logging and redirects

I don't think there is a way to determine that HTTP::redirect or HTTP::respond have been used to respond to an HTTP request. You could set a variable in the redirect rule(s) and then look for that in the logging rule. You could use priority to dictate that the HTTP_REQUEST event in the log rule runs after the default priority of 500 (when HTTP_REQUEST priority 501). You could then log the request/response details in HTTP_REQUEST if the request is being redirected by another rule. You'd also want to make sure to unset the variable (or set the value to 0) if the request isn't being responded to from the rule, so the variable will be valid for all HTTP requests on the same TCP connection.

Also, someone mentioned previously that it's more efficient to save the log items in a single variable compared with using half a dozen:

 
 when HTTP_REQUEST priority 501 { 
  
     Check if another rule on this request has issued a response 
    if {[info exists redirected] && $redirected]}{ 
  
        Log the request details now, as there won't be a server response 
       log local0. "[virtual] [HTTP::host] [IP::client_addr] - \[[clock format [clock seconds] -format {%Y-%m-%d %H:%M:%S %z}]\] \"[HTTP::method] [HTTP::uri]\" - -" 
  
    } else }{ 
  
        Request isn't being answered from the BIG-IP so save the request details for logging in HTTP_RESPONSE 
       set request_info "[virtual] [HTTP::host] [IP::client_addr] - \[[clock format [clock seconds] -format {%Y-%m-%d %H:%M:%S %z}]\] \"[HTTP::method] [HTTP::uri]\" ..." 
    } 
 } 
 when HTTP_RESPONSE { 
     Response received from the pool.  Log the request + response details 
    log local0. "$request_info + some response details" 
 } 
 when LB_FAILED { 
     Load balancing the request failed, so log the request details here? 
    log local0. "$request_info - something indicating no server response?" 
 } 
 

Here is an example rule which could redirect the client and set a variable to track the redirection.

 
 when HTTP_REQUEST { 
  
     Check if some condition is true 
    if {$some_condition == 1}{ 
  
        Track that the client is being redirected 
       set redirected 1 
  
        Redirect the client 
       HTTP::redirect https://example.com 
  
    } else { 
  
        Track that the client is not being redirected 
       set redirected 0 
    } 
 } 
 

Aaron