How to determine the format of the message that came to the server - Json or just a string?

Question

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I want to send json messages to the server and just strings, numbers. How can I determine what format the message from the client carries?

Answer 1

You parse (unmarshal) as JSON, if there is an error, you consider it a simple string.

Answer 2

Look at the HTTP header Content-Type . If there is application/json , then the output is obvious! If we are talking about an HTTP server, of course, but with others it is similar - there are service headers that determine the data format.