Hypermail

From: Alexey Kovyrin <alexey#kovyrin.net>
Date: Mon, 6 Oct 2008 23:53:15 -0400

Hello,

We've hit a problem here with haproxy->mongrels pool configuration. One of really many calls to a rails action which returns pretty standard 302 redirect is being converted to a 502 response. It works for many different urls and fails on one particular URL.

Rails ver: 2.0.2
Mongrel version: 1.1.5
HA-Proxy version 1.3.15.4 2008/09/14
Copyright 2000-2008 Willy Tarreau <w#1wt.eu>

Build options :

  TARGET  = linux26
  CPU     = generic
  CC      = gcc
  CFLAGS  = -O2 -g
  OPTIONS = USE_PCRE=1

Haproxy config:

global
  log 127.0.0.1 daemon debug
  ulimit-n 32768
  pidfile /var/run/haproxy.pid
  maxconn 8000
  uid apache
  gid apache
  daemon

defaults
  log global
  mode http
  option httplog
  option abortonclose
  retries 5
  maxconn 8000
  contimeout 3000000
  clitimeout 1500000
  srvtimeout 3000000
  redispatch
  mode http
  balance roundrobin

listen loops.scribd.com 127.0.0.1:8080

  server  mongrel00 127.0.0.1:8000 maxconn 1 check
  server  mongrel01 127.0.0.1:8001 maxconn 1 check
  server  mongrel02 127.0.0.1:8002 maxconn 1 check
  server  mongrel03 127.0.0.1:8003 maxconn 1 check

Direct request to the rails action:
root@loops:/opt/haproxy# curl http://127.0.0.1:8000/word/document_url/6417541 -v

* About to connect() to 127.0.0.1 port 8000 (#0)
*   Trying 127.0.0.1... connected
* Connected to 127.0.0.1 (127.0.0.1) port 8000 (#0)
> GET /word/document_url/6417541 HTTP/1.1
> User-Agent: curl/7.16.4 (i486-pc-linux-gnu) libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0
> Host: 127.0.0.1:8000

> Accept: */*
>
< HTTP/1.1 302 Moved Temporarily
< Connection: close
< Date: Tue, 07 Oct 2008 03:51:43 GMT
< Set-Cookie: _scribd_session=BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo%250ASGFzaHsABjoKQHVzZWR7AA%253D%253D--f04a5432060febfe36092a7e2b74525af0d4a01b;
domain=.scribd.com; path=/; expires=Sun, 01 Jan 2017 06:00:00 GMT
< Status: 302 Found
< Location: http://www.market-research-report.com/Merchant2/merchant.mvc?Store_Code=analysis&AFFIL=scribd2121&Screen=PROD&Product_Code=imtc0264
< X-Runtime: 0.01000
< Cache-Control: no-cache
< Server: Mongrel 1.1.5
< Content-Type: text/html; charset=utf-8
< Content-Length: 0
<

* Closing connection #0

Haproxy request:
root@loops:/opt/haproxy# curl http://127.0.0.1:8080/word/document_url/6417541 -v

* About to connect() to 127.0.0.1 port 8080 (#0)
*   Trying 127.0.0.1... connected
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /word/document_url/6417541 HTTP/1.1
> User-Agent: curl/7.16.4 (i486-pc-linux-gnu) libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0
> Host: 127.0.0.1:8080

> Accept: */*
>
* HTTP 1.0, assume close after body
< HTTP/1.0 502 Bad Gateway
< Cache-Control: no-cache
< Connection: close
< Content-Type: text/html
<
<html><body><h1>502 Bad Gateway</h1>

The server returned an invalid or incomplete response.
</body></html>

* Closing connection #0

Debug output from haproxy:

00000002:scribd.com.accept(0007)=0008 from [127.0.0.1:35163]
00000002:scribd.com.clireq[0008:ffff]: GET /word/document_url/6417541 HTTP/1.1
00000002:scribd.com.clihdr[0008:ffff]: User-Agent: curl/7.16.4

(i486-pc-linux-gnu) libcurl/7.16.4 OpenSSL/0.9.8e zlib/1.2.3.3 libidn/1.0

00000002:scribd.com.clihdr[0008:ffff]: Host: 127.0.0.1:8080
00000002:scribd.com.clihdr[0008:ffff]: Accept: */*
00000002:scribd.com.srvrep[0008:0009]: HTTP/1.1 302 Moved Temporarily
00000002:scribd.com.srvhdr[0008:0009]: Connection: close
00000002:scribd.com.srvhdr[0008:0009]: Date: Tue, 07 Oct 2008 03:52:01 GMT
00000002:scribd.com.srvhdr[0008:0009]: Set-Cookie:

_scribd_session=BAh7BiIKZmxhc2hJQzonQWN0aW9uQ29udHJvbGxlcjo6Rmxhc2g6OkZsYXNo%250ASGFzaHsABjoKQHVzZWR7AA%253D%253D--f04a5432060febfe36092a7e2b74525af0d4a01b; domain=.scribd.com; path=/; expires=Sun, 01 Jan 2017 06:00:00 GMT

00000002:scribd.com.srvhdr[0008:0009]: Status: 302 Found
00000002:scribd.com.srvcls[0008:0009]
00000002:scribd.com.srvcls[0008:0009]
00000002:scribd.com.srvcls[0008:0009]
00000002:scribd.com.clicls[0008:0009]
00000002:scribd.com.srvcls[0008:0009]
00000002:scribd.com.closed[0008:0009]

Please advise on possible solutions/workarounds/etc.

Thanks in advance.

-- 
Alexey Kovyrin
http://kovyrin.info/

Received on 2008/10/07 05:53

Rails' 302 redirect is being converted to 502