HTTP_request and HTTP_response in same irule?

Thanks Kevin. I understand the headers are not going to come back with browser requests - but these are soap calls from a customized solution and I am working with the developers from other side to capture all headers, and preserve a designated one I insert in the subsequent calls. All of this is to mask the fact that an app we run does not share session ids between nodes so round robin breaks calls after login (that have just a valid session id) since they go to a different node. The workaround I proposed is to mark with special header 'tags' which will then be attached to their subsequent calls and I route using the irule to the correct node.