PreloadVodObjectCaches - ApsaraVideo VOD - Alibaba Cloud Documentation Center

Prefetches resources from an origin server to L2 nodes. Users can directly hit the cache upon their first visits. This way, workloads on the origin server can be reduced.

Operation description

Note

This operation is available only in the China (Shanghai) region.

You can submit a maximum of 500 requests to prefetch resources based on URLs each day by using an Alibaba Cloud account. You cannot prefetch resources based on directories.

You can call the RefreshVodObjectCaches operation to refresh content and the PreloadVodObjectCaches operation to prefetch content.

Debugging

OpenAPI Explorer automatically calculates the signature value. For your convenience, we recommend that you call this operation in OpenAPI Explorer.

Debug

Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

Operation: the value that you can use in the Action element to specify the operation on a resource.
Access level: the access level of each operation. The levels are read, write, and list.
Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
- The required resource types are displayed in bold characters.
- If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
Condition Key: the condition key that is defined by the cloud service.
Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.

Operation	Access level	Resource type	Condition key	Associated operation
vod:PreloadVodObjectCaches	update	All Resources *	none	none

Request parameters

Parameter	Type	Required	Description	Example
ObjectPath	string	Yes	The URL of the file to be prefetched. Separate multiple URLs with line breaks (\n or \r\n).	vod.test.com/test.txt
Area	string	No	The acceleration region in which you want to prefetch content. If you do not specify a region, the value overseas is used. domestic: Chinese mainland overseas: outside the Chinese mainland	domestic
L2Preload	boolean	No	Specifies whether to prefetch content to POPs. Valid values: true: prefetches content to nodes that include L2 DCDN nodes. false: prefetches content to L2 POPs or L3 POPs.	true
WithHeader	string	No	The custom header for prefetch in the JSON format.	{ "Accept-Encoding": [ "gzip, deflate, br" ] }

Response parameters

Parameter	Type	Description	Example
	object
PreloadTaskId	string	The ID of the prefetch task. Separate multiple task IDs with commas (,).	9524****
RequestId	string	The ID of the request.	E5BD4B50-7A02-493A-*****-97B9024B4135

Examples

Sample success responses

JSONformat

{
  "PreloadTaskId": "9524****",
  "RequestId": "E5BD4B50-7A02-493A-*****-97B9024B4135"
}

Error codes

For a list of error codes, visit the Service error codes.

Change history

Change time	Summary of changes	Operation
2024-07-03	The Error code has changed. The request parameters of the API has changed	View Change Details

Common errors

The following table describes the common errors that this operation can return.

Error code	Error message	HTTP status code	Description
Throttling	Request was denied due to request throttling.	503	The error message returned because the request was denied due to throttling.
IllegalOperation	Illegal domain operate is not permitted.	403	The error message returned because the domain name is invalid.
OperationDenied	Your account does not open VOD service yet.	403	The error message returned because ApsaraVideo VOD has not been activated for your Alibaba Cloud account.
OperationDenied.Suspended	Your VOD service is suspended.	403	The error message returned because your Alibaba Cloud account has overdue payments. Add funds to your account. If you do not settle your overdue payments within 15 days, you must re-activate ApsaraVideo VOD after you settle all the overdue payments.
InvalidDomain.NotFound	The domain provided does not belong to you.	404	The error message returned because the domain name does not exist or does not belong to you.
InvalidDomain.Offline	The domain provided is offline.	404	The error message returned because the domain name has been disabled.
QuotaExceeded.Refresh	You’ve exceeded the prescribed refresh limits.	400	The error message returned because the number of requests to refresh or prefetch the content exceeds the upper limit on the current day.
PreloadQueueFull	Preload queue is full, please try again later!	403	The error message returned because the number of URLs of the files being prefetched has reached the upper limit. Try again later.
InvalidDomain.Configure_failed	Failed to configure the provided domain.	500	The error message returned because the system failed to configure the domain name and cannot refresh or prefetch the content.
MissingParameter	The input parameter “ObjectPath” that is mandatory for processing this request is not supplied.	400	The error message returned because the ObjectPath parameter is not specified.
InvalidObjectPath.Malformed	The specific value of parameter ObjectPath is malformed.	400	The error message returned because the value of the ObjectPath parameter is in an invalid format.
InvalidExtensiveDomain.ValueNotSupported	Extensive domain not supported.	400	The error message returned because the domain name contains a wildcard character.
InvalidObjectPath.Size.Malformed	The size of ObjectPath is bigger than 1000.	400	The error message returned because a maximum of 1,000 URLs of files can be prefetched at a time.