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Because this system is so dynamic, it is also where "dark patterns" (user interface tricks that make you do things you don't intend to) often live.

When you hit that endpoint, the server doesn't just send back HTML. It sends back a of the steps. https twitter com i flow signup

When you first land on the page, a JavaScript file runs, generates a cryptographic nonce (number used once), and starts a session. The flow endpoint checks for that token in every request. If you try to jump from Step 1 to Step 4, the Flow engine throws a 400 Bad Request because you have violated the state machine. Because this system is so dynamic, it is

It is a silent, robotic, efficient gateway to the global town square. And now, next time you see that URL flash in your status bar, you will know exactly what is happening: You aren't just filling out a form. You are walking through a state machine. When you first land on the page, a

Understanding /i/flow/signup matters for three reasons: