SimpleCDN Documentation & Help
Pay Per File Content Delivery Network (PPF-AutoCDN)
The SimpleCDN Pay Per File Auto Content Delivery Network (PPF-AutoCDN) is easy to use, and automatically offloads your files form your web server for lifetime storage and unlimited delivery for a single one-time fee per file.
To use the AutoCDN service, simply create an AutoCDN Folder from the SimpleCDN Web-based Manager.
Each AutoCDN Folder you create will hold content from specific domain names that you specify.
Each AutoCDN Folder you create will hold content from specific domain names that you specify.
To automatically offload and serve content from SimpleCDN, simply prepend your absolute image, css, download, javascript, etc. links with the link to your AutoCDN folder.
http://dl<your-account-id>.simplecdn.com/autocdn/ <your-autocdn-folder>/<absolute-link-to-content-on-your-site>
Original Image: http://www.cowfacts.com/bigcow.jpg 
In this example, the website http://www.cowfacts.com contains a single image, which is bigcow.jpg. However, the link to the bigcow.jpg image is prepended with the link to the AutoCDN Folder cowfolder. The cowfolder was created to allow all content from the domain www.cowfacts.com to be offloaded.
On the initial request for bigcow.jpg, AutoCDN will instruct the browser to download the file from the original web server until the file is automatically offloaded to the SimpleCDN Content Delivery Network (usually about 60 seconds). Then, requests for bigcow.jpg will be directed to the SimpleCDN Content Delivery Network, instead of to your web server.
By including a single javascript reference in the header of a web page, calls to IMG, A, OBJECT and EMBED elements will instead be made to SimpleCDN automatically.
HTML files, elements with query strings and dynamic elements will never be directed to SimpleCDN using this method.
The AutoCDN Absolute Link Prepending method must be used to offload css, javascript files, etc. to SimpleCDN.
AutoCDN will offload both HTTP and HTTPS links.
AutoCDN will offload any static file in any size from your webserver.
AutoCDN will keep the last version of a deleted source file available on the SimpleCDN Content Delivery Network.
Once your file is on AutoCDN, you *may* delete the source file on your server, and AutoCDN will contine to serve the most recent file in its cache forever (or until you deactivate the folder).
AutoCDN will look for changes to your source files on your web server, and update any changed files on the SimpleCDN Content Delivery Network free of charge.
This is done with a HEAD request, looking for a changed ETag value.
AutoCDN will send a HEAD request every few minutes (for small files) to every few hours (for large files), and will re-download your file if it has changed, free of charge.
Files that have increased in size will be charged for the increased file size only.
Cowfacts Image Example Page: http://www.cowfacts.com
AutoCDN will download files from more than one server at a time, drastically speeding up the loading time of any webpage.
SimpleCDN's distributed architecture maintains a real-time DNS snapshot of the global Internet. This allows SimpleCDN to respond to CNAME DNS requests in near real-time (depending on your DNS server's cache settings).
To create your own CNAME DNS entry for your SimpleCDN Download Server, simply follow the instructions below:
To create your own CNAME DNS entry for your SimpleCDN Download Server, simply follow the instructions below:
1 - Create CNAME DNS Entry for your new domain on your DNS server.
cdn.mydomain.com CNAME dl<your-account-id>.simplecdn.com2 - Wait 5-10 minutes for your DNS server cache to update.
3 - Use your new CNAME in all SimpleCDN download links.
http://cdn.mydomain.com/<your-file-name>Notes:
Only HTTP requests are allowed, as HTTPS requests with your CNAME will throw SSL certificate errors to the browser.
Unlimited CNAME records are allowed per account.
You may use your CNAME in place of the
dl<your-account-id>.simplecdn.com name for ALL HTTP requests, including images, audio, video, etc.
All SimpleCDN download domains may be accessed using a simple alias pattern, allowing multiple simultaneous requests to be executed by web browsers.
Simply add a dash, and then any integer after the second-level part of your download domain to create an instant alias domain.
Note:
Browsers will not cache the same content across different domains... be sure to always link the same file to the same download domain, to take advantage of browser caching and expire/cache-control headers to provide a faster browsing experience.
Simply add a dash, and then any integer after the second-level part of your download domain to create an instant alias domain.
Original Domain:
dl1.simplecdn.comAlias Domains:
dl1-1.simplecdn.comdl1-5.simplecdn.comdl1-9.simplecdn.comExamples:
Note:
Browsers will not cache the same content across different domains... be sure to always link the same file to the same download domain, to take advantage of browser caching and expire/cache-control headers to provide a faster browsing experience.