I'm using third party service that has own notion of session and expects all requests in session to come from same IP. They claim that it's a required security measure and suggest to use proxy, LOL.
Is there any way to use same IP for several requests with Socket API?
Interval between requests in session is ~10 seconds, so keeping connection alive and reusing it should work. I've tried to setup proxy module that runs single instance and uses HttpClient with connection pool. Logging shows that after first request connection is properly released and stored in pool. While doing second request I see that pool has 1 connection, but HttpClient says that there in no free connection for route and opens new. Probably route changes somehow?
Actually, I solved this issue. Solution that I described in question was missing one step. As my connection was SSL authenticated, I had to use same context for all requests that I make.