415 Unsupported Media Type: What It Means and How to Fix It
Blog post from Postman
A 415 Unsupported Media Type error occurs when there is a mismatch between the data format sent in a request and the format expected by the server, often due to an incorrect or missing Content-Type header. This error is common in early-stage API integrations and can result from outdated examples, inconsistent media types across environments, or drift between an API's design and its consumption. While fixing a 415 error is generally straightforward, such as by correcting the header or payload, the error often highlights deeper workflow issues like incomplete documentation or lack of alignment between API design and implementation. Preventing 415 errors in the long term requires proactive measures, including using executable examples, maintaining connected design and test processes, providing clear examples, and ensuring machine-readability for automated consumers. If issues persist after correcting the Content-Type, further investigation into server requirements, additional headers, or body schema may be necessary, especially if multiple team members encounter the error.
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