Help Center/ Video On Demand/ API Reference/ Media Asset Pre-loading/ CDN Pre-loading
Updated on 2025-11-26 GMT+08:00
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CDN Pre-loading

Function

After a media asset is published, you can call this API to pre-load it to CDN by specifying its ID or URL. When a user requests the asset for the first time, CDN serves the content directly, reducing cache warm-up latency and improving user experience. One tenant can pre-load a maximum of 1,000 media assets per day.

Authorization Information

Each account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions. For details about the required permissions, see Permissions Policies and Supported Actions.

URI

POST /v1.0/{project_id}/asset/preheating

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

No

String

User token. This parameter is mandatory when token authentication is used.

It can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is the user token.

Authorization

No

String

Authentication information. This parameter is mandatory for AK/SK authentication.

X-Sdk-Date

No

String

Time when a request is sent. This parameter is mandatory for AK/SK authentication.
Table 3 Request body parameters

Parameter

Mandatory

Type

Description

asset_id

No

String

ID of a published media asset.

urls

No

Array of strings

Streaming URL list of published media assets. A maximum of 10 URLs can be preloaded at a time.

Response Parameters

Status code: 202

Table 4 Response body parameters

Parameter

Type

Description

task_id

String

Pre-load task ID.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_code

String

Error code.

error_msg

String

Error description.

Example Requests

  • This example pre-loads media asset by media asset ID.

    POST https://{endpoint}/v1.0/{project_id}/asset/preheating

Content-Type: application/json

{
  "asset_id": "f488337c31c8e4622f1590735b134c65"
}

  • This example pre-loads media assets by media asset URL.

    POST https://{endpoint}/v1.0/{project_id}/asset/preheating

Content-Type: application/json{  "urls": [    "    https://example.com/asset/9db42f5e08c15edecd99a98da241994a/313bfd52a75f95ff48e8bf02eca2ab20.flv",    "    https://example.com/asset/9e455adb02295aa123809e8dc7ca51c1/68b1241af3bf58bcde9914626e07f5af.mp4",    "    https://example.com/asset/9e455adb02295aa123809e8dc7ca51c1/play_video/68b1241af3bf58bcde9914626e07f5af_H.264_480X270_HEAACV1_300.mp4"  ]}

Example Responses

Status code: 202

Returned when the request succeeded.

{
  "task_id" : "5199337c31c8e4622f1590735b13a263"
}

Status code: 400

Returned when the request failed.

{
  "error_code" : "VOD.10053",
  "error_msg" : "The request parameter is illegal, illegal field: {xx}."
}

Status Codes

Status Code

Description

202

Returned when the request succeeded.

400

Returned when the request failed.

Error Codes

See Error Codes.

Parent topic: Media Asset Pre-loading