What are common `Content-Type` headers that can cause a 415 error in Postman?

Common `Content-Type` headers that, if mismatched or absent, can lead to a 415 error in Postman include: `application/json` (for JSON payloads), `application/xml` (for XML payloads), `multipart/form-data` (for file uploads or form data), and `application/x-www-form-urlencoded` (for standard HTML form submissions). The specific `Content-Type` depends entirely on the API you are interacting with.