A summary of the Serf Internet robot. Including details for the owner, description, HTTP user agent and whether this robot adheres to the robot exclusion standard.
Who owns the Serf robot? Is it a good or a bad robot? And why is it visiting your website?
Shown below is a sample log file entry for the Serf web robot. It’s derived from an Apache web server log file. From the log entry information about how the robot identifies itself, HTTP User Agent, and where it is hosted are given.
Server Log File
www.vntweb.co.uk 127.0.0.1 - - [10/Oct/2021:16:27:16 +0100] "GET /wp-content/themes/vntweb-vntweb19/images/business-dev.jpg HTTP/1.1" 200 3481 "https://www.vntweb.co.uk/uptimerobot-web-robot/" "Serf/1.3.9 (mod_pagespeed/1.13.35.2-0)"
HTTP User Agent
Serf/1.3.9
IP Addresses
The observed IP address was 127.0.0.1.
This is the generic local IP address assigned to a computer, not the specific unique address for the network.
Owner
Computer dependant
Country
Computer dependant
Exclusion
The user-agent string does not include a reference to a website.
The Serf robot operates in association with mod_PageSpeed.
The serf robot is working for the website itself. Therefore whether it complies with the robots.txt exclusion standard is not an issue.
The exclusion standard which was described at http://www.robotstxt.org/wc/exclusion.html#robotstxt, but is not currently available. Information is available on the same website https://www.robotstxt.org/robotstxt.html and also on the w3c website at https://www.w3.org/TR/html4/appendix/notes.html#h-B.4.1.1.
Further Info
The PageSpeed modules are added to Linux servers: Apache and Nginx to automatically optimise the website(s).
mod_PageSpeed can be used to:
- Minify HTML, CSS, and JavaScript.
- Optimise file caching.
- Combine external JavaScript files and optimise them.
- Optimise file loading by giving priority to CSS and deferring JavaScript files
- Optimizes images by compressing them and converting PNG and JPG images to the newer WebP format.
Interesting links:
