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Peak_10_71174's avatar
Peak_10_71174
Icon for Nimbostratus rankNimbostratus
Oct 27, 2009

http redirect if no path match irule

I need to create an irule that accomplishes 2 things:

 

 

When incoming http requests for data.abc.com are received on a virtual server, they are redirected to www.abc.com/data. However, when a user requests data.abc.com/file.exe directly, that http request is then directed to the server pool on the load balancer that the virtual server is associated with. Below is my first attempt at writing this rule, but I am posting it on here because I am far from an expert in writing irules.

 

 

when HTTP_REQUEST {

 

switch -glob [string tolower [HTTP::path]] {

 

"data.abc.com/file.exe" {

 

pool data_pool

 

log local0. "HTML hit - data_pool chosen"

 

}

 

default {

 

HTTP::redirect "http://www.abc.com/data"

 

log local0. "redirect_chosen."

 

}

 

}

 

}

 

 

I used the switch command in this attempt, but I am in no way certain that this is the best way to accomplish this.
application delivery
dev
devops
iRules

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Oct 27, 2009
    HTTP::path will return the path in the URI (URI minus the query string). It will not include the host. HTTP::host will return the host header value. So you can remove data.abc.com from your rule and it should work fine.

     

     

    And switch is a good way to do this.

     

     

    Aaron
  • Matt_H_58911's avatar
    Matt_H_58911
    Icon for Nimbostratus rankNimbostratus
    Oct 29, 2009
    I would like to propose another way. Will this work?

     

     

    when HTTP_REQUEST {

     

    if { [HTTP::path] equals "/" } {

     

    HTTP::redirect "http://www.domian.com/base/"

     

    }

     

    if { [HTTP::path] equals $null } {

     

    HTTP::redirect "http://www.domain.com/base/"

     

    }

     

    }

     

     

    So if someone were to go to www.domain.com/downloadfile.exe the file would be downloaded

     

    if someone were to go to www.domain.com or www.domain.com/ they would be redirected to www.domain.com/base/

     

     

    Please advise.
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Oct 29, 2009
    Hi Matt,

     

     

    I'm not sure how the logic you've just posted relates to what you posted originally. Can you clarify what you want to have redirected and what you want to go to the pool? Do you just want to ensure a client request to / is redirected to the same host with a URI of /base/?

     

     

    Does the domain you're redirecting the the client to resolve to the virtual server you're running the iRule on? If so, you'll need to be careful to avoid infinite redirects in your logic.

     

     

    Also, the URI will never be null--all HTTP clients must specify a URI of / even if the user doesn't include a URI.

     

     

    Aaron
  • Matt_H_58911's avatar
    Matt_H_58911
    Icon for Nimbostratus rankNimbostratus
    Oct 29, 2009
    Hoolio,

     

     

    Yes the main goal is to have everything going to directly to (from the first post) data.abc.com be redirected to www.abc.com/data. The hang up is that we do have content files in data.abc.com so http://data.abc.com/thisfile.exe needs to be downloaded from the pool and not redirected. My thought was I could simplify the first rule with what I posted as if it met the data.abc.com/ only criteria then it would be redirected, if not it’s a valid request to an explicit download.

     

     

    Make sense?

     

  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Oct 29, 2009
    So, IF host = data.abc.com AND uri = /, redirect to www.abc.com/data?

    If so, try this: 

     
 when HTTP_REQUEST { 
   if { [string tolower [HTTP::host]] eq "data.abc.com" && [HTTP::uri] eq "/" } { 
     HTTP::redirect "http://www.[domain [HTTP::host] 2]/[getfield [HTTP::host] "." 1]" 
   } 
 }