By default, CDN back-to-origin uses the acceleration domain and the port requested by the client when sending origin requests. If you need to customize the server domain name and the back-to-origin port used in CDN origin requests, you can do so by configuring Origin Request HOST and Origin Request Port.

Difference Between Origin Server and Origin Request HOST

• Origin Server: The origin server is where your business content is stored. It determines the specific IP address used during the back-to-origin process.
• Origin Request HOST: If your origin server hosts multiple services, you can use the origin request HOST value to distinguish among them. The CDN includes the configured Origin HOST value in the request header sent to the origin. This determines which site or service is accessed on that IP address.

How to Set Origin Request Host and Origin Request Port

You can configure these settings from several entry points.

Entry Point 1

1. Log in to the Atomile Console and select the appropriate product.
2. Go to Configuration, locate the domain you want to configure, and click
3. Find Origin Settings > Host Header and Port, and then configure Origin Request Port and Origin Request HOST.

Entry Point 2

1. Log in to the Atomile Console and select the appropriate product.
2. Go to Configuration, locate the domain you want to configure, and click or Batch Edit Origin, and then configure Origin Request Port and Origin Request HOST.

Parameter Description

Parameter	Description	Example
Origin Request Port	If this parameter is not configured, the original request port is used for origin reqeust by default. This setting applies to the port used for the basic origin. If you need to configure the origin request port for advanced origin, contact Atomile technical support.	8141
Origin Request HOST	If your origin server hosts multiple services, you can use the origin request HOST value to distinguish among them.	www.test.com

After completing the configuration, click OK, and then click Next to submit your settings. To minimize potential disruption to your production environment, we strongly recommend performing a Pre-deploy test in a staging environment. This important step ensures that your configuration is correct before it goes live.

After you confirm that the settings are correct, click Deploy Now to apply them in the live environment. The configuration typically takes effect within 3 to 5 minutes. For more information about pre-deployment testing and validation, refer to Deploy the Configurations to Staging Environment for Validation.

Best Practices

Assume the acceleration domain uses www.0011.com as the back-to-origin domain name, www.test.com as the Origin Request HOST, and 8141 as the Origin Request Port.

If a user requests the resource using the URL http://<acceleration-domain>/test.jpg and the CDN does not have the resource cached, the CDN resolves the back-to-origin domain name www.0011.com to obtain the origin server address. Assume the resolved origin IP address is 1.1.1.1.

The CDN then sends the origin request to 1.1.1.1 using port 8141 and includes www.test.com in the request header. As a result, the origin server locates and returns the test.jpg file under www.test.com to the CDN, which then delivers it to the user.

Notes

This back-to-origin request port setting applies only to the basic origin. If you need to configure the origin request port for advanced origin, contact Atomile technical support.