Prefetches content from origin servers to L2 nodes of Alibaba Cloud Content Delivery Network (CDN). This reduces loads on origin servers because users can directly hit cache upon their first visits.

Note
  • Alibaba Cloud CDN supports POST requests in which parameters are sent as a form.
  • You can call the RefreshObjectCaches operation to refresh content and call the PushObjectCache operation to prefetch content.
  • You can specify at most 100 URLs in each prefetch request. Each Alibaba Cloud account can submit at most 500 URLs per day. If your daily peak bandwidth exceeds 500 Mbit/s, you can submit a ticket to request a quota increase. Alibaba Cloud determines whether to approve your application based on your business requirements.
  • For each Alibaba Cloud account, the prefetch queue can contain up to 100 prefetch requests. Content is prefetched based on the time when the prefetch requests are submitted. The request that is submitted the earliest has the highest priority to prefetch content. If the number of prefetch requests in the queue reaches 100, you cannot submit more prefetch requests until the number drops below 100.
  • L2 CDN nodes are deployed between L1 CDN nodes and origin servers to reduce loads on the origin servers.
  • The maximum number of times that each user can call this operation per second is 50.
  • For more information about how to automate refresh or prefetch tasks, see Prefetch and refresh task scripts.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer. OpenAPI Explorer dynamically generates the sample code of the operation for different software development kits (SDKs).

Request parameters

Parameter Type Required Example Description
Action String Yes PushObjectCache

The operation that you want to perform. Set the value to PushObjectCache.

ObjectPath String Yes abc.com/image/1.png\nabc.com/image/2.png

The URLs from which content is prefetched. Format: accelerated domain name/files to be prefetched.

Note Separate multiple URLs with line feeds (\n or \r\n). Each object path can be up to 1,024 characters in length.
Area String No domestic

The accelerated region where content is to be prefetched. Valid values:

  • domestic: accelerated regions in mainland China.
  • overseas: accelerated regions outside mainland China.

If you do not set this parameter, content in the accelerated region of the domain name is prefetched. The rules are:

  • If the accelerated region is set to "Mainland China Only", content in regions in mainland China is prefetched.
  • If the accelerated region is set to "Global", content in all regions are prefetched.
  • If the accelerated region is set to "Global (Excluding Mainland China)", content in regions outside mainland China is prefetched.

Response parameters

Parameter Type Example Description
PushTaskId String 9524xxxx

The ID of the prefetch task. If multiple tasks are returned, the IDs are separated with commas (,).

RequestId String 16A96B9A-F203-4EC5-8E43-CB92E68F4CD8

The ID of the request.

Examples

Sample requests

http(s)://cdn.aliyuncs.com/?Action=PushObjectCache
&ObjectPath=abc.com/image/1.png\nabc.com/image/2.png
&<Common request parameters>

Sample success responses

XML format 

<PushObjectCacheResponse>
    <PushTaskId>9524xxxx</PushTaskId>
    <RequestId>16A96B9A-F203-4EC5-8E43-CB92E68F4CD8</RequestId>
</PushObjectCacheResponse>

JSON format 

{
  "PushTaskId": "9524xxxx",
  "RequestId": "16A96B9A-F203-4EC5-8E43-CB92E68F4CD8"
}

Errors

For a list of error codes, visit the API Error Center.