no such pool Failed Tcl_pool_GetFromObj

Sorry... I wasn't sure which part you were asking about. I think the problem is with the syntax you were using. If you wrap the statement being caught in square brackets [ ], that gets executed and is not handled as expected by catch. If you use curly braces { }, it should work and give you the output in $result.

Here is an example which shows the catch result:

 
 when HTTP_REQUEST {    
  
    set pool_name "non_existent_pool" 
  
    if {[catch {pool $pool_name} result]}{ 
       log local0. "Caught error: $result" 
    } 
 } 
 

The logged value for $result is:

Caught error: no such pool

Aaron