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Brad_Otlin's avatar
Brad_Otlin
Icon for Employee rankEmployee
Nov 02, 2011

http::status 404 will NOT process http::respond 200

I have this iRule to check for 404s from the servers and reply to client with some simple html maint page. However, when a user requests a page that is not on the server, they just get the standard "IE cannot display the webpage". tcpdumps on internal BIGIP vlan show the server returning the 404. tcpdump on external bigip VLAN shows the client get, an ack from BIGIP to client but no response with either the 404 or the html in my irule. If I remove the iRule and attempt the same url with bad page request, the client gets standard 404 from server. For some reason BIGIP is not doing anything after evaluating for the status code 404. I've also tried doing an http::redirect to another site instead of http::respond and still nothing is returned by BIGIP. What am I missing>

 

 

See iRule code below:

 

 

when HTTP_RESPONSE {

 

 

if { [HTTP::status] == 404 } {

 

 

HTTP::respond 200 content "

 

 

Website

 

 

 

 

 

 

 

Site is Currently Unavailable

 

 

 

 

 

Site is experiencing a planned/unplanned outage, which is causing disruption for many users. We apologize for the inconvenience and are working to restore service. Please check back to receive the latest update.

 

 

 

 

Thank you.

 

 

 

 

IT

 

 

 

 

 

 

 

 

 

 

     

     

 

 

 

 

 

 

 

 

 

 

"

 

}

 

}

 

application delivery
dev
devops
iRules

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  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    Nov 02, 2011
    this is mine. 

    [root@iris:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.17.33:http
   ip protocol tcp
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@iris:Active] config  b pool foo list
pool foo {
   members 10.10.70.110:http {}
}
[root@iris:Active] config  b rule myrule list
rule myrule {
   when HTTP_RESPONSE {
        if { [HTTP::status] == 404 } {
                HTTP::respond 200 content "maintenance pageSite is Currently Unavailable"
        }
}
}

 curl -i http://172.28.17.33/notreal
HTTP/1.0 200 OK
Server: BigIP
Connection: Keep-Alive
Content-Length: 84

maintenance pageSite is Currently Unavailable

[root@iris:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.17.20(38858) <-> 172.28.17.33(80)
1320255154.0773 (0.0011)  C>S
---------------------------------------------------------------
GET /notreal HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.17.33
Accept: */*

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

New TCP connection 2: 10.10.72.30(38858) <-> 10.10.70.110(80)
1320255154.0776 (0.0003)  C>S
---------------------------------------------------------------
GET /notreal HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Host: 172.28.17.33
Accept: */*

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

1320255154.0795 (0.0018)  S>C
---------------------------------------------------------------
HTTP/1.1 404 Not Found
Date: Wed, 02 Nov 2011 08:42:45 GMT
Server: Apache/2.0.59 (rPath)
Vary: Accept-Encoding
Content-Length: 282
Content-Type: text/html; charset=iso-8859-1



404 Not Found

Not Found
The requested URL /notreal was not found on this server.

Apache/2.0.59 (rPath) Server at 172.28.17.33 Port 80

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

1320255154.0796 (0.0023)  S>C
---------------------------------------------------------------
HTTP/1.0 200 OK
Server: BigIP
Connection: Keep-Alive
Content-Length: 84

maintenance pageSite is Currently Unavailable
---------------------------------------------------------------
  • Brad_Otlin's avatar
    Brad_Otlin
    Icon for Employee rankEmployee
    Nov 03, 2011
    I found my problem. This virtual server is also using the WAM. If I disable webaccel for this URL, then the splashpage is displayed when I get a 404.

     

     

    Found SOL11143 where it showed how to disable WAM before irule processing:

     

     

     

    WAM::disable

     

    HTTP::close

     

     

     

    Rock and Roll. It works now.