Forum Discussion

DB's avatar
DB
Icon for Nimbostratus rankNimbostratus
Aug 10, 2020

Add Network Latency measurement to output of iRule Apology page?

I have a simple Apology page being presented by an iRule using "content" such as: HTTP::respond 200 content {     <html> ....  </html>  } Is there any mechanism I can use to include as output o...
application delivery
BIG-IP
iRules
Simon_Blakely's avatar
Simon_Blakely
Icon for Employee rankEmployee
Aug 10, 2020

You could capture a timestamp from CLIENT_ACCEPTED, and then record the time for HTTP_REQUEST, and present that.

You would effectively be measuring the RTT of an ACK back to the client, and then the Browser sending the first request.

Something like:

when CLIENT_ACCEPTED {
  set conntime [clock milliseconds]
}
 
when HTTP_REQUEST {
  set reqtime [clock milliseconds]
  set client_latency (reqtime - conntime)
  HTTP::respond 200 content { \
    <html> \
   ... \
   time to respond is $client_latency \
   .... \
   </html> }
}
 
when HTTP_RESPONSE {
  set resptime [clock milliseconds]
  set server_latency (resptime - reqtime)
}
 
when HTTP_RESPONSE_RELEASE {
  # reset conntime to track client latency
  set conntime [clock milliseconds]
}