[undertow-dev] How to get response bytes before they are sent

[Nagaraj,Vikas]

Hello,

Is it possible to get the full content of a response body before it's sent?  I'm trying to sign the response and add this signature in a header.  There was a similar question on this list a couple of weeks ago, but that one was about signing the incoming request.  My current approach is, in HttpHandler.handleRequest():

- Create a javax.crypto.Signature object
- Use HttpServerExchange. addResponseWrapper() to add a StreamSinkConduit that updates the Signature object as write() is called
- Use HttpServerExchange.addResponseCommitListener() to add a callback that calls Signature.sign() when the response is ready to be sent

Good in theory, but I'm finding that the sign happens before the updates - looks like the Conduit is only active as the response is being sent.  Is there something else I should wrap to get the bytes as they're being added to the response?  Even better would be if I could read them directly from the ResponseCommitListener.beforeCommit() callback.  I can see the number of bytes that have been written, but not the actual data.

Note: I'm using Undertow 1.2.x, as we're on WildFly 9.

--
Vikas Nagaraj
vikas.nagaraj at safenet-inc.com<mailto:vikas.nagaraj at safenet-inc.com>




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