HTTP API Reference for Momento Topics
Momento provides an HTTP API interface for your applications that can’t use our SDKs or for ones that prefer to use things like curl or fetch. For example, when deploying to edge compute services like Cloudflare Workers, Fastly Compute@Edge, etm. this API is for you. Be aware that most other applications should likely use Momento’s SDK clients.
You can also view the Open API Specification in our public workspace in Postman.
This documentation does not describe how to implement HTTP request syntax as that is different and unique to each language you might use.
Authentication
For each connection, you will need a Momento auth token generated via the Momento console or a token "vending machine" microservice you host. Momento auth tokens control access to the Momento services and can be set to expire and grant/restrict access to specific resources.
Regions
To access the Momento HTTP API, use one of the following endpoints in the region of your API token and cache.
If you do not see a Region you require, let’s talk. Please contact Support.
Publish
Publishes a message to a topic.
Request
- Path: /topics/{cacheName}/{topicName}
- HTTP Method: POST
Body
- Content-Type: octet-stream
- The body of the request should contain the binary value to be published to the topic.
Path Parameters
| Parameter name | Required? | Type | Description |
|---|---|---|---|
| cacheName | yes | URL-safe string | The name of the cache containing the topic. |
| topicName | yes | URL-safe string | Name of the topic to publish to. |
Query Parameters
| Parameter name | Required? | Type | Description |
|---|---|---|---|
| token | no** | URL-safe string | The Momento auth token, in string format, to be used for authentication/authorization of the request. |
*** You must provide a Momento auth token to be used for authentication/authorization of the request. This may be passed either as the token query parameter or as the Authorization header.
Headers
| Header name | Required? | Type | Description |
|---|---|---|---|
| Authorization | no** | URL-safe string | The Momento auth token, in string format, is used for authentication/authorization of the request. |
** You must provide a Momento auth token to be used for authentication/authorization of the request. This may be passed either as the token query parameter or as the Authorization header.
Responses
Success
Status Code: 204 No Content
- The message was successfully published to the provided topic
Error
Status Code: 400 Bad Request
- This error type typically indicates that the request was incorrectly specified. See the message body for further details.
Status Code: 401 Unauthorized
- This error type typically indicates that the Momento auth token passed in is either invalid or expired. See the body of the message for further details.
Status Code: 403 Forbidden
- This error type typically indicates the Momento auth token passed in does not grant the required access to the resources you attempted. See the body of the message for further details.
Status Code: 404 Not Found
- “Cache Not Found” indicates that the specified cache does not exist.
Status Code: 429 Too Many Requests
- This error type typically indicates that account limits were exceeded. See the message body for further details, or contact Momento support to request a limit increase.
Status Code: 500 Internal Server Error
- This error type typically indicates that the service is experiencing issues. Contact Momento support for further assistance.
Examples
Publish
Below is an example that publishes the value hello world! to the example topic in the my-cache cache in the us-east-1 region.
Token provided in query parameter:
curl -X POST -d 'hello world!' "https://api.cache.cell-us-east-1-1.prod.a.momentohq.com/topics/my-cache/example?token=<token>"
Token provided as Authorization header:
curl -X POST -H "Authorization: <token>" -d 'hello world!' "https://api.cache.cell-us-east-1-1.prod.a.momentohq.com/topics/my-cache/example"