True, it does routing and does simple port-checks I think to make sure the backend application server is up. If that backend server is down, it routes the request to an app server that is up. In the proxy'd environment, this can happen: a) the backend app server crashes / goes down b) the plugin, not knowing it's actually hitting a reverse proxy, does a port check and says "Hey, the WAS instance is up, let me send this request to you". c) the proxy tries to pass the request on to the app, gets no response, and returns a "bad gateway" error message which in turn is presented back to the client. Without a proxy in the middle, this would happen: a) the backend app server crashes / goes down b) the plugin tries to talk to the app server, sees its down, and reroutes the request to a different app server. The client gets the right data back and would be none-the-wiser. So, how would I accomplish the latter with using the former? --- Axel-Stéphane SMORGRAV <Axel-Stephane.SMORGRAV@xxxxxxxxxxxxxx> wrote: > Sorry; I did not really get it the first time > around. The reverse proxy is located between the > plugin and WAS. > > However I do not see why this should interfere with > the work of the WAS plugin since the latter, as far > as I recall, basically just performs routing based > on the contents of the JSESSIONID cookie. > > -ascs > > -----Original Message----- > From: Richard de Vries > [mailto:richard_devries@xxxxxxxxx] > Sent: Wednesday, June 28, 2006 5:06 PM > To: users@xxxxxxxxxxxxxxxx > Subject: RE: [users@httpd] Reverse Proxy between > WebSphere and the WebServer - prevent "Bad Gateway" > errors. > > Actually, without the Proxy, the WAS plugin properly > detects an instance as being down and reroutes the > requests to one of the other app servers. So, with > the proxy, it keeps sending requests to the faulty > server causing people to see frequent "bad gateway > errors". > > But, you are correct when dealing with an > environment that only has one appserver that is > down, or dealing with an environment with multiple > app servers -- all of which are down. > > So, in my my multi-app server environment, the proxy > is basically breaking the plugin's functionality to > detect and reroute traffic. > > > --------------------------------------------------------------------- > 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 > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com --------------------------------------------------------------------- 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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