ContentNegotiation

A plugin that serves two primary purposes:

• Negotiating media types between the client and server. For this, it uses the Accept and Content-Type headers.

• Serializing/deserializing the content in a specific format when sending requests and receiving responses. Ktor supports the following formats out-of-the-box: JSON, XML, and CBOR.

You can learn more from Content negotiation and serialization.