Rewrite URL and change pool trouble

A couple of things.

1) The URI does not contain the hostname so your "if" is probably not passing.

1) The URI cannot have spaces. You are inserting a space before your "string range" command.

2) What is the value of $uri? I don't see it defined anywhere.

3) Have you added any logging to verify that your "if" condition is met? My guess is that it is not. it should be something like this:

if { [HTTP::uri] starts_with "/blog" } {
  ...
}

If you need to verify the host as well, you'll have to "and" two comparisons together using the HTTP::host value.

Adding simple logging is always your best debugging step to sort out issues like this.

-Joe