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# Phoenix.NotAcceptableError exception (Phoenix v1.8.7)

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Raised when one of the `accept*` headers is not accepted by the server.

This exception is commonly raised by `Phoenix.Controller.accepts/2` which negotiates the media types the server is able to serve with the contents the client is able to render.

If you are seeing this error, you should check if you are listing the desired formats in your `:accepts` plug or if you are setting the proper accept header in the client. The exception contains the acceptable mime types in the `accepts` field.