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.


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A ContentNegotiation configuration that is used during installation.

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A companion object used to install a plugin.