400 response ...

[Alan Williamson]

We are getting an awful lot of 400 responses being sent back to our clients.

For example, consider these two, first one resultsed in a 400, where as 
the second one didn't.

79.a.c.d - - [04/Jul/2008:13:14:21 +0000] GET /sportbladet/?service=rss 
HTTP/1.1 "400" 173 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; 
en-US; rv:1.9) Gecko/2008061004 Firefox/3.0" "-"

79.a.c.d - - [04/Jul/2008:13:14:22 +0000] GET /sportbladet/?service=rss 
HTTP/1.1 "200" 18003 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 
10.4; en-US; rv:1.9) Gecko/2008061004 Firefox/3.0" "-"


We are using nginx as a frontend loadbalancer, but our code does not 
generate 400 errors.  So under what circumstances would nginx return a 
400 request?

Thanks

a

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Alan Williamson
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