Feature Overview

If the 301/302 request following feature is enabled, when CDN receives a 301 or 302 status code from an origin server, CDN server will send another request to obtain the contents specified in the Location header from the 301/302 response returned by the origin server previously, and eventually give the contents to clients instead of directly passing the 301/302 response. This simplifies request processing and improves user experience because fewer interactions are required between the client and the CDN edge node.

Application Scenarios

The 301/302 response is enabled on your origin server for specific contents, and you expect CDN POPs to fetch the content specified by the URL in the Location response header returned from the origin server along with 301/302 response. After CDN POPs receive the content with 200 http status code, CDN will give it to clients and store it in cache.

Additional Considerations

Before you configure 301/302 redirect for an accelerated domain name, determine whether an origin host is used for 301/302 redirect.

(Default) Scenario 1: The origin server returns responses with the 301/302 status code and the Location header to CDN POPs, and you want the value of the Location header returned by the origin server to be used as the value of the Host request header for obtaining the content at the address that is specified by the Location response header. In this case, you do not need to specify an origin host.
Scenario 2: The origin server returns responses with the 301/302 status code and the Location header to CDN POPs, and you want to use the origin host that you configure for the accelerated domain name as the value of the Host header in the requests that CDN POPs send to obtain the content at the address specified by the Location response header. In this case, you need to confirm that the origin host is configured, and you also need to specify the origin host that you want to use for 301/302 redirect in the ticket for configuring 301/302 redirect.

Maximum 301/302 redirects: The maximum number of 301/302 redirects that a CDN POP can perform to obtain the requested content after it receives the 301/302 status code from the origin server. If you configure the maximum number of 301/302 redirect retries to 1, a CDN POP requests the content at the address (Address A) that is specified by the Location header after it receive the 301/302 status code from the origin server. If the CDN POP receives the 301/302 status code again, it does not send a request to obtain the content at the address (Address B) that is specified by the Location header in the second response.

Procedure

Log in to the CDN console.
On the Domain List page, find the target domain name, and click Edit in the Actions column.
Click Back-to-origin .
Click the Configurations tab and enable 301/302 Redirect.
Click save and submit button.

Content Delivery Network

301/302 request following