Simple Message Queue (formerly MNS):SendMessage

Authorization information

By default, you can use only an Alibaba Cloud account to call this operation. You can use a RAM user to call this operation only after you grant the required permissions to the RAM user. The following table describes the authorization information of this operation. For more information, see Permission policies and examples.

Usage notes

• You can call this operation to send a message to a queue. A standard message is immediately consumed after the message is sent to the queue. If you do not want the message to be immediately consumed, you can specify the DelaySeconds parameter when you send the message. If you set the DelaySeconds parameter to a value that is greater than 0, the initial status of the message is Delayed after the message is sent to a queue. The message cannot be consumed until the period specified by the DelaySeconds parameter ends and the status of the message changes toActive.

• If the value of the DelaySeconds parameter for the message is different from the value of the DelaySeconds parameter for the queue, the value of the DelaySeconds parameter for the message takes effect.

• Before you call this API operation to send a message, encode the message body by using Base64. This prevents unexpected errors due to special characters.

Request

A request consists of the following parts:

• Request line

  POST /queues/$queueName/messages HTTP/1.1

• Operation-specific request headers

  None.

• Request Body

  The request body is in the XML format and contains the parameters of the message.

  Parameter	Type	Required	Example	Description
  MessageBody	String	Yes	This is a test message	The body of the message.
  DelaySeconds	Integer	No	60	The delay period after which the message sent to the queue can be consumed. Valid values: 0 to 604800. Unit: seconds. Default value: 0.

Response

A response consists of the following parts:

• HTTP Status Code

  HTTP/1.1 201 Created

• Operation-specific response headers

  None.

• Response Body

  The response body is in the XML format. The MessageId and MessageBodyMD5 parameters of the message are returned.

  Parameter	Type	Example	Description
  MessageId	String	5F290C926D472878-2-14D9529A8FA-20000****	The ID of the message. The message ID is unique in the queue.
  MessageBodyMD5	String	C5DD56A39F5F7BB8B3337C6D11B6****	The MD5 hash of the message body.
  ReceiptHandle	String	1-ODU4OTkzNDU5My0xNDM1MTk3NjAwLTItNg==	The receipt handle that was returned after the delayed message was received.

Examples

Sample requests

POST /queues/$queueName/messages HTTP/1.1
Host: $AccountId.mns.cn-hangzhou.aliyuncs.com
Date: Wed, 18 Mar 2012 12:00:00 GMT
Content-Length:500
Content-Type:text/xml;charset=utf-8
x-mns-version: 2015-06-06
Authorization: MNS 15B4D3461F177624206A:xQE0diMbLRepdf3YB+FIEX****

<?xml version="1.0" encoding="UTF-8"?>
<Message xmlns="http://mns.aliyuncs.com/doc/v1/">
    <MessageBody>This is a test message</MessageBody>
    <DelaySeconds>60</DelaySeconds>
    <Priority>1</Priority>
</Message>            

Sample responses

HTTP/1.1 201 Created
Content-Length:120
Content-Type:text/xml;charset=utf-8
x-mns-request-id:512B2A634403E52B1956****
x-mns-version: 2015-06-06

<?xml version="1.0" encoding="UTF-8"?>
<Message xmlns="http://mns.aliyuncs.com/doc/v1/">
<MessageId>5F290C926D472878-2-14D9529****-200000001</MessageId>
<MessageBodyMD5>C5DD56A39F5F7BB8B3337C6D11B6****</MessageBodyMD5>
<ReceiptHandle>1-ODU4OTkzNDU5My0xNDM1MTk3NjAwLTItNg==</ReceiptHandle>
</Message>           

Error codes