/** Expected **/
fun Route.accept(contentType: ContentType, build: Route.() -> Unit): Route {
    return header("Accept", "${contentType.contentType}/${contentType.contentSubtