Your API supports both JSON and XML response formats via content negotiation. A client sends an Accept header you don't support. What do you return, and how do you communicate available formats?

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Your API supports both JSON and XML response formats via content negotiation. A client sends an Accept header you don't support. What do you return, and how do you communicate available formats?

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