Scenario

This section describes the format of messages sent to HTTP or HTTPS endpoints. You can identify messages based on message types in the headers. HTTP/HTTPS message types include: subscription confirmation messages, notification messages, and subscription cancellation messages.

The header of an SMN HTTP/HTTPS message contains the following parameters: X-SMN-TOPIC-URN, X-SMN-MESSAGE-ID, X-SMN-MESSAGE-TYPE, and X-SMN-SUBSCRIPTION-URN.

**Table 1** HTTP/HTTPS header parameters
Parameter	Description
X-SMN-MESSAGE-TYPE	Indicates the message type, which can be: SubscriptionConfirmation Notification UnsubscribeConfirmation
X-SMN-MESSAGE-ID	Indicates the unique message ID.
X-SMN-TOPIC-URN	Indicates the URN of the topic to which the message belongs.
X-SMN-SUBSCRIPTION-URN	Identifies the subscription endpoint.

HTTP/HTTPS Subscription Confirmation Message Format

After you add an HTTP/HTTPS endpoint, SMN sends a subscription confirmation message to the subscriber. The message body is composed of JSON character strings. The subscriber must obtain the subscription URL (subscribe_url) to confirm the subscription. Table 2 describes the JSON strings in detail.

**Table 2** HTTP/HTTPS subscription confirmation message body
Parameter	Description
type	Indicates the message type, the value of which is SubscriptionConfirmation.
signature	Indicates the signature information. The signature includes the message, message_id, subscribe_url, timestamp, topic_urn, and type fields. For details about signature verification, see A.6.3 Message Signature Verification.
topic_urn	Indicates the URN of the topic to which the message belongs.
message_id	Indicates the unique message ID.
signature_version	Indicates the signature version, which is currently V1.
message	Indicates the message content.
subscribe_url	Indicates the URL to be accessed for subscription confirmation.
signing_cert_url	Indicates the certificate URL for generating the message signature.
timestamp	Indicates the time stamp when the message was initially sent.

The following is an example HTTP/HTTPS subscription confirmation message:

{
    "signature": "ViE96uGbBkl+S8eWqgebi5KdmRht2U8+Rs88yuyMHq1k4h3jUkcDZ6HCqTqdpJ8nrLcdqETyyEiOQyTszJdU05z+LhfE8jerCCdSbL4zeInVkydHh0kcCRWmORye0/EuQ/gLC1UIXwvUsqbUCPnBRhNFXOeXMOPPCzK+d04xjy4QHd1H/bHxgsY3AlTe0gCFT068Zru7OK6w9aQaY44mXnN3OWGmBmoHyFab5TRXLSQNz/9u/Vj646cQMMaI0PPQ30QzGYD0MtzgDZi12m8jMTHAnMkTEcbLaEgaqmaoEnATSpEcspFKNXv2skwk7rsVakMOISpMH3+qC6RzhETA2A==",
    "topic_urn": "urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic",
    "message_id": "d86c201092574e71a3ca85826652c58b",
    "signature_version": "v1",
    "type": "SubscriptionConfirmation",
    "message": "{\"enterpriseProjectId\": \"0\", \"eventTime\": \"2019-08-12 22:40:55.040632\", \"chargingMode\": \"postPaid\", \"cloudserviceType\": \"hws.service.type.bandwidth\", \"eventType\": 1, \"regionId\": \"region01\", \"tenantId\": \"057eefe55400d2742f8cc0017870ceef\", \"resourceType\": \"hws.resource.type.bandwidth\", \"resourceSpecCode\": \"19_bgp\", \"resourceSize\": 10, \"resourceId\": \"e091f1b1-08ef-4e2b-a27e-f85e4c19026a\", \"resouceSizeMeasureId\": 15, \"resourceName\": \"elbauto_2019_08_13_06_40_46\"}",
    "subscribe_url": "https://console.xxx.com/smn/subscription/unsubscribe?subscription_urn=urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic:653e212a43884f7188ca656c537e31ce",
    "signing_cert_url": "https://console.xxx.com/smn/SMN_region01_b3974c411807498bb532b3cd6cd65d91.pem",
    "timestamp": "2019-08-12T22:40:56Z"
}

HTTP/HTTPS Notification Message Format

After an HTTP/HTTPS subscriber confirms the subscription, the subscriber can receive notification messages published to the topic. The notification message body is composed of JSON character strings, which are described in Table 3.

**Table 3** HTTP/HTTPS notification message body
Parameter	Description
type	Indicates the message type, the value of which is Notification.
signature	Indicates the signature information. The signature includes the message, message_id, subject, timestamp, topic_urn, and type fields. If the subject field is empty, the signature is not verified. For details about signature verification, see A.6.3 Message Signature Verification.
subject	Message subject
topic_urn	Indicates the URN of the topic to which the message belongs.
message_id	Indicates the unique message ID.
signature_version	Indicates the signature version, which is currently V1.
message	Indicates the message content.
unsubscribe_url	Indicates the URL for canceling a subscription.
signing_cert_url	Indicates the certificate URL for generating the message signature.
timestamp	Indicates the time stamp when the message was initially sent.

