Using Fiddlerįor the purposes of this short post I’ll be using Postman to fire off API requests to a backend service in the same way a web app would request the data we wish to manipulate. You can also filter out hosts shown in the sessions list by using the “Filters” tab, selecting “show only the following Hosts”, and then entering the host for the requests you want to display. You can tell Fiddler to decrypt traffic from only certain hosts in the “Skip/Perform for the following hosts” field of the HTTPS menu used above. Once this is done, you’ll be able to see all traffic that runs through the proxy appearing in the session window.īy default, Fiddler will route and list all HTTP requests in the session window so it’s recommended that you close all unnecessary applications. You can then import this to your browser list of trusted certificates. You can export the certificate from Fiddler by going back to the previous HTTPS tab and clicking Actions -> Export Root Certificate to desktop. As such, you will have to set your browser to trust the certificate when you get a warning, or manually add the certificate to the browser’s list of trusted. It provides a certificate and uses this to pretend to be the web server to the browser, and the browser to the web server. I also set the dropdown to “…from browsers only”.įiddler decrypts the traffic by acting as a man-in-the-middle. This can be done by clicking on Tools -> Telerik Fiddler Options -> HTTPS tab and checking the “Decrypt HTTPS traffic” box. If you’re following along with the blog post, or the host you’re looking to test against uses HTTPS, then you’ll need to allow Fiddler to decrypt the HTTPS traffic running through the proxy. However, if this data is retrieved from a specific endpoint then you’re in a good place to start using Fiddler to intercept those API calls and return the data you need. Often testing logic like this can be a slow process of manually changing data somewhere on the backend to then trigger different scenarios on the front end. Times like this may arise when you need to test logic on the client side that is highly dependent on data received from the backend. However, sometimes just observing isn’t enough and you need to dig down into the data being used.
I use it often when web testing to observe when data is transmitted/requested and to see what’s being communicated, making it possible to build a picture of the communication between the client and backend services. Fiddler is a great tool for debugging web requests.
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