Problem with GWT behind a reverse proxy - either nginx or apache
- by Don Branson
I'm having this problem with GWT when it's behind a reverse proxy. The backend app is deployed within a context - let's call it /context.
The GWT app works fine when I hit it directly:
http://host:8080/context/
I can configure a reverse proxy in front it it. Here's my nginx example:
upstream backend {
server 127.0.0.1:8080;
}
...
location / {
proxy_pass http://backend/context/;
}
But, when I run through the reverse proxy, GWT gets confused, saying:
2009-10-04 14:05:41.140:/:WARN: Login: ERROR: The serialization policy file '/C7F5ECA5E3C10B453290DE47D3BE0F0E.gwt.rpc' was not found; did you forget to include it in this deployment?
2009-10-04 14:05:41.140:/:WARN: Login: WARNING: Failed to get the SerializationPolicy 'C7F5ECA5E3C10B453290DE47D3BE0F0E' for module 'https://hostname:444/'; a legacy, 1.3.3 compatible, serialization policy will be used. You may experience SerializationExceptions as a result.
2009-10-04 14:05:41.292:/:WARN: StoryService: ERROR: The serialization policy file '/0445C2D48AEF2FB8CB70C4D4A7849D88.gwt.rpc' was not found; did you forget to include it in this deployment?
2009-10-04 14:05:41.292:/:WARN: StoryService: WARNING: Failed to get the SerializationPolicy '0445C2D48AEF2FB8CB70C4D4A7849D88' for module 'https://hostname:444/'; a legacy, 1.3.3 compatible, serialization policy will be used. You may experience SerializationExceptions as a result.
In other words, GWT isn't getting the word that it needs to prepend /context/ hen look for C7F5ECA5E3C10B453290DE47D3BE0F0E.gwt.rpc, but only when the request comes throught proxy. A workaround is to add the context to the url for the web site:
location /context/ {
proxy_pass http://backend/context/;
}
but that means the context is now part of the url that the user sees, and that's ugly.
Anybody know how to make GWT happy in this case?
Software versions:
GWT - 1.7.0 (same problem with 1.7.1)
Jetty - 6.1.21 (but the same problem existed under tomcat)
nginx - 0.7.62 (same problem under apache 2.x)
I've looked at the traffic between the proxy and the backend using DonsProxy, but there's nothing noteworthy there.
