# 502 Bad Gateway w/ Large Headers **URL:** \ **Category:** NGINX\ **Created:** [October 23, 2008, 5:54pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639 "2008-10-23T17:54:27Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![pachl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/5f9b8f/32.png) [@pachl](https://www.ruby-forum.com/u/pachl)\ **Post date:** [October 23, 2008, 5:54pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639/1 "2008-10-23T17:54:27Z")
I’m trying out this software FirePHP which is an out-of-band error logging that works with PHP and Firebug. With nginx setup as a load balancer, whenever large headers are being passed back (from FirePHP) it causes nginx to send back a 502 Bad Gateway message. Here are the headers being sent (I received these by going around the load balancer directly to the web server behind nginx). HTTP/1.x 200 OK Date: Thu, 23 Oct 2008 15:26:06 GMT Server: Apache/2.2.8 (Ubuntu) mod\_ssl/2.2.8 OpenSSL/0.9.8g Expires: Thu, 01 Jan 1970 00:00:00 GMT X-Wf-Protocol-1: [http://meta.wildfirehq.org/Protocol/JsonStream/0.2](http://meta.wildfirehq.org/Protocol/JsonStream/0.2) X-Wf-1-Plugin-1: [http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/0.2.0](http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/0.2.0) X-Wf-1-Structure-1: [http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1](http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1) X-Wf-1-1-1-1: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-Index: 32 X-Wf-1-1-1-2: 114|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Customer Search:\r\n”]| X-Wf-1-1-1-3: 114|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“----------------\r\n”]| X-Wf-1-1-1-4: 123|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400}," Record Updated: 3315643\r\n"]| Set-Cookie: LGCustomer=3315643; expires=Fri, 23-Oct-2009 21:14:52 GMT; path=/; [domain=capi.leadgeniuses.com](http://domain=capi.leadgeniuses.com) X-Wf-1-1-1-5: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-6: 138|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Incoming Data Processing & Normalization\r\n”]| X-Wf-1-1-1-7: 138|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“----------------------------------------\r\n”]| X-Wf-1-1-1-8: 98|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n”]| X-Wf-1-1-1-9: 2544|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400}," Name | Incoming | Normalized\n------------------------------------------------------------------\n Address | | \n Backruptcy | -1 | \n ChannelID | | 12\n ChannelTopicID | | 18\n City | | \n Country | US | US\n CreditRating | | \n CreditScore | | \n DOB | | \n DateOfBirth | | \n DayOfMonth | | 23\n DayOfWeek | | Thursday\n DebtLevel | | \n EducationLevel | | \n EmailAddress | | \n FirstName | | \n Gender | | \n Height | | \n HomeOwner | -1 | \n HomePhone | | \n IncomeLevel | 54000 | 54\n LastName | | \n Married | -1 | \n MonthOfYear | | October\n Race | | Other\n Retired | -1 | \n Season | | Out of Season\n Smoker | -1 | \n SocSecNum | 467923204 | 467-92-3204\n State | TX | TX\n Timestamp | | 2008-10-23 10:26:06\n Weight | | \n WorkPhone | | \n ZipCode | 77070 | 77070\r\n"]| X-Wf-1-1-1-10: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-11: 113|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“InfoID Results:\r\n”]| X-Wf-1-1-1-12: 113|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“---------------\r\n”]| X-Wf-1-1-1-13: 98|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n”]| X-Wf-1-1-1-14: 660|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400}," | InfoID | Class | Value | \n---------------------------------------------\n | 2693 | ChannelID | 12 | \n | 843 | ChannelTopicID | 18 | \n | 456 | DayOfWeek | Thursday | \n | 599 | DayOfMonth | 23 | \n | 2371 | MonthOfYear | October | \n | 446 | Season | Out of Season | \n | 447 | Race | Other | \n | 842 | Country | US | \n | 9943 | ZipCode | 77070 | \n | 1013 | IncomeLevel | 54 | \r\n"]| X-Wf-1-1-1-15: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-16: 126|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Top CategoryID: 5, 19, 3, 17\r\n”]| X-Wf-1-1-1-17: 126|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“----------------------------\r\n”]| X-Wf-1-1-1-18: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-19: 121|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Semi-Optimized Results:\r\n”]| X-Wf-1-1-1-20: 121|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“-----------------------\r\n”]| X-Wf-1-1-1-21: 98|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n”]| X-Wf-1-1-1-22: 894|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“ObjectClass | ObjectClassID | TotalImpressions | OfferID | WeightedAverage | CategoryID | Index | Source\n----------------------------------------------------------------------------------------------------------------\n Form | 55 | 6410 | 52 | 2.3612829682655 | 5 | 0 | Tested\n Form | 78 | 5785 | 72 | 1.7460832173666 | 19 | 1 | Tested\n Form | 56 | 5969 | 53 | 1.3848234390975 | 3 | 2 | Tested\n Form | 87 | 13947 | 78 | 0.3668415939516 | 17 | 3 | Tested\n Creative | 82 | 239645 | 71 | 0.0340722992295 | 3 | 4 | Tested\r\n”]| X-Wf-1-1-1-23: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-24: 115|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Untested Results:\r\n”]| X-Wf-1-1-1-25: 115|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“-----------------\r\n”]| X-Wf-1-1-1-26: 98|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n”]| X-Wf-1-1-1-27: 456|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400}," | OfferID | csvCreativeID | csvFormID | UntestedMethod | \n----------------------------------------------------------\n | 72 | | 78 | TopCategory | \n | 78 | | 87 | TopCategory | \n | 53 | | 56 | TopCategory | \n | 52 | | 55 | TopCategory | \r\n"]| X-Wf-1-1-1-28: 102|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n\r\n”]| X-Wf-1-1-1-29: 115|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Offer Selections:\r\n”]| X-Wf-1-1-1-30: 115|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“-----------------\r\n”]| X-Wf-1-1-1-31: 98|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“\r\n”]| X-Wf-1-1-1-32: 109|[{“Type”:“INFO”,“File”:“/opt/lg/common/lib/pklib/lib/FirePHP.class.php”,“Line”:400},“Empty Array\r\n”]| Content-Length: 2496 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/javascript Any idea what I can do to get this fixed? ---
**Author:** ![pachl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/5f9b8f/32.png) [@pachl](https://www.ruby-forum.com/u/pachl)\ **Post date:** [October 23, 2008, 5:59pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639/2 "2008-10-23T17:59:08Z")
On Thu, Oct 23, 2008 at 10:36:11AM -0500, Clint P. wrote: > I’m trying out this software FirePHP which is an out-of-band error > logging that works with PHP and Firebug. > > With nginx setup as a load balancer, whenever large headers are being > passed back (from FirePHP) it causes nginx to send back a 502 Bad > Gateway message. > > Here are the headers being sent (I received these by going around the > load balancer directly to the web server behind nginx). If you use proxying, then try something like ``` proxy_buffer_size 16k; # this is for header and first body part proxy_buffers 4 16k; ``` ---
**Author:** ![pachl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/5f9b8f/32.png) [@pachl](https://www.ruby-forum.com/u/pachl)\ **Post date:** [October 23, 2008, 8:55pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639/3 "2008-10-23T20:55:13Z")
That did it, thanks! Igor S. wrote: > ``` > On Thu, Oct 23, 2008 at 10:36:11AM -0500, Clint P. > wrote: > ``` > > > ``` > > I'm trying out this software FirePHP which is an > > out-of-band error > > logging that works with PHP and Firebug. > > > > With nginx setup as a load balancer, whenever large headers are being > > passed back (from FirePHP) it causes nginx to send back a 502 Bad > > Gateway message. > > > > Here are the headers being sent (I received these by going around the > > load balancer directly to the web server behind nginx). > > ``` > > ``` > If you use proxying, then try something like > > ``` > proxy_buffer_size 16k; # this is for header and first body part > proxy_buffers 4 16k; > > ``` > ``` ---
**Author:** ![pachl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/5f9b8f/32.png) [@pachl](https://www.ruby-forum.com/u/pachl)\ **Post date:** [October 23, 2008, 10:22pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639/4 "2008-10-23T22:22:06Z")
On Thu, Oct 23, 2008 at 01:15:06PM -0500, Clint P. wrote: > If I set this to a very large value, such as 128k does it allocate > this for every connection or only as needed? This really only needs > to be large for debugging purposes. Yes, the proxy\_buffer\_size is allocated for every connections, but proxy\_buffers are allocated on demand only. ---
**Author:** ![pachl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/5f9b8f/32.png) [@pachl](https://www.ruby-forum.com/u/pachl)\ **Post date:** [October 23, 2008, 10:06pm UTC](https://www.ruby-forum.com/t/502-bad-gateway-w-large-headers/151639/5 "2008-10-23T22:06:47Z")
If I set this to a very large value, such as 128k does it allocate this for every connection or only as needed?š This really only needs to be large for debugging purposes. Clint P. wrote: > That did it, thanks! > > Igor S. wrote: > > > ``` > > On Thu, Oct 23, 2008 at 10:36:11AM -0500, Clint P. > > wrote: > > ``` > > > > > ``` > > > I'm trying out this software FirePHP which is an > > > out-of-band error > > > logging that works with PHP and Firebug. > > > > > > With nginx setup as a load balancer, whenever large headers are being > > > passed back (from FirePHP) it causes nginx to send back a 502 Bad > > > Gateway message. > > > > > > Here are the headers being sent (I received these by going around the > > > load balancer directly to the web server behind nginx). > > > ``` > > > > > > > > ``` > > If you use proxying, then try something like > > > > ``` > > proxy_buffer_size 16k; # this is for header and first body part > > proxy_buffers 4 16k; > > > > ``` > > ```