Back-to-source settings
| Function | Description | Default |
| Source host | Specifies the host domain name that a CDN node will access in the back-to-source process. Three options are available: CDN domain, original site domain name, and custom domain name. | CDN domain name |
| Back-to-source with the same protocol | Back-to-source requests for resources use exactly the same protocol as used by the client to request the resources. | Disabled |
Cache settings
| Function | Description | Default |
| Cache policy configuration | Customizes cache expiration rules for specified resources. | Disabled |
| Setting the HTTP Request Header | Sets an HTTP request header. Eight parameters are currently available for HTTP request header customization. | Disabled |
| Customizing the 404 page | Customizes the 404 page. Three options are available: default 404 page, public welfare 404 page, and custom 404 page. | Default 404 page |
Access control
| Function | Description | Default |
| Anti-leech | Configures a referer blacklist or whitelist to identify and filter visitors. | Disabled |
| URL authentication | Uses URL authentication methods to protect resources on an origin site. | Disabled |
| IP blacklist | Configures the access IP blacklist to identify and filter visitors. | Disabled |
Performance optimization
| Function | Description | Default |
| Page optimization | Compresses and removes useless blank lines and carriage return characters to effectively reduce the page size. | Disabled |
| Smart compression | Supports smart compression for content in multiple formats to effectively reduce the size of user transmitted content. | Disabled |
| Filter parameter | Removes parameters after ? in a URL request during the back-to-source process. | Disabled |
Video-related settings
| Function | Description | Default |
| Back-to-source of range | Allows a user to notify an origin site server to return partial content within a specified range. This function helps with accelerated delivery of large files. | Disabled |
| Drag/drop playback | Enables random drag or drop playback in a video or audio on-demand scenario. | Disabled |
Other settings
| Function | Description | Default |
| Set httpDNS | Provides a DNS service by using the HTTP protocol to directly access the server of Alibaba Cloud CDN. | Disabled |