CMQ can publish the message text of a topic and deliver it to the subscribed queue, so consumers can read it from the queue.
CMQ can push topic messages to the subscribed HTTP endpoint by sending POST requests. The message can be in JSON or SIMPLIFIED format.
Content-type
is text/plain
.msgId
will be delivered to the subscriber in the HTTP request header.If the HTTP service of the subscriber returns a standard 2xx response code (such as 200), the delivery succeeded; otherwise, the delivery failed, and the delivery retry policy has been triggered. If no response is returned after the timeout period elapses, CMQ will also consider the request as a failure and trigger the delivery retry policy. The detection timeout period is about 15 seconds.
Parameter Name | Description |
---|---|
x-cmq-request-id | requestId of the current push message |
x-cmq-message-id | msgId of the current push message |
x-cmq-message-tag | Tag of the current push message |
The body of an HTTP request in JSON format contains the message body and attribute information.
Parameter Name | Type | Description |
---|---|---|
TopicOwner | String | APPID of the owner of the subscribed topic |
topicName | String | Topic name |
subscriptionName | String | Subscription name |
msgId | String | Message ID |
msgBody | String | Message body |
publishTime | Int | Message published time |
The body of an HTTP request in SIMPLIFIED format is the message body published by the publisher.
If a 2xx response code is returned, the HTTP service of the subscriber has normally processed the delivered message; if another response code is returned or no response is returned after the timeout period elapses, an error will be reported, and the delivery retry policy will be triggered.
In this sample, the subscribed HTTP endpoint is http://test.com/cgi
.
JSON format:
POST /cgi HTTP/1.1
Host: test.com
Content-Length: 761
Content-Type: text/plain
User-Agent: Qcloud Notification Service Agent
x-cmq-request-id: 2394928734
x-cmq-message-id: 6942316962
x-cmq-message-tag: a, b
{"TopicOwner":100015036,"topicName":"MyTopic","subscriptionName":"mysubscription","msgId":"6942316962","msgBody":"test message","publishTime":11203432}
SIMPLIFIED format:
POST /cgi HTTP/1.1
Host: test.com
Content-Length: 123
Content-Type: text/plain
User-Agent: Qcloud Notification Service Agent
x-cmq-request-id: 2394928734
x-cmq-message-id: 6942316962
x-cmq-message-tag: a, b
test message
The following is a message subscription demo, where all messages are delivered in the POST method; therefore, you only need to rewrite the do_POST
method.
This sample will print the received HTTP POST request content and deserialize post data json
to traverse the printed request data.
#!/usr/bin/python
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
import json
class TestHTTPHandle(BaseHTTPRequestHandler):
def do_POST(self):
content_len = int(self.headers.getheader('content-length',0))
post_body = self.rfile.read(content_len)
print "receive cmq topic publisher request:"
print self.headers
print post_body
post_data = json.loads(post_body)
for k,v in post_data.iteritems():
print "key:%s value:%s" % (k,v)
#response http status 200
self.send_response(200)
self.end_headers()
self.wfile.write('ok')
def start_server(port):
http_server = HTTPServer(('0.0.0.0', int(port)),TestHTTPHandle)
http_server.serve_forever()
if __name__ == '__main__':
start_server(80)
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