The Pull Protocol option allows setting the protocol which CDN servers will use to pull content from an origin server. This parameter can be MATCH, HTTP and HTTPS. Choose the mode depending on the default protocol of your origin server to avoid possible issues. Let us look at several examples.
Сontent available through one protocol
For example,
- Сontent is available through HTTPS (443 port)
- Pull protocol is set to HTTP (80 port)
Origin redirects from HTTP to HTTPS
How it works
- A user requests content from a CDN at http://cdn.example.com/image.jpg.
- The CDN pulls from an origin source at http://example.com/image.jpg.
- The origin redirects to https://example.com/image.jpg.
- The user gets the content from the origin, not from the CDN.
Choose the HTTPS mode to have your content delivered through a CDN. If your content is available though HTTP, choose the HTTP mode.
No redirection at the origin
How it works
- A user requests content from a CDN at http://cdn.example.com/image.jpg.
- The CDN pulls from an origin source at http://example.com/image.jpg.
- The origin cannot provide any content because it can take content only at https://exmple.com/image.jpg.
Choose the HTTPS mode to have your content delivered through a CDN. If your content is available only through HTTP, choose the HTTP mode.
The origin source delivers content via both HTTP and HTTPS
Choose the Match mode. It means that a CDN server will use the protocol depending on client’s request.
- When the user sends a request to https://cdn.example.com/image.jpg, a CDN node delivers content from the origin through HTTPS (443 port)
- When the user sends a request to http://cdn.example.com/image.jpg, a CDN node delivers content from the origin through HTTP (80 port)