# 502 in Nginx as a reverse proxy whithout cache **URL:** \ **Category:** NGINX\ **Created:** [August 1, 2013, 12:17pm UTC](https://www.ruby-forum.com/t/502-in-nginx-as-a-reverse-proxy-whithout-cache/236042 "2013-08-01T12:17:59Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![alcina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a587f6/32.png) [@alcina](https://www.ruby-forum.com/u/alcina)\ **Post date:** [August 1, 2013, 12:17pm UTC](https://www.ruby-forum.com/t/502-in-nginx-as-a-reverse-proxy-whithout-cache/236042/1 "2013-08-01T12:17:59Z")
Hi, Currently, we use Nginx as a reverse proxy without cache. Last monday we’ve rolled out a new version of PHP application which has appeared a several 502 errors. First of all, i’ve applied the workaround explained in thread [502 errors, upstream sent too big header](http://forum.nginx.org/read.php?2,188352) . The number of 502 have falled down but we can see a several 502 yet, but we haven’t any error log now in the nginx. This is Nginx parameters applied: {code} ## Size Limits client\_body\_buffer\_size 128K; client\_header\_buffer\_size 1M; client\_max\_body\_size 1M; large\_client\_header\_buffers 8 8k; ## Timeouts client\_body\_timeout 600; client\_header\_timeout 600; expires 24h; keepalive\_timeout 60 60; send\_timeout 600; ## TCP options tcp\_nodelay on; tcp\_nopush on; ## Proxy caching options proxy\_buffering on; proxy\_buffers 16 16k; proxy\_buffer\_size 32k; fastcgi\_buffers 16 16k; fastcgi\_buffer\_size 32k; proxy\_next\_upstream error timeout http\_500 http\_502 http\_503 http\_504; proxy\_connect\_timeout 60s; proxy\_read\_timeout 600s; proxy\_send\_timeout 600s; {code} This is the trace lines in acces log of Nginx and Apache: Las trazas son estas: NGINX log\_format main '$remote\_addr - $remote\_user [$time\_local] “$request” ’ '$status $body\_bytes\_sent “$http\_referer” ’ ‘“$http\_user\_agent” “$http\_x\_forwarded\_for”’; {code} 2.139.8.108 - - [31/Jul/2013:23:19:31 +0200] “GET /es/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm\_campaign=AAAAA&utm\_content=AAAAAAA&utm\_medium=email&utm\_source=ExactTarget&email=removed\_email\_address@domain.invalid&date=AAAAAAA&AL\_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm\_referrer= HTTP/1.1” 502 118 “[http://es.example.com/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm\_campaign=AAAAA&utm\_content=AAAAAAA&utm\_medium=email&utm\_source=ExactTarget&email=removed\_email\_address@domain.invalid&date=AAAAAAA&AL\_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA](http://es.example.com/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm_campaign=AAAAA&utm_content=AAAAAAA&utm_medium=email&utm_source=ExactTarget&email=removed_email_address@domain.invalid&date=AAAAAAA&AL_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA)” “Mozilla/5.0 (Linux; U; Android 2.3.3; es-es; GT-I9100 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1” “-” {code} LogFormat “"%{True-Client-IP}i" %h %t %T "%r" %\>s %b %{outstream}n/%{instream}n (%{ratio}n%%) "%{Referer}i" "%{Expires}o" "%{Cache-Control}o" "%{User-Agent}i" "%{Host}i" "%{X-Forwarded-For}i" %{mod\_php\_memory\_usage}n %P” itsysprod APACHE {code} “-” 10.253.1.61 [31/Jul/2013:23:19:31 +0200] 0 “GET /es/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm\_campaign=AAAAA&utm\_content=AAAAAAA&utm\_medium=email&utm\_source=ExactTarget&email=removed\_email\_address@domain.invalid&date=AAAAAAA&AL\_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA HTTP/1.0” 200 303 285/475 (60%) “[http://es.example.com/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm\_campaign=AAAAA&utm\_content=AAAAAAA&utm\_medium=email&utm\_source=ExactTarget&email=removed\_email\_address@domain.invalid&date=AAAAAAA&AL\_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA](http://es.example.com/descuentos-malaga/oferta-pelsandbody-masaje-tailandes-aromaterapia.html?mktc=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&utm_campaign=AAAAA&utm_content=AAAAAAA&utm_medium=email&utm_source=ExactTarget&email=removed_email_address@domain.invalid&date=AAAAAAA&AL_Hash=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA)” “Thu, 19 Nov 1981 08:52:00 GMT” “no-store, no-cache, must-revalidate, post-check=0, pre-check=0” “Mozilla/5.0 (Linux; U; Android 2.3.3; es-es; GT-I9100 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1” “[m.example.com](http://m.example.com)” “2.139.8.108, 10.253.1.60” 786432 30962 {code} Platform description # cat /etc/redhat-release CentOS release 6.3 (Final) # uname -a Linux balance01-prod 2.6.32-279.5.2.el6.x86\_64 #1 SMP Fri Aug 24 01:07:11 UTC 2012 x86\_64 x86\_64 x86\_64 GNU/Linux # nginx -v nginx version: nginx/1.2.4 Posted at Nginx Forum: > **[502 in Nginx as a reverse proxy whithout cache](https://forum.nginx.org/read.php?2,241447,241447#msg-241447)** > > Hi, Currently, we use Nginx as a reverse proxy without cache. Last monday we've rolled out a new version of PHP application which has appeared a several 502 errors. First of all, i've applied the workaround explained in thread... ---
**Author:** ![marc.cortinas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/76d3ee/32.png) [@marc.cortinas](https://www.ruby-forum.com/u/marc.cortinas)\ **Post date:** [August 2, 2013, 2:26pm UTC](https://www.ruby-forum.com/t/502-in-nginx-as-a-reverse-proxy-whithout-cache/236042/2 "2013-08-02T14:26:11Z")
I’ve found the error in the backend server, not in Nginx. We can close this thread, apologies! Posted at Nginx Forum: > **[Re: 502 in Nginx as a reverse proxy whithout cache](https://forum.nginx.org/read.php?2,241447,241477#msg-241477)** > > Hi, Currently, we use Nginx as a reverse proxy without cache. Last monday we've rolled out a new version of PHP application which has appeared a several 502 errors. First of all, i've applied the workaround explained in thread... ---
**Author:** ![marc.cortinas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/76d3ee/32.png) [@marc.cortinas](https://www.ruby-forum.com/u/marc.cortinas)\ **Post date:** [August 1, 2013, 12:53pm UTC](https://www.ruby-forum.com/t/502-in-nginx-as-a-reverse-proxy-whithout-cache/236042/3 "2013-08-01T12:53:38Z")
I’ve upgraded the nginx version 1.24 to 1.4.2, but this behavior still happens. Posted at Nginx Forum: > **[Re: 502 in Nginx as a reverse proxy whithout cache](https://forum.nginx.org/read.php?2,241447,241459#msg-241459)** > > Hi, Currently, we use Nginx as a reverse proxy without cache. Last monday we've rolled out a new version of PHP application which has appeared a several 502 errors. First of all, i've applied the workaround explained in thread...