Grokking Modern API Design Interview
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HTTP Methods and Their Semantics

A mobile application sends this request:

POST /orders

The server creates the order. The response is lost on the way back. After a timeout, the application sends the same request again.

How many orders now exist?

Two. Nothing in POST /orders prevents it, and nothing in HTTP treats the second delivery as a repeat of the first. Making the answer "one" takes a deliberate decision, and this lesson is where that decision gets made.

The method on a request is more than a label

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