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From Steve Zweep <>
Subject RE: Question about async mod_proxy_wstunnel and threads
Date Thu, 17 Jul 2014 18:54:07 GMT
Thanks Eric. 

BTW, the test setup I have is fairly simple. The websocket server just echoes received messages
from any client to all connected clients. I just connect 2 clients and send a message to the
server from one.  A tcpdump shows the correct packets are sent by the server.

- Steve

-----Original Message-----
From: Eric Covener [] 
Sent: Thursday, July 17, 2014 2:27 PM
To: Apache HTTP Server Development List
Subject: Re: Question about async mod_proxy_wstunnel and threads

On Thu, Jul 17, 2014 at 2:09 PM, Steve Zweep <> wrote:
> 1.       While communication from client to server works well, unsolicited
> messages from the server to clients seem to queue. If the client 
> subsequently sends a message back to the server, the original message 
> from the server is received. I would have expected the data from the 
> server to generate an event resulting in immediate delivery.

your expectation is consistent with mine -- must be a bug.

I don't think my ad-hoc testing had a push like that so it's probably something small in the
managing of the fds -- no reason for it to not be symmetric

> 2.       In attempts to debug this I experimented with
> ProxyWebsocketAsyncDelay. I observed that when this is used, the 
> connections never go into async mode. I.e. proxy_tunnel_pump() never returns SUSPENDED.
> As a result I see the same thread usage as when ProxyWebsocketAsync is 
> turned off. Is this expected behavior?

also not expected

> Any insights into what is going on here would be helpful. I noticed 
> that there have been a number of recent changes both to the event mpm 
> and mod_proxy_wstunnel. Perhaps there are still some known issues with 
> this code?

it is definitely new/rough/experimental and trunk-only.  I just added a note to the docs now.
 I will try to look this weekend at the two issues above.

Eric Covener
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