Blog
Practical guides for seeing what your apps send, and for making them misbehave on purpose.
Make a payment, login or search endpoint fail on demand, so you can see how your app handles errors. Two rules, no code changes, and one detail that keeps you from double-charging a card.
Redirect requests from a deployed web app, desktop app or Postman to the API running on your laptop, using a single Modify Request rule and a template variable.
Build the frontend first. Use a Modify Response rule to return realistic JSON for an endpoint that doesn't exist yet, including values pulled from the request URL.
A step-by-step guide to seeing the requests and responses your apps send, even over HTTPS, and how to read what you find.
Make an endpoint hang, answer late, or fail after a delay, to check how your app behaves when the network is the problem rather than the server.
Use a Pause and Review rule to freeze matching requests before they leave your machine, change the method, URL, headers or body, and resume or drop them. A manual breakpoint for the network.
Work through the usual reasons a request doesn't appear in an intercepting proxy, from the system proxy and certificates to Node, Python, pinned certificates and localhost.
