What header specifies the character sets that are acceptable for the request?

The header that specifies the character sets that are acceptable for the request is the Accept-Charset header. This header informs the server about the character encoding formats that the client supports when processing the content of the response. By including this header, clients can ensure that they receive data in a format that can be correctly interpreted and displayed, especially when dealing with internationalized content.

The Accept-Charset header allows the server to choose a suitable character set for the response based on what the client can handle, which is especially important in web applications that need to support multiple languages and character encodings.

In contrast, Cache-Control governs caching mechanisms between the client and server, allowing control over how responses are cached. Content-Type specifies the media type of the resource being sent to the client, such as text/html or application/json, but does not indicate acceptable character sets. Authorization is used for authentication, conveying credentials for accessing protected resources, and is unrelated to character sets.