I have put together a Rails form-mailing application using Action
Mailer and deployed it in a variety of instances without any problem.
In my latest attempted deployment, however, I find that submitting the
form results in the following error:
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /formtool/
Reason: Error reading from remote server
I am running Apache 2.2.3 with a Mongrel cluster. It seems that the
submission spawns an additional mongrel instance.
Strangely, the problem just disappeared on its own for a while and now
it has returned.
Has anyone else encountered this; and, more importantly does anyone
know what I can do about it?