Hello, don't know if this works or if you tried it already but here are some Environment Variables which could help. proxy-sendchunks or proxy-sendchunked or maybe proxy-initial-not-pooled. I changed the keep-alive timeout on the backend to the timeout of the frontend apache to minimize the "502 Bad Gateway" error. Michael >>> Prigge Scott <PriggeScottM@xxxxxxxxxxxxx> 11.11.09 18.45 Uhr >>> Hi. I'm running 2.2.8 on Linux with mod_proxy in a reverse proxy configuration, which is forwarding data to an application server. And there is a feature within this application which relies on HTTP POST data from the browser. We also have a third-party authentication module which is loaded as a shared object. When the authentication shared object not loaded in Apache, the HTTP POST data is spooled to the application server as it is being received. But when the auth shared object is loaded, the HTTP POST data is held until all of it is received from the browser. I can see in network traces that in both cases, Apache opens a new TCP connection with the application server immediately after the initial TCP connection with the browser is established. But over slow WAN connections for example, it takes a number of minutes to receive all of the POST data. And since Apache initiates a new TCP connection with the app server immediately, the TCP connection with the app server remains idle for a number of minutes. When Apache eventually does receive all of the POST data and begins forwarding it to the application server, the OS on the app server has timed out the TCP connection and responds with TCP RST packets. As a result, the browser receives a "502 Bad Gateway" response. Is there a way I might force Apache or (mod_proxy) to wait until all of the HTTP POST data is received before establishing a new TCP connection with the app server? I have tried adding a number of Apache/mod_proxy/mod_proxy_http directives in various combinations, but haven't been able to change this specific behavior. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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