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Puli's avatar
Puli
Icon for Nimbostratus rankNimbostratus
Jul 11, 2012

How to ignore Some HTTP get on a page

We have four object references that are on every page in our website.

 

These four are actually not required to display the page but hey get downloaded by the browser. Each of these are about 400k in size

 

 

How can i ignore gets on these 4 objects when a get request comes in in IRule.

 

How do i respond to browser so it doesn't download the object ?

 

 

Any ideas

 

thanks,

 

Puli.

 

2 Replies

  • is HTTP::respond applicable?

    HTTP::respond wiki

    https://devcentral.f5.com/wiki/iRules.HTTP__respond.ashx

    e.g.

    [root@ve10:Active] config  b virtual bar list
    virtual bar {
       snat automap
       pool foo
       destination 172.28.19.79:80
       ip protocol 6
       rules myrule
       profiles {
          http {}
          tcp {}
       }
    }
    [root@ve10:Active] config  b pool foo list
    pool foo {
       members 200.200.200.101:80 {}
    }
    [root@ve10:Active] config  b rule myrule list
    rule myrule {
       when HTTP_REQUEST {
       if {[HTTP::uri] equals "/hugefile.jpg"} {
          HTTP::respond 200 content ""
       }
    }
    }
    
     on client
    
     curl -i http://172.28.19.79/hugefile.jpg
    HTTP/1.0 200 OK
    Server: BigIP
    Connection: Keep-Alive
    Content-Length: 0
    
     tcpdump on bigip i.e. no connection to pool
    
    [root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
    New TCP connection 1: 172.28.19.251(37066) <-> 172.28.19.79(80)
    1342056660.8829 (0.0011)  C>S
    ---------------------------------------------------------------
    GET /hugefile.jpg 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: 172.28.19.79
    Accept: */*
    
    ---------------------------------------------------------------
    
    1342056660.8830 (0.0000)  S>C
    ---------------------------------------------------------------
    HTTP/1.0 200 OK
    Server: BigIP
    Connection: Keep-Alive
    Content-Length: 0
    
    ---------------------------------------------------------------
    
    1    1342056660.8846 (0.0016)  C>S  TCP FIN
    1    1342056660.8846 (0.0000)  S>C  TCP FIN
    
  • Why not set the correct cache control settings on the server or through an iRule to ensure clients use a cached copy of the four objects? Or you could cache them on LTM using RAM cache.

     

     

    Aaron