ktor-server-cors/io.ktor.server.plugins.cors.routing/CORS

CORS

val CORS: RouteScopedPlugin<CORSConfig>(source)

A plugin that allows you to configure handling cross-origin requests. This plugin allows you to configure allowed hosts, HTTP methods, headers set by the client, and so on.

CORS preflight requests (OPTIONS with an Access-Control-Request-Method header) are intercepted by the plugin and answered before routing, including when the request origin matches the server origin.

The configuration below allows requests from the specified address and allows sending the Content-Type header:

install(CORS) {
    host("0.0.0.0:8081")
    header(HttpHeaders.ContentType)
}

You can learn more from CORS.

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