Information all about how pages are served and how page content is negotiated.
Overview Static files (index.html) can be served without logging a request in access_log. Cause This occurs when mod_pagespeed is enabled. Pagespeed intercepts the request higher in Apache’s processing axis before mod_log_config and serves the static file from its optimized cache if present. This does not affect files which have a Pragma: no-cache header such as…
Overview All HTTP servers enforce a collection of HTTP rate-limiting to reduce abuse and achieve a high reliability. This system is built on a fork of mod_evasive, which implements an interval-based bean counter, in other words it begins counting URI requests for a given duration once the first request is received. There are two classes of…
Overview An .htaccess file may be shared across multiple domains and subdomains by being located in a common parent directory. Locating an .htaccess under /var/www will allow any domain or subdomain located under /var/www to inherit these rules; effectively any domain or subdomain that is not managed by a secondary user within that user’s respective…
Overview A forwarded website can be accomplished by first creating a subdomain or addon domain in the control panel, then using an .htaccess in document root to redirect all traffic to the new web site using mod_rewrite. Important terminology Forwarded domain: domain that will redirect to the target domain Target domain: domain that is the final destination…
PageSpeed will make a best effort to expire its asset (.css, .js, .png, .gif, .jpg) cache periodically. During periods of rapid changes, automatic expunction may lag behind changes pushed to a server necessitating a manual flush of the cache. Expunging PageSpeed cache A PURGE header may be sent to the asset forcing PageSpeed to expunge its…
Overview When uploading a particular file it fails with a 406, Not Acceptable error message. Cause Effective April 9, 2016, all inbound file uploads are scanned for viruses before being saved on the server. If a file is found to contain a virus, it is rejected with a 406, Not Acceptable message. File scanning is performed…
Overview A redirect changes the URL, in browser, from one URL to another. A variety of redirect codes exist to force a variety of behaviors in the browser (or spider). Usage All redirects are controlled through a .htaccess file in the document root of your target domain or subdomain. The following stanza is a common,…
Overview HTTP2 is a next-generation binary protocol that supports multiplexing HTTP requests to greatly decrease page load times. Your site loads up to 2x faster, and it’s supported by every modern browser. Activating HTTP2 HTTP2 support requires a SSL certificate (and IP address) to activate. HTTP2 is available on all v6.5+ and newer platforms. No further…
Overview PageSpeed (mod_pagespeed) optimizes your site and makes content load more quickly. PageSpeed applies a variety of filters including minifying scripts, inlining CSS, and automatically deferring JavaScript to avoid blocking DOM rendering. Users can browse your site with less latency, and in turn, improve visitor engagement. Availability PageSpeed is available on all v5+ platforms. PageSpeed is enabled by…
Overview In rare certain situations, PageSpeed may make debugging a staging site more difficult or interfere with custom JavaScript that manipulates the DOM in a HEAD tag. Although likely unnecessary to disable, PageSpeed may be disabled on your site with a simple htaccess directive: Create a file named .htaccess in the document root of the…