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David_L_'s avatar
David_L_
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Oct 05, 2007

HTTP Redirect based on protocol

It seems like this should be simple...

 

I want to use a single rule on multiple virtual servers to redirect traffic to another site. Simplified -

 

If the incoming request is HTTP://host.com/??? redirect to HTTP://host.net/???

 

If the incoming request is HTTPS://host.com/??? redirect to HTTPS://host.net/???

 

 

What I wrote was:

 

 

when HTTP_REQUEST {

 

HTTP::redirect "[URI::protocol [HTTP::request]]://host.net[HTTP::uri]"

 

}

 

 

Unfortunately this doesn't work because [HTTP::request] does not include the protocol.

 

 

The URI::protocol command seems like it should do what I want - except I can't seem to figure out how to feed it the entire request (https://host.com/???).

 

 

The examples given for URI::protocol have it parsing a literal string - ie:

 

when HTTP_REQUEST {

 

set url "http://www.foo.com/app/file.ext"

 

proto will be "http"

 

set proto [URI::protocol $url]

 

}

 

 

This is the behavior I need - except I need to evaluate the incoming request, not a literal string.

 

 

What am I missing?

 

 

Thanks!
application delivery
dev
devops
iRules

2 Replies

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  • Deb_Allen_18's avatar
    Deb_Allen_18
    Historic F5 Account
    Oct 05, 2007
    The simplest way would be to test the port on which the request is received, and set the protocol string based on that.
    
when HTTP_REQUEST {
  if {[string tolower [HTTP::host]] contains ".com"}{
    set host [string map -nocase {.com .net} [HTTP::host]]
    if {[TCP::local_port] == 443 {
      set proto "https"
    } else {
      set proto "http"
    }
    HTTP::redirect "$proto://$host[HTTP::uri]"
  }
}
    (Since you mentioned you want this to work on multiple VS, I took the liberty of also adding a string map function to re-write any .com hostname to .net, which you can of course adjust to match your specific requirements.)

    HTH

    /deb
  • David_L_'s avatar
    David_L_
    Icon for Nimbostratus rankNimbostratus
    Oct 08, 2007
    Thanks Deb - this is exactly what I needed! I was working on the same approach, but was (unsuccessfully) trying to use URI::port to determine the incoming port.

     

    (BTW for anyone using the code above - there's a missing "}" on line 4.)