Which HTTP header indicates the media type the client accepts in a REST API request?

The Accept header specifies the media types (e.g., application/json, text/html) that the client is capable of processing and prefers to receive in the response. This allows the server to send data in a format the client can understand. Accept-Encoding indicates the compression algorithms the client supports. Accept-Patch specifies the patch document formats the client accepts. Content-Type, conversely, indicates the media type of the request body being sent by the client to the server, not what the client accepts in return.