Set detected Content-Type only when not already set #96
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This PR introduce a condition to set the
Content-Typeheader, backed by a new test.The goal is to have the identical behavior as the http/server and http/fs does.
Content-Typeheader will only be set with the detected MIME type if it is not already set, which means no header previously set (at all).So the condition to set the header is when there is no existing key for the
Content-Typeheader in the response writer map.The purpose of handling the nil value could be seen as the capacity to disable content type detection, and at the same time, not having the
Content-Typeheader in the resulting response for the client.