WireMock Websocket: Everything You Need to Know

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Introduction

WireMock is an open-source tool for creating mock HTTP services that can simulate responses from APIs. It is widely used by developers to test their applications and APIs. Recently, WireMock has added support for WebSockets, which has made it even more powerful and useful. In this article, we will discuss everything you need to know about WireMock WebSocket.

What is WireMock WebSocket?

WireMock WebSocket is an extension of the WireMock tool that enables developers to simulate WebSocket connections and interactions. With this tool, developers can create mock WebSocket servers that can respond to WebSocket requests and send data to clients. This can be very useful for testing WebSocket-enabled applications and APIs.

How to Use WireMock WebSocket?

To use WireMock WebSocket, you need to first download and install the WireMock tool. Once you have installed WireMock, you can create a new mock WebSocket server by using the following command:

java -jar wiremock-standalone-{version}.jar –port {port} –verbose –extensions com.github.tomakehurst.wiremock.extension.websocket.WebSocketExtension

This command will start a new mock WebSocket server on the specified port. You can then configure the server to respond to WebSocket requests by using the WireMock API.

Configuring WireMock WebSocket

Configuring WireMock WebSocket involves creating mappings between WebSocket requests and responses. You can create these mappings by using the WireMock API.

Creating a Simple Mapping

To create a simple mapping, you can use the following code:

stubFor(webSocket(“/myendpoint”).willReturn(aResponse().withWebSocketUpgrade().withHeader(“Content-Type”, “text/plain”).withBody(“Hello World!”)));

This code creates a mapping for the WebSocket endpoint “/myendpoint”. When a client connects to this endpoint, the server will respond with a WebSocket upgrade response and send the text “Hello World!” to the client.

Creating a Mapping with Dynamic Response

You can also create a more complex mapping that generates a dynamic response based on the request. To do this, you can use the following code:

stubFor(webSocket(“/myendpoint”).willReturn(aResponse().withWebSocketUpgrade().withTransformerParameter(“myParam”, “myValue”).withTransformers(“myTransformer”)));

This code creates a mapping for the WebSocket endpoint “/myendpoint”. When a client connects to this endpoint, the server will respond with a WebSocket upgrade response and apply a transformer to the response. The transformer will use the value of the “myParam” parameter in the request to generate a dynamic response.

Advantages of Using WireMock WebSocket

There are several advantages of using WireMock WebSocket:

Easy to use: WireMock WebSocket is very easy to use and configure, even for developers who are not familiar with WebSocket technology.
Powerful: WireMock WebSocket is a very powerful tool that can simulate complex WebSocket interactions and responses.
Open-source: WireMock WebSocket is open-source, which means it is free to use and can be customized to meet your specific needs.
Flexible: WireMock WebSocket is very flexible and can be used with a wide range of technologies and platforms.

Conclusion

WireMock WebSocket is a powerful tool for simulating WebSocket interactions and responses. It is easy to use, flexible, and open-source, making it a popular choice among developers. If you are looking for a tool to test your WebSocket-enabled applications and APIs, WireMock WebSocket is definitely worth considering.