Origin pull protocol
Use the Origin Pull Protocol option to set the protocol which CDN servers will use to pull content from an origin server: HTTP, HTTPS or HTTP and HTTPS.
Select Origin pull protocol, depending on which protocol the origin server uses to send the content.
HTTP - if the content on the origin server is available only via HTTP (port 80) or there is a redirect from HTTPS to HTTP on the origin server.
HTTPS - if the content on the origin server is available only via HTTPS (port 443) or here is a redirect from HTTP to HTTPS on the origin server.
HTTP and HTTPS - if the content on the origin server is available via both HTTPS and HTTP. It means that a CDN server will use the protocol depending on the client’s request.
- Files are cached on a CDN server for both protocols. There will be two versions of the file in the cache: one for HTTP, the other for HTTPS.
- When the user sends a request to https://cdn.example.com/image.jpg, a CDN server delivers content from the origin through HTTPS (443 port).
- When the user sends a request to http://cdn.example.com/image.jpg, a CDN server delivers content from the origin through HTTP (80 port).
To show the logic of the Origin Pull Protocol option and what will happen if an incorrect value is set, consider an example:
Your origin server only delivers content through HTTPS (port 443), but in the Origin Pull Protocol option HTTP protocol (80 port) is specified.
Depending on whether a redirection is configured on the origin server or not, the client will receive or not receive content.
1. Origin redirects from HTTP to HTTPS
- 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.
Conclusion: the user gets the content from the origin, not from the CDN. Choose the HTTPS value to have your content delivered through a CDN.
2. Origin does not redirect from HTTP to HTTPS
- 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.
Conclusion: the origin cannot provide any content because it can take content only at https://example.com/image.jpg. Choose the HTTPS value to have your content delivered through a CDN.
Pull content from
Here you can specify an origin that CDN uses to pull the content from.
The origin can be the IP address or your site domain.
If you want to change the current origin, click Change Group.
You can also add an origin group by clicking Add Group.
Note! When you add an origin group from the resource settings, it is not automatically assigned to the resource. It should be manually selected from the list.
Read more about how to edit and to add origin group