jvm1 and jvm2. and there are HTTP calls being made from JVM1 to JVM2. I would like to intercept the HTTP connection being made from JVM1 to modify the headers information before the call happens. I do not want the code to be tied to a specific framework so that I can as bundle the interceptor as a jar and share it with application team. Changes in web.xml is fine.
Any suggestions? Please HELP!

Answer 1

> without any code changes...add/modify headers independent of framework.
I doubt that is possible.
Only way I can think of this being technically possible it to replace the VM socket factory with a custom factory which is just a wrapper (wrapped sockets) which intercept calls.  The wrapped calls would then identify http and manipulate it.  No idea how that interacts with SSL though.  That would probably some more custom work.
I suppose an injection process might be able to insert something like a custom socket factory but that functionality would need to be supported by every framework  And I doubt it is.