Hi Cyril, In the docs you link to you say the default buffer is 8192 but the docs says 16384. Which is correct?
Simon -----Original Message----- From: Cyril Bonté [mailto:[email protected]] Sent: 07 June 2013 19:04 To: Simon Green Cc: '[email protected]' Subject: Re: HTTP 502 errors when backend returns 302 Hi Simon, Le 07/06/2013 18:53, Simon Green a écrit : > Hi List, > > We are having a problem that's been making us scratch our heads all > week, and really need some advice on. > > I'll start with some relevant background info: > > We're running We are running HAProxy 1.5-dev17 2012/12/28. > > Here is our HAProxy config: http://paste.wirehive.net/view/aa72de09 > > Here is a capture of the debug logs showing a 502 happening: > http://paste.wirehive.net/view/21750804 > > These are the relevant parts of the documentation I can find for this > error: http://paste.wirehive.net/view/d0fcf3ca > > Here is an example of a response that comes back from the server when > bypassing the HAProxy install: http://paste.wirehive.net/view/3e6e7297 > > We've found that a number of different pages give this error, all > using different bits of code, however possibly noteworthy is the > application is Magento Enterprise. > > I'd really appreciate some guidance on how I can get some more > detailed error/debug logging out of HAProxy. For example if one of the > headers is invalid, how can I find out which header? From the response you provided, it is quite normal. Is this really the whole response ? Some issues in it : 1. The response is not HTTP compliant, a lot of lines misses a "Set-Cookie:" at the beginning, this explain one kind of 502 returned by haproxy. This is not a valid line : CUSTOMER_SEGMENT_IDS=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; path=/; domain=wwrd.wearefolk.com; httponly 2. "Transfer-Encoding: chunked" without any chunk delimiter ? I hope you just truncated the response body for the bug report. 3. your response exceeds some limits : - more than the default 8192 bytes limit, please see tune.bufsize http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#3-tune.bufsize - too many headers, please see tune.http.maxhdr http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#3-tune.http.maxhdr As a side note, you should avoid using haproxy in tunnel mode with layer 7 headers manipulation (such as reqadd), try to re-enable "option httpclose" or better "option http-server-close" (don't forget also to add a "timeout http-keep-alve"). But honestly, you should really fix the application to prevent those many headers duplications. You'll always have trouble with such responses. > > Thanks in advance, > > Simon > -- Cyril Bonté
