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I am running a varnish 3.0 server with nginx/php-fpm/wordpress behind it at http://www.whatsthatbug.com. Most folks seem to be able to get to the site just fine. But I have one visitor who is getting the 400 error from FireFox.

What she got was: Error 400 Bad Request

Bad Request Guru Meditation:

XID: 1237423987

Is there anything I can do with that XID to search with varnishlog for more info? Has anyone else had this error using varnish? Or can point me in a generally useful direction to solve this?

Thanks!

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2 Answers

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this might be of some help

https://www.varnish-cache.org/trac/wiki/Varnishlog

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Did you add the 

LimitRequestFieldSize 200

because of this the range header DoS vulnerability of Apache? Then the reason for your error is, that the cookie length of your one visitor is longer than 200 chars! Ask your visitor to request the page without cookies and extend LimitRequestFieldSize 

LimitRequestFieldSize 300
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I did not add LimitRequestFieldSize. I'm using Nginx and PHP-FPM behind the Varnish cache. – danielj Sep 1 '11 at 15:23
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