HTTP Zones (previously Cache rules) use a simple wildcard format. The format wildcard format used in popular operating systems in respect to the
* character. The
| character can be used to supply multiple options for a rule. See the examples below for more information.
|/abc/*||Matches a static file directory or path component||"/abc", "/abc/1.html", "/abc.html"|
|*.css||Matches an extension of css||"/a/main.css", "/main.css"|
|/style/*.css||Matches an extension of css within the directory of style||"/style/main.css", "/style/2/main.css"|
|/abc.html||Matches /abc.html exactly||only "/abc.html"|
|.css|.js||Matches an extension of css or js||"/a/main.css", "/jquery.js"|
|type:images||Matches images. Valid types include: images, resources, documents and sound||"image.png", "image.jpg"|
We supply a set of pre-existing cache categories that can be applied over many filetypes (using the
type:<typename> syntax). These are as follows:
- images: Matches .jpg, .jpeg, .gif, .ico, .png, .bmp, .pict, .tif, .tiff, .svg, .svgz
- sound: Matches .midi, .mid, .pls, .mp3, .wav
- documents: Matches .csv, .doc, .pdf, .ppt, .eps, .docx, .xlsx, .xls, .pptx, .ps
- resources: Matches .css, .js, .swf, .ttf, .eot, .woff, .ejs, .class, .jar, .otf, .webp
Have we missed your favourite filetype? You can define custom rules using the wildcard format. You can also contact us via support ticket to extend these lists.
There two conditions that determine if a request is cached. First if the file is over 10mb, it will not be cached. Secondly the headers are checked to ensure the content requested is cache-able. The cache is not for storing large files, each service is limited at 100mb.
The cache honors backend's "Expires", "Cache-Control: no-cache", and "Cache-Control: max-age=XXX" headers. We do not handle "Vary" headers when caching. In order to ensure private items are not served to all users unintentionally by the cache, the back-end can set "no-cache" or "max-age=0". \ The following response headers flag a response as uncacheable:
Cache-Control containing "no-cache", "no-store", "private", or a "max-age" with a non-numeric or 0 value
Expires with a time in the past
It optionally possible to define a redirect for a matching HTTP Zone. In this situation any caching settings will not take effect.
Redirection URLs mat contain the following variables:
$scheme - The requested scheme (e.g "http" or "https")
$host - The requested domain name
$url - The path and query string component of a request, including the leading slash
For example, it is possible to redirect all requests to the https version of your site with a rule such as the following:
HTTP Zones can contain spaces
HTTP Zones cant match double forward slashes, this is in turn with how most browsers send requests anyway.
Caching does not impact bandwidth costs, cached requests are billed as if they are fetched from your server. This is subject to change when we get around to implementing it.