The following is an example HTTP(S) notification message:

{
    "signature": "ViE96uGbBkl+S8eWqgebi5KdmRht2U8+Rs88yuyMHq1k4h3jUkcDZ6HCqTqdpJ8nrLcdqETyyEiOQyTszJdU05z+LhfE8jerCCdSbL4zeInVkydHh0kcCRWmORye0/EuQ/gLC1UIXwvUsqbUCPnBRhNFXOeXMOPPCzK+d04xjy4QHd1H/bHxgsY3AlTe0gCFT068Zru7OK6w9aQaY44mXnN3OWGmBmoHyFab5TRXLSQNz/9u/Vj646cQMMaI0PPQ30QzGYD0MtzgDZi12m8jMTHAnMkTEcbLaEgaqmaoEnATSpEcspFKNXv2skwk7rsVakMOISpMH3+qC6RzhETA2A==",
    "topic_urn": "urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic",
    "message_id": "d86c201092574e71a3ca85826652c58b",
    "signature_version": "v1",
    "type": "Notification",
    "message": "{\"enterpriseProjectId\": \"0\", \"eventTime\": \"2019-08-12 22:40:55.040632\", \"chargingMode\": \"postPaid\", \"cloudserviceType\": \"hws.service.type.bandwidth\", \"eventType\": 1, \"regionId\": \"region01\", \"tenantId\": \"057eefe55400d2742f8cc0017870ceef\", \"resourceType\": \"hws.resource.type.bandwidth\", \"resourceSpecCode\": \"19_bgp\", \"resourceSize\": 10, \"resourceId\": \"e091f1b1-08ef-4e2b-a27e-f85e4c19026a\", \"resouceSizeMeasureId\": 15, \"resourceName\": \"elbauto_2019_08_13_06_40_46\"}",
    "unsubscribe_url": "https://console.xxx.com/smn/subscription/unsubscribe?subscription_urn=urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic:653e212a43884f7188ca656c537e31ce",
    "signing_cert_url": "https://console.xxx.com/smn/SMN_region01_b3974c411807498bb532b3cd6cd65d91.pem",
    "timestamp": "2019-08-12T22:40:56Z"
}

HTTP/HTTPS Subscription Cancellation Message Format

After an HTTP/HTTPS subscription is canceled, the subscriber receives a subscription cancellation message sent by SMN. The message body is composed of JSON character strings, which are described in Table 4.

**Table 4** HTTP/HTTPS subscription cancellation message body
Parameter	Description
type	Indicates the message type, the value of which is UnsubscribeConfirmation.
signature	Indicates the signature information. The signature includes the message, message_id, subscribe_url, timestamp, topic_urn, and type fields. For details about signature verification, see A.6.3 Message Signature Verification.
topic_urn	Indicates the URN of the topic to which the message belongs.
message_id	Indicates the unique message ID.
signature_version	Indicates the signature version, which is currently V1.
message	Indicates the message content.
subscribe_url	Indicates the URL for a re-subscription.
signing_cert_url	Indicates the certificate URL for generating the message signature.
timestamp	Indicates the time stamp when the message was initially sent.

The following is an example HTTP(S) message for canceling a subscription:

{
    "signature": "ViE96uGbBkl+S8eWqgebi5KdmRht2U8+Rs88yuyMHq1k4h3jUkcDZ6HCqTqdpJ8nrLcdqETyyEiOQyTszJdU05z+LhfE8jerCCdSbL4zeInVkydHh0kcCRWmORye0/EuQ/gLC1UIXwvUsqbUCPnBRhNFXOeXMOPPCzK+d04xjy4QHd1H/bHxgsY3AlTe0gCFT068Zru7OK6w9aQaY44mXnN3OWGmBmoHyFab5TRXLSQNz/9u/Vj646cQMMaI0PPQ30QzGYD0MtzgDZi12m8jMTHAnMkTEcbLaEgaqmaoEnATSpEcspFKNXv2skwk7rsVakMOISpMH3+qC6RzhETA2A==",
    "topic_urn": "urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic",
    "message_id": "d86c201092574e71a3ca85826652c58b",
    "signature_version": "v1",
    "type": "UnsubscribeConfirmation",
    "message": "{\"enterpriseProjectId\": \"0\", \"eventTime\": \"2019-08-12 22:40:55.040632\", \"chargingMode\": \"postPaid\", \"cloudserviceType\": \"hws.service.type.bandwidth\", \"eventType\": 1, \"regionId\": \"region01\", \"tenantId\": \"057eefe55400d2742f8cc0017870ceef\", \"resourceType\": \"hws.resource.type.bandwidth\", \"resourceSpecCode\": \"19_bgp\", \"resourceSize\": 10, \"resourceId\": \"e091f1b1-08ef-4e2b-a27e-f85e4c19026a\", \"resouceSizeMeasureId\": 15, \"resourceName\": \"elbauto_2019_08_13_06_40_46\"}",
    "subscribe_url": "https://console.xxx.com/smn/subscription/unsubscribe?subscription_urn=urn:smn:region01:0553db98c800d5192f9bc01232b89622:vpc_status_report_topic:653e212a43884f7188ca656c537e31ce",
    "signing_cert_url": "https://console.xxx.com/smn/SMN_region01_b3974c411807498bb532b3cd6cd65d91.pem",
    "timestamp": "2019-08-12T22:40:56Z"
}

HTTP/HTTPS Message Format

Scenario

HTTP/HTTPS Subscription Confirmation Message Format

HTTP/HTTPS Notification Message Format

HTTP/HTTPS Subscription Cancellation Message Format