STREAM expression not working

Hi,

The stream profile only operates on the payload. The URI is in the HTTP headers, so you wouldn't want to use a stream profile and iRule for this. Also, for HTTP, it's not practical to use a stream profile and iRule on a request payload if the search/replace fields are a different length as there is no way to update the Content-Length header.

With that said, you can use HTTP::uri or HTTP::path to rewrite the URI or path in a request. You can use string map to search for one string and replace it with another.

Can you give a more exact example of what you're trying to replace in the URI?

Here is an example that would do exactly what you've tried. But I don't think it will solve the problem if abc is a fairly generic string in the URI.

 
 when HTTP_REQUEST { 
  
     Replace abc with abc?zzzz=123 in the URI 
    HTTP::uri [string map {abc abc?zzzz=123} [HTTP::uri]] 
 } 
 

Aaron

Hi Hoolio,

 

 

I tried the method before but the thing is that it does replaces the uri but not the subsequent uri the client is requesting... and thats why I went with STREAM expression. I have seen people on F5 forum using it in the HTTP_REQUEST...btw, how do I turn on debug to see if the STREAM expression is doing the replacement correctly? that would help for debugging...

 

 

thx. Hoolio for your help.

 

 

Is the URI you want to rewrite found in the HTTP response headers or the response payload?

 

 

Can you use a browser plugin like HttpFox for Firefox or Fiddler for IE to check this?

 

 

To rewrite a URI in the response headers, you can use HTTP::is_redirect and HTTP::header. To rewrite the response payload, you can use a stream profile and STREAM::expression iRule.

 

 

Here is an example iRule that was designed for rewriting the host in URLs. You could adapt it to handle the URI also (add code to HTTP_REQUEST to rewrite the URI).

 

 

HTTP Respond Data replacing?

 

http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=3457134602

 

 

Aaron

Good to hear you got it fixed.

 

 

Aaron