We wanted to release this initial feature set quickly to let you use it. This allows you to capture only the frames that you are interested in. Use the pause/resume button in the Network panel toolbar to stop intercepting WS traffic. Of course, you can still see the raw data (as sent over the wire) as well. Payload based on those protocols is parsed and displayed as an expandable tree for easy inspection. The inspector currently supports the following WS protocols – and we have more planned: Selecting a frame in the list shows a preview at the bottom of the Messages panel. The Data and Time columns are visible by default, but you can customize the interface to see more columns by right-clicking on the header. To focus on specific messages, frames can be filtered free text. Each frame expands on click, so you can inspect the formatted data. The live-updated table shows data for sent (green arrow) and received (red arrow) WS frames. In addition, the UI now offers a fresh new Messages panel that can be used to inspect WS frames sent and received through the selected WS connection. The response code indicates that the server is switching to WS connection.Ĭlicking on the 101 request opens the familiar sidebar, showing details about the selected HTTP request. Only the 101 request ( WebSocket Protocol Handshake) is visible. The following screenshot shows the WS filter in action. It’s already possible to filter the content for opened WS connections in this panel, but till now there was no chance to see the actual data transferred through WS frames. The WebSocket Inspector is part of the existing Network panel UI in DevTools. Getting started with the WebSocket Inspector In the meantime, let’s dive into the new feature. Want to learn more about how to set up WebSocket for your client applications? Head over to MDN’s guides. The WS inspector in Firefox DevTools currently supports Socket.IO and SockJS, but more support is in the works. These libraries can help with connection failures, proxies, authentication and authorization, scalability, and much more. Because the API sends and receives data at any time, it is used mainly in applications requiring real-time communication.Īlthough it is possible to work directly with the WS API, some existing libraries come in handy and help save time. We use the WebSocket (WS) API to create a persistent connection between a client and server. Then, keep reading to learn more about WebSockets and the tricks that the new panel has up its sleeve.īut first, big thanks to Heng Yeow Tan, the Google Summer of Code (GSoC) student who’s responsible for the implementation. To use the inspector now, download Firefox Developer Edition, open DevTools’ Network panel to find the Messages tab. The WebSocket inspector will be released in Firefox 71, but is ready for you to use in Firefox Developer Edition now. We are especially excited about our new WebSocket inspection feature, because you told us in feedback how important it would be for your daily work. The easiest way is to keep as a devDependency in your package.The Firefox DevTools team and our contributors were hard at work over the summer, getting Firefox 70 jam-packed with improvements. Note: this service currently only supports Chrome v63 and up, Chromium, and Firefox 86 and up! Given that cloud vendors don't expose access to the Chrome DevTools Protocol this service also usually only works when running tests locally or through a Selenium Grid v4 or higher. Since Firefox 86, a subset of Chrome DevTools Protocol has been implemented by passing the capability "moz:debuggerAddress": true. intercept requests, throttle network capabilities or take CSS/JS coverage. With this service you can enhance the wdio browser object to leverage that access and call Chrome DevTools commands within your tests to e.g. This provides interesting opportunities to automate Chrome beyond the WebDriver protocol. With Chrome v63 and up the browser started to support multi clients allowing arbitrary clients to access the Chrome DevTools Protocol. A WebdriverIO service that allows you to run Chrome DevTools commands in your tests
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