Problem rewriting header attribute on HTTP code 302

A couple of notes pertaining to our Tcl implementation.

a) You don't really need to declare local variables with the "variable" command. On first initialization, variables are automatically scoped into a per-connection, local scope.

b) As for the regexp command, you may have misinterpreted the optional nature of the matchVar and subMatchVar's. The matchVar is the complete matching string, where subMatchVar is the part within the parenthesis. In order to have a subMatchVar, you must have a matchVar (Tcl otherwise doesn't know whether you meant matchVar or subMatchVar). I often see the use of the variable '->' to make this appear more readable, however it is still just a garbage variable.

Eg: regexp .+:9080/(.*) [HTTP::header Location] -> whatiwant

c) In order to replace the header, you need to specify "replace" on the HTTP::header command. I am looking into why this ended up resulting in the bizarre error message you received, but it's probably some kind of bug.

d) Thanks for continuing to try!

Here is an updated example of your rule:

 
 when HTTP_RESPONSE {  
    if { [HTTP::header Location] starts_with "http://dev.oursite.com:9080" } {  
       regexp .+:9080/(.*) [HTTP::header Location] garbage whatiwant  
       set thingy "http://dev.oursite.com/$whatiwant"  
       log "Thingy is $thingy"  
       HTTP::header replace Location $thingy  
    }  
 }