Mocking

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Looking for the plugin's configuration parameters? You can find them in the Mocking configuration reference doc.

Provide mock endpoints to test your APIs in development against your services. The Mocking plugin leverages standards based on the Open API Specification (OAS) for sending out mock responses to APIs. Mocking supports both Swagger 2.0 and OpenAPI 3.0.

Benefits of service mocking with the Kong Mocking plugin:

• Conforms to a design-first approach since mock responses are within OAS.
• Accelerates development of services and APIs.
• Promotes parallel development of APIs across distributed teams.
• Easily enable and disable the Mocking plugin for flexibility when testing API behavior.

This plugin can mock 200, 201, and 204 responses.

Note: The plugin requires a spec to work. Depending on the Kong Gateway deployment mode, set either the api_specification_filename or the api_specification parameter.

Behavioral Headers

Behavioral headers allow you to change the behavior of the Mocking plugin for the individual request without changing the configuration.

X-Kong-Mocking-Delay

The X-Kong-Mocking-Delay header tells the plugin how many milliseconds to delay before responding. The delay value must be between 0(inclusive) and 10000(inclusive), otherwise it returns a 400 error.

HTTP/1.1 400 Bad Request

{
    "message": "Invalid value for X-Kong-Mocking-Delay. The delay value should between 0 and 10000ms"
}

X-Kong-Mocking-Example-Id

The X-Kong-Mocking-Example-Id header tells the plugin which response example is used when the endpoint has multiple examples for a single status code.

OpenAPI 3.0 allows you to define multiple examples in a single MIME type. The following example has two candidate examples: Hao and Sasha.

paths:
  /query_user:
    get:
      responses:
        '200':
          description: A user object.
          content:
            application/json:
              examples:
                Hao:
                  value:
                    id: 10
                    name: Hao
                Sasha:
                  value:
                    id: 20
                    name: Sasha

Makes a request to choose a specific example to respond to:

curl -X GET http://HOSTNAME:8000/query_user -H "X-Kong-Mocking-Example-Id: Sasha"

Response:

{
    "id": 20,
    "name": "Sasha"
}

X-Kong-Mocking-Status-Code

By default, the plugin chooses the minimum status code that is defined in the corresponding method.

The X-Kong-Mocking-Status-Code header allows requests to change the default status code selection behavior by specifying a status code that is defined in the corresponding method.

paths:
  /ping:
    get:
      responses:
        '200':
          description: '200'
          content:
            application/json:
              example:
                message: '200'
        '500':
          description: '500'
          content:
            application/json:
              example:
                message: '500'

Makes a request to choose a specific status code to respond to:

curl -i -X GET http://HOSTNAME:8000/ping -H "X-Kong-Mocking-Status-Code: 500"

Response:

HTTP/1.1 500 Internal Server Error

{
    "message": "500"
}

See also

• inso CLI documentation