Message Service:Subscribe

Authorization

By default, only Alibaba Cloud accounts can call this operation. RAM users can call this operation only after these RAM users are granted related permissions. The following table describes the authorization information of this operation. For more information, see Permission policies and examples.

Description

• A subscription name can be up to 255 characters in length and contain letters, digits, and hyphens (-). It must start with a letter or digit.
• You must specify an endpoint when you create a subscription. Otherwise, the subscription is invalid.

Request

A request consists of the following parts:

• Request line

  PUT /topics/$TopicName/subscriptions/$SubscriptionName HTTP/1.1

• Operation-specific request headers

  None.

• Request body

  The request body is in the XML format. The request body includes the following parameters.

  Parameter	Type	Required	Example	Description
  Endpoint	String	Yes	http://example.com	The endpoint that the subscriber uses to receive messages. Syntax: acs:mns:{REGION}:{AccountID}:queues/{QueueName}.
  FilterTag	String	No	important	The tag that is used to filter messages. Only the messages that have the same tag can be pushed. A tag is a string that can be up to 16 characters in length. By default, no tag is specified to filter messages.
  NotifyStrategy	Boolean	No	BACKOFF_RETRY	The retry policy that is applied if an error occurs when MNS pushes messages to the endpoint. Valid values: BACKOFF_RETRY: retries with a fixed backoff interval. EXPONENTIAL_DECAY_RETRY: retries with exponential backoff. For more information, see NotifyStrategy. Default value: BACKOFF_RETRY.
  NotifyContentFormat	Boolean	No	SIMPLIFIED	The format of the message that is pushed to the endpoint. Valid values: XML JSON SIMPLIFIED For more information, see NotifyContentFormat. Default value: XML.

Response

A response consists of the following parts:

• HTTP status code

  HTTP/1.1 201

  In a topic, each subscription name must be unique. If you create a subscription that already exists, errors may occur. For example, if the parameters of two subscriptions are the same, the HTTP status code 204 is returned. If the parameters of the two subscriptions are different, the HTTP status code 409 is returned.

• Operation-specific response headers

  Parameter	Type	Example	Description
  Location	String	http://$AccountId.mns.cn-hangzhou.aliyuncs.com/topics/$TopicName/subscriptions/$SubscriptionName	The URL of the subscription that is created. Syntax: http://$AccountId.mns.cn-hangzhou.aliyuncs.com/topics/$TopicName/subscriptions/$SubscriptionName.

  For more information about common response headers, see Common parameters.

• Response body

  None.

Examples

Sample requests

PUT /topics/$TopicName/subscriptions/$SubscriptionName HTTP/1.1
Host: $AccountId.mns.cn-hangzhou.aliyuncs.com
Date: Tue, 08 Dec 2015 06:06:46 GMT
Authorization:MNS 15B4D3461F177624206A:xQE0diMbLRepdf3YB+FIEXA*****
x-mns-version: 2015-06-06

<?xml version="1.0" encoding="utf-8"?>
<Subscription xmlns="http://mns.aliyuncs.com/doc/v1/">
    <Endpoint>http://example.com</Endpoint>
    <NotifyStrategy>BACKOFF_RETRY</NotifyStrategy>
    <NotifyContentFormat>SIMPLIFIED</NotifyContentFormat>
    <FilterTag>important</FilterTag>
</Subscription>

Sample success responses

HTTP/1.1 201
x-mns-request-id:56667376B2B71C9C1600****
x-mns-version: 2015-06-06
Location: http://$AccountId.mns.cn-hangzhou.aliyuncs.com/topics/$TopicName/subscriptions/$SubscriptionName

Error codes