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Mocks Server Plugin Proxy

Plugin for Mocks Server that provides a variant handler that proxy requests to another host and pass response back to original caller.

It uses the express-http-proxy package under the hood, and supports all of its options.

Important: From v3.0.0, this plugin includes two route handlers: proxy and proxy-v4. This was made to allow Mocks Server v3 users to progressively adapt their code to Mocks Server v4 without breaking changes. It is strongly recommended to use the proxy-v4 handler. In the next major release, backward compatibilty will be removed and the proxy handler will be replaced by proxy-v4.

Usage of proxy-v4 handler

This plugin is included in the main distribution of the Mocks Server project, so you can also read the official documentation website.

Proxy routes

If you want a route variant to use the proxy-v4 handler, define its handler property as "proxy-v4". Use the host property to set the host for the route, and the options property to set any of the express-http-proxy options.

module.exports = [
  {
    id: "proxy-all",
    url: "*",
    method: ["GET", "POST", "PATCH", "PUT"],
    variants: [
      {
        id: "proxy-to-google",
        type: "proxy-v4", // This route variant will use the "proxy" handler from this plugin
        options: {
          host: "https://www.google.com", // proxy host
          options: {}, // Options for express-http-proxy
        },
      },
    ],
  },
];

Options

Here are listed the specific properties that can be defined in a proxy-v4 route variant. They must be defined in the options property of the variant:

• host (String|Function): The proxy host. Equivalent to the express-http-proxy host option, so it can also be a function.
• options (Object): Object containing any of the options supported by the express-http-proxy package. Some of them are:
  • filter (Function): filter option for express-http-proxy.
  • userResDecorator (Function): userResDecorator option for express-http-proxy.
  • ... all other express-http-proxy options are also supported.

Tip: Note that the variant delay option is still valid for routes handled by this plugin, so you can use it to simulate that host responses are slow.

Usage of proxy handler

Proxy routes

If you want a Mocks Server v3 route variant to use the proxy handler, define its type property as "proxy". Use the host property to set the host for the route, and the options property to set any of the express-http-proxy options.

module.exports = [
  {
    id: "proxy-all",
    url: "*",
    method: ["GET", "POST", "PATCH", "PUT"],
    variants: [
      {
        id: "proxy-to-google",
        type: "proxy", // This route variant will use the "proxy" handler from this plugin
        host: "https://www.google.com", // proxy host
        options: {}, // Options for express-http-proxy
      },
    ],
  },
];

Route variant options

Mocks server common properties to all route handlers are in cursive. Specific properties of this plugin are in bold:

• host (String|Function): The proxy host. Equivalent to the express-http-proxy host option, so it can also be a function.
• options (Object): Object containing any of the options supported by the express-http-proxy package. Some of them are:
  • filter (Function): filter option for express-http-proxy.
  • userResDecorator (Function): userResDecorator option for express-http-proxy.
  • ... all other express-http-proxy options are also supported.

Tip: Note that the delay option is still valid for routes handled by this plugin, so you can use it to simulate that host responses are slow.