Converting Regex to iRule

Hi Bob,

If you do want to rewrite the Host header, you'd need to make a small correction to specify the header name of Host:

when HTTP_REQUEST {
switch "[string tolower [HTTP::host]]" {
"test.sitename.us.com" -
"cms.test.sitename.us.com" {
HTTP::header replace Host "sitename.us.com"
}
}
}

Aaron

Thanks Aaron, however that seem to change anything. I'm still being redirected to my production website instead of the content mangement interface of the test site, and I've only have this applied to my test site, which makes it even stanger.

I'm attempting to add in some logging so I can confirm that its at least seeing it, and maybe try to figure out when its applying the rule, however i'm doing something wrong because its saying wrong agr for header, any thoughts on what I'm missing here:

when HTTP_REQUEST {
    switch "[string tolower [HTTP::host]]" {
        "test.sitename.us.com" -
        "cms.test.sitename.us.com" {
log local0. before:[HTTP::header]
            HTTP::header replace Host "sitename.us.com"
log local0. after:[HTTP::header]
        }
    }
}

Thanks,

Bob

It depends on which information you are wanting from the headers:

 

 

 

when HTTP_REQUEST {

 

switch "[string tolower [HTTP::host]]" {

 

"test.sitename.us.com" -

 

"cms.test.sitename.us.com" {

 

log local0. "Before: [HTTP::header names]"

 

HTTP::header replace Host "sitename.us.com"

 

log local0. "After: [HTTP::header names]"

 

}

 

}

 

}

 

 

 

Look here at Hoolio's Post for more information on logging HTTP Headers: http://devcentral.f5.com/wiki/default.aspx/iRules/LogHttpHeaders.html

 

I'd guess that the test application includes references to the production site in response headers and/or payload. You could use the iRule Michael referenced to troubleshoot this. Or you could use a browser plugin like Fiddler2 or HttpFox to track this. If you want to rewrite the response headers, you can use an iRule like this:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/RewriteHTTPRedirectHostname.html

 

 

If you need to rewrite the response content, you can use ProxyPass:

 

 

http://devcentral.f5.com/wiki/default.aspx/iRules/proxypassv10

 

 

Aaron

 

Thanks gents.. I believe my rule appears to be doing what its suppose to, which is rewriting the host header, I've confirmed that using the logging function, thanks for the help there.

 

 

I think my problem is happening during the sign in process where the referring URL is getting lost. For those users that want to log in and make changes to the site via the content management interface they access a secure page first to login. With out the rule in place the Request Header reads: GET /CMS/Login.aspx?referrerUrl=http%3a%2f%2fcms.test.sitename.us.comv%2fg2p%2fK.... With the rule in place the Request Header reads: GET /CMS/Login.aspx?referrerUrl=http%3a%2f%2fsitename.us.com%2fg2p%2fK... Which is the reason why I’m being directed back to my production read only version of the site and not the test content management interface area of the site.

 

 

So the host header getting rewritten at the LTM level is messing with the referring URL, I'm not sure there is a way around this one..

 

 

Bob

You could rewrite sitename.us.com to cms.test.sitename.us.com in the URI. Here's an example you could combine with the Host header rewriting:

when HTTP_REQUEST {

   if {[HTTP::uri] contains "sitename.us.com"}{
      HTTP::uri [string map {sitename.us.com cms.test.sitename.us.com} [HTTP::uri]]
   }
}

Aaron