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What HTTP status response code should I use if the request is missing a required parameter?

The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415(Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was unable to process the contained instructions. For example, this error condition may occur if an XML request body contains well-formed (i.e., syntactically correct), but semantically erroneous, XML instructions.

https://stackoverflow.com/questions/3050518/what-http-status-response-code-should-i-use-if-the-request-is-missing-a-required

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