![]() It can also capture and manipulate cookies or set certain HTTP headers that are blocked on the Chrome platform by default. The Postman Chrome app can be used in tandem with the Postman Interceptor extension to make and capture requests. If you have a web app for which you don’t have a collection built already, or you just want to debug the APIs that your app is using, this can save a lot of time. You can filter requests according to the URL based on a regular expression. There are no code changes required either. There is no need to install or configure a proxy. ![]() The web server returns a response directly to the Chrome browser.The Interceptor is listening for any calls made by the Chrome browser and captures the request, forwards the request onward, and also sends the request to Postman.The Chrome browser is the client that sends a request to the web server which is INTERCEPTED by the Postman Interceptor.This means you can debug your web apps APIs in real time! It can capture network requests directly from Chrome and save them to Postman’s history. Postman Interceptor is a Chrome extension that functions as a proxy to capture HTTP or HTTPS requests. This ensures that the regression issues can be avoided as you keep expanding your application.Interceptor extension What is Interceptor These tests can run on demand using the collection runner, or they can be included in your CI/ CD pipeline using Postman’s CLI tool, Newman. The proxy session can now be saved as a collection where you can add test cases along response time, size, etc. Generate an automation test out of the session Now that your team was able to fix the issue after you performed a proper analysis, you want to ensure that such issues do not occur again. This significantly reduces their efforts as they spend minimal time reproducing the error and can quickly fix the issue. The teammates from here on can refer to the session, see the particular requests that are having the issues, and replay the same requests within Postman by just clicking on the request URL in the session. Give a proper name to your session and ask your developers to refer to the same in the History of your Postman workspace. What next? Sharing the session with your teammates Let’s say you find that for a certain group of your test user IDs the response time and response size are unusually high. When analyzing the traffic, you and your teammates can look at various attributes, such as type of requests, response size, response time, and more. You may find it difficult to debug scenarios alone, so your fellow teammates can join you as they see the session in real time in the History while you are running these test scenarios. ![]() Pro tip: We suggest running your scenario completely and capturing the traffic corresponding to it in one session. The session will allow you to bind the traffic in a certain timeframe. You can start capturing traffic by connecting to the proxy and starting a debugging session. The Postman proxy allows you to capture HTTP traffic flowing between your frontend and backend. To do a proper RCA of the issue, you would need to know the data that is flowing between the frontend and the backend of your application. So what’s next? Intercept the traffic using the Postman proxy Doing a proper root cause analysis (RCA) is required so that the issue can be discussed and subsequently fixed. You encounter some issue that is happening during the customer login flow. Let’s consider a scenario where you want to test an e-commerce application that you and your team are building. Postman’s proxy allows you to intercept the traffic between your web app and backend, enabling you to do a clear-box testing of your web app. While the APIs and UI can be standalone-tested, it’s important to test both in conjunction and observe the impact that various user interactions have on API flows. For any web application developer, it’s important to know and test the APIs that power an app.
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