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HTTP Service

The MongoDB Realm HTTP Service is a generic interface that enables you to communicate with any service that is available over HTTP, such as those that provide a REST API. This is useful when you need to use a service that does not have a custom service built-in to MongoDB Realm.

You will need to provide values for the following parameters when you create an HTTP service interface:

ParameterDescription
Service Name
config.name
The name of this HTTP service interface. This must be unique from all other service interfaces in your application.

The HTTP service in Realm provides the following actions that you can call in functions and in the SDKs. Each action maps to a standard HTTP request method.

For instructions on using an HTTP service action, see Call a Service Action.

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You must enable a service action in a service rule before you can call it.

ActionDescription
http.get()Send an HTTP GET request.
http.post()Send an HTTP POST request.
http.put()Send an HTTP PUT request.
http.patch()Send an HTTP PATCH request.
http.delete()Send an HTTP DELETE request.
http.head()Send an HTTP HEAD request.

You will need to provide values for the following parameters when you configure an HTTP incoming webhook:

Configuration ValueDescription
Webhook Name
name

Required. The name of the webhook.

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Each incoming webhook in an HTTP service interface must have a unique name.

Respond With Result
respond_result
Required. If true, MongoDB Realm sends a response to the client that called the webhook. The response body will be the return value of the webhook function.
Run Webhook As
run_as_user_id
run_as_user_id_script_source

Optional. The id of the Realm user that executes the webhook function when the webhook is called.

There are three ways to configure the execution user:

  • System: The execution user is the system user, which has full access to MongoDB CRUD and Aggregation APIs and is not affected by any rules, roles, or permissions.
  • User Id: You select a specific application user to execute the function.
  • Script: You define a function that returns the id of the execution user.
HTTP Method
options.httpMethod

The HTTP method that incoming webhook requests should use. You can configure a webhook to accept any method or specify a specific method. The following methods are supported:

  • GET
  • POST
  • PUT
  • PATCH
  • DELETE
  • HEAD
  • ANY
Request Validation
options.validationMethod

The request validation method incoming requests should use. The following validation types are supported:

Secret
options.secret
If Request Validation is enabled, this is the validation secret.

Realm automatically passes a payload document as the first argument to incoming webhook functions. In an HTTP Service incoming webhook the payload object represents an incoming HTTP request and has the following form:

{
"query": <query parameters>,
"headers": <request headers>,
"body": <request body (BSON)>
}
FieldDescription
query

A document where each field corresponds to a query parameter that the external service included in the webhook URL.

Beaker IconExample

A request sent to a webhook URL with the query parameters someParameter=42&anotherParameter=hello would have the following query document:

"query": {
"someParameter": 42,
"anotherParameter": "hello"
}
headers

A document where each field corresponds to an HTTP header that the external service included in the webhook URL.

Beaker IconExample

A request sent to a webhook URL with a Content-Type: application/json header would have the following headers document:

"headers": {
"Content-Type": ["application/json"]
}
body

A BSON.Binary object encoded from the request body. You can access the request body by serializing the binary object to a string and then parsing the string to EJSON:

const body = EJSON.parse(payload.body.text())

The following webhook function inserts incoming data into a MongoDB collection and returns the insertedId in the response body.

exports = function(payload, response) {
const mongodb = context.services.get("mongodb-atlas");
const requestLogs = mongodb.db("test").collection("requestlogs");
requestLogs.insertOne({
body: EJSON.parse(payload.body.text()),
query: payload.query
}).then(result => {
response.setStatusCode(201);
response.setBody(result.insertedId);
})
};
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