Forum Discussion

Nimbostratus

Nov 22, 2011

ProxyPass V10 iRule issues...

Hi there,

I'm trying to set-up the ProxyPass v10 iRule from here (http://devcentral.f5.com/wiki/iRules.ProxyPassV10.ashx), and I'm hitting a few issues with Firefox...

It's probably worth noting that I've made a couple of tweaks to the rule to fit with how we intend to use it...

Top section of the rule looks like this now:

when RULE_INIT {
    Enable to debug ProxyPass translations via log messages in /var/log/ltm
    (2 = verbose, 1 = essential, 0 = none)
   set static::ProxyPassDebug 02

    Enable to rewrite page content (try a setting of 1 first)
    (2 = attempt to rewrite host/path and just /path, 1 = attempt to rewrite host/path)
   set static::RewriteResponsePayload 0
}

when CLIENT_ACCEPTED {
    Get the default pool name.  This is used later to explicitly select 
    the default pool for requests which don't have a pool specified in 
    the class.
   set default_pool [LB::server pool]

   if { $static::ProxyPassDebug > 1 } {
      log local0. "[virtual name]: [IP::client_addr]:[TCP::client_port] -> [IP::local_addr]:[TCP::local_port]"[IP::local_addr]:[TCP::local_port] DefaultPool: $default_pool"
   }
}

when HTTP_REQUEST {
    "bypass" tracks whether or not we made any changes inbound so we
    can skip changes on the outbound traffic for greater efficiency.
   set bypass 1

    The name of the Data Group (aka class) we are going to use
   set vname [getfield [virtual name] / 4]
   set cname [substr $vname 0 .]
   set clname "ProxyPass[virtual name]""ProxyPass_$cname"

    Initialize other local variables used in this rule
   set orig_uri "[HTTP::uri]"
   set orig_host "[HTTP::host]"
   set log_prefix "VS=[virtual name], Host=$orig_host, URI=$orig_uri"
   set clientside ""
   set serverside ""
   set newpool ""
   set ppass ""

   if {! [class exists $clname]} {
      log local0. "$log_prefix: Data Group $clname not found."
      pool $default_pool
      return
   } else {
  log local0. "$log_prefix: Data Group $clname found."   
      set ppass [class match -element "$orig_host$orig_uri" starts_with $clname]
      if {$ppass eq ""} {
          Did not find with hostname, look for just path
         set ppass [class match -element "$orig_uri" starts_with $clname]
      }
      if {$ppass eq ""} {
          No entries found
         if { $static::ProxyPassDebug > 0 } {
            log local0. "$log_prefix: No rule found"  
         }

   Get default redirect value. 
  set rurl [class match -value $cname equals Root_Redirect]
  if { $static::ProxyPassDebug > 0 } {
log local0. "$log_prefix: redirect found. Redirecting to $rurl"
  }

 HTTP::redirect "https://[HTTP::host]$rurl" 
         pool $default_pool
         return
      }
   }
Basically, I've changed the name format of the datagroup that it's looking for, and added a 'Default redirect' which is used to catch either the root directory or an invalid application URL. 
This code works fine in IE, however I'm consistently getting the following error in FF:Corrupted Content Error
The page you are trying to view cannot be shown because an error in the data transmission was detected.
Any ideas where this issue could come from?

21 Replies

hoolio
Cirrostratus
Nov 22, 2011
Hi Gavin,

Can you post the full rule and debug from /var/log/ltm as an attachment to this post?

Aaron
GavinW_29074
Nimbostratus
Nov 22, 2011
Hoolio

Please find the rule attached.

The log file extract looks like:

Nov 22 17:17:20 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : /Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https: 192.168.100.208:62230 -> 172.16.26.235:443 DefaultPool: /Common/cmswokingham

Nov 22 17:17:20 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/: Data Group ProxyPass_cms found.

Nov 22 17:17:20 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/: No rule found

Nov 22 17:17:20 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/: redirect found. Redirecting to /CMSBackOffice

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice: Data Group ProxyPass_cms found.

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice: Found Rule, Client Host=cms.wokingham.card.co.uk, Client Path=/CMSBackOffice, Server Host=cms.wokingham.card.co.uk, Server Path=/CMSBackOffice

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice: Redirecting to https://cms.wokingham.card.co.uk/CMSBackOffice/

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice/: Data Group ProxyPass_cms found.

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice/: Found Rule, Client Host=cms.wokingham.card.co.uk, Client Path=/CMSBackOffice, Server Host=cms.wokingham.card.co.uk, Server Path=/CMSBackOffice

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice/: Using default pool /Common/cmswokingham

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice/: New Host=cms.wokingham.card.co.uk, New Path=/CMSBackOffice/

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice/: Changing response header Location: https://cms.wokingham.card.co.uk/CMSBackOffice/home with https://cms.wokingham.card.co.uk/CMSBackOffice/home

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : Modifying cookie JSESSIONID path from /CMSBackOffice to /CMSBackOffice

Nov 22 17:17:21 tmm1 info tmm1[6378]: Rule /Common/ProxyPass : Inserting cookie: JSESSIONID=c4826b0b66b7729fa2d92f7064c3; Path=/CMSBackOffice

Relevant data group 'ProxyPass_cms' looks like:
ltm data-group internal /Common/ProxyPass_cms { records { /CMSBackOffice { data /CMSBackOffice } /CMSResources { data /CMSResources } } type string }

Cheers

Gav
hoolio
Cirrostratus
Nov 22, 2011
It seems like this could be caused by multiple Location headers:

http://forums.mozillazine.org/viewtopic.php?f=23&t=2284289

Can you test with a browser plugin like HttpFox for Firefox and reply here with the request/response which causes the error?

