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Triggerman_1128's avatar
Triggerman_1128
Icon for Nimbostratus rankNimbostratus
Mar 29, 2010

Persistence based on Querystring

Howdy, we would like to persist based on a querystring. However, there would be two sources (clients) with the same querystring.

 

 

For example:

 

 

1. client one sends a request with a unique Querystring with name SessionID.

 

2. subsequent requests need to persist to the same responding web server.

 

3. client two sends the same querystring (SessionID) to finalise the transaction; therefore it needs to be sent to the same web server responded to above requests.

 

 

Is this technically feasible?

 

 

If not, the other option is to add the Querystring in the HTTP HEADERS but when it comes to step 3 (client two), it will send the SessionID as a querystring and we can't change this as this is a third party app.

 

 

Any assistance is appreciated.

 

application delivery
dev
devops
iRules

2 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Mar 29, 2010
    Hi,

    You can parse the query string parameter value and use it to persist off of. Will clients always send the parameter in each request? If so, here's an example to get started with: 

     
 when HTTP_REQUEST { 
  
     Check if query string parameter named SessionID has a value 
     http://devcentral.f5.com/wiki/default.aspx/iRules/uri__query 
    set sid [URI::query "?&[HTTP::query] &SessionID] 
  
    if {$sid ne ""}{ 
  
        Persist off of the session ID value 
       persist uie $sid 
    } 
 }

    Aaron
  • Triggerman_1128's avatar
    Triggerman_1128
    Icon for Nimbostratus rankNimbostratus
    Mar 29, 2010
    Hi Aaron,

     

     

    Thanks for the reply. Unfortunately, the querystring is not always in the URI.