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PageSpeed Proxy: Part 1

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PageSpeed Proxy: Part 1

· Performance Zone ·
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PageSpeed Module from Google, available for Apache and nginx, is a quick solution to improve web application network performance. As a bonus, if we configure nginx as a proxy server, then it can also serve as a web acceleration solution.

pagespeedThere is a growing number of PageSpeed optimization filters, anything from a straightforward CSS minification to a sophisticated images recompression. If you are already using Apache or nginx, PageSpeed module is relatively easy to use.

A different use case for PageSpeed is as a proxy server which you use for your daily browsing, e.g. what @jedisct1 has implemented via Apache proxy module. In this blog post, I show an alternative setup by using nginx instead, mainly by following the steps described in the ngx_pagespeed project.

Rather that doing things manually, you can just use the automated setup using Vagrant with VirtualBox. Simply clone pagespeed-proxy Git repository and then you only need to run:

vagrant up

For this experiment, the virtual machine is based on Ubuntu 12.04 LTS (Precise Pangolin) 64-bit. If you tweak the configuration inside Vagrantfile to a CentOS-based Vagrant box, e.g. from Opscode Bento collection, it should also work just fine. Should you rather trust your own virtual machine, you can create a Vagrant box from scratch automatically, check out my previous blog post on Using Packer to Create Vagrant Boxes.

The provisioning script of the box takes care the step of downloading the latest nginx and compile it with Google’s PageSpeed module. When it is ready, the script will also launch nginx as a forward proxy at port 8000 (this port is also forwarded and hence the proxy is available for the host machine as well). The proxy will run two optimizations filters (as a starting point): HTML comment removal and JavaScript minification, this can be proved by looking at the provided configuration file nginx.conf:

http {
    server {
        listen 8000;
        server_name localhost;
        location / {
            proxy_pass http://$http_host$uri$is_args$args;
        pagespeed on;
        pagespeed RewriteLevel PassThrough;
        pagespeed EnableFilters remove_comments,rewrite_javascript;
        pagespeed FileCachePath /home/vagrant/cache;

To verify the operation of the optimizing proxy, run these two commands (on the host machine) and observe the different outcomes:

curl http://ariya.github.io/js/random/index.html
curl -x localhost:8000 http://ariya.github.io/js/random/index.html

The second one pipes the original HTML content through the enabled optimization filters, comment removal and script rewrite, and thereby it will result in a smaller page. This is definitely just an illustration, feel free to play with a number of other PageSpeed filters and observe the impacts.

Obviously, it is also possible to setup your web browser to use the proxy at localhost:8000. When looking at the same URL given above, it will result in something like the following screenshot. Again, compare it with the case where you view the page without using the proxy.


For a more practical usage of the proxy, stay tuned!


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