Also, it doesn't look like you're actually rewriting anything with ProxyPass as your find/replace strings are the same. What are you trying to accomplish with the iRule?

Aaron
GavinW_29074
Nimbostratus
Nov 22, 2011
Aaron

Cheers for the update. Will pull the http logs out in the morning.

As regards what I'm trying to achieve... This is the base implementation to test the rule. Moving forward I'm going to have some urls that do need to be re-written such that the client hits a dfferent url to that on the server...

Cheers

Gav
GavinW_29074
Nimbostratus
Nov 23, 2011
Aaron

The HTTP headers come back with:

https://cms.wokingham.card.co.uk/

GET / HTTP/1.1

Host: cms.wokingham.card.co.uk

User-Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-gb,en;q=0.5

Accept-Encoding: gzip, deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

DNT: 1

Connection: keep-alive

HTTP/1.0 302 Found

Location: https://cms.wokingham.card.co.uk/CMSBackOffice

Server: BigIP

Connection: Keep-Alive

Content-Length: 0

----------------------------------------------------------

https://cms.wokingham.card.co.uk/CMSBackOffice

GET /CMSBackOffice HTTP/1.1

Host: cms.wokingham.card.co.uk

User-Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-gb,en;q=0.5

Accept-Encoding: gzip, deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

DNT: 1

Connection: keep-alive

HTTP/1.0 302 Found

Location: https://cms.wokingham.card.co.uk/CMSBackOffice/

Server: BigIP

Connection: Keep-Alive

Content-Length: 0
GavinW_29074
Nimbostratus
Nov 23, 2011
As an update, I've installed Chrome, and it's working fine...

So appears to be Firefox specific :S
GavinW_29074
Nimbostratus
Nov 23, 2011
Have run some further testing on Chrome, and it does indeed appear that the rule is sending back 2 Location values...

See the following extract from the Chrome Developer Net tab:

Request URL:https://cms.wokingham.card.co.uk/CMSBackOffice

Request Method:GET

Status Code:302 Moved Temporarily

Request Headersview source

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3

Accept-Encoding:gzip,deflate,sdch

Accept-Language:en-GB,en-US;q=0.8,en;q=0.6

Cache-Control:max-age=0

Connection:keep-alive

Cookie:JSESSIONID=04214c461c6c74feea18a50c6769; jsonTable={"2105498430": [1322041650012, 1, 0, 0, 0], "2779550008": [1322041640311, 1, 0, 0, 0], "3714451117": [1322041650008, 1, 0, 0, 3], "v": 31295000}

Host:cms.wokingham.card.co.uk

User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

Response Headersview parsed

HTTP/1.1 302 Moved Temporarily

Location: https://cms.wokingham.card.co.uk/CMSBackOffice/home

Content-Type: text/html; charset=iso-8859-1

Content-Length: 0

Location:: https://cms.wokingham.card.co.uk/CMSBackOffice/home

This redirect corresponds to the following Log entry on the F5:

Nov 23 11:58:30 tmm info tmm[6377]: Rule /Common/ProxyPass : VS=/Common/WokinghamCMS.app/cms.wokingham.card.co.uk_https, Host=cms.wokingham.card.co.uk, URI=/CMSBackOffice: Changing response header Location: https://cms.wokingham.card.co.uk/CMSBackOffice/home with https://cms.wokingham.card.co.uk/CMSBackOffice/home

More debugging to do I think...
hoolio
Cirrostratus
Nov 23, 2011
Hi Gavin,

Nice work in narrowing this down! I updated the codeshare entry to remove the extra colon on a few of the HTTP::header replace commands.

Thanks for diagnosing this.

Aaron
GavinW_29074
Nimbostratus
Nov 23, 2011
Aaron,

No worries, glad I could be of assistance...

Plus it means I've got a fairly good understanding of this rule now :)

Cheers

Gav
Opher_Shachar_6
Nimbostratus
Feb 02, 2012
Hello,

I've modified the iRule to address several issues:

Change the 'protocol' (https or http) of absolute URLs on rewrites (in reponses) as necessary

If doing Response Paylod rewrite then also rewite the url-encoded form of urls

Insert 'X-Forwarded-For' only if SNAT used is not 'none'

Added a new parameter to allow other modules (eg. httpclass) to select pool

Fix parsing of [virtual name] for building the ProxyPass class name

Fix Set-Cookie Domain attribute rewrite

Some cosmetic indentation fixes

Add some debug level logs

attached are two patches: one without the indentation fixes -- so you can see just what I changed; and the full patch.

Regards,

Opher Shachar.