What steps will reproduce the problem? 1. put a site up on WebFaction or another shared hosting using Nginx to reverse proxy Apache (not sure if my description is accurate) 2. use the browser and extensions set to enabled, as listed below, to load the site

What is the expected output? What do you see instead? Instead of web page: '502 Bad Gateway / nginx'

What version of the product are you using? On what operating system? FirePHP 0.3.1 FireBug 1.4.2 FireFox 3.5.3

Please provide any additional information below. http://sigmod.webfactional.com

I will have a solution for this soon.

In the meantime you could try reducing the size of each header from 5000 to 1000 or less.

See: http://code.google.com/p/firephp/source/browse/trunk/FirePHPCore/lib/FirePHPCore/FirePHP.class.php#860

Same problem here, reducing the header size doesn't help. Seems as if FirePHP headers confuse Nginx.

Using the same server configuration: Apache 2 + Nginx as reverse proxy. Client: FirePHP extension 0.4.3, FirePHPLibrary 0.3.1, Firefox 3.5.8.

It's buffer-size related issue, you need to increase the buffer sizes of your responses so that the header can fit into them. Look up the nginx doc to help you with that and experiment with increasingly large header sizes.

Comment deleted

Workaround for FirePHPCore: http://britg.com/2009/06/16/nginx-proxies-with-firephp/

Fixed in FirePHP 1.0: http://reference.developercompanion.com/#/Tools/FirePHPCompanion/Introduction/