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?

There may be two. POST does not automatically identify the second request as a retry. To create only one order, the operation needs an explicit duplicate-prevention rule.

The HTTP method defines the general meaning of a request. Clients and intermediaries use it when handling caching and retries, along with headers and the API's documented behavior.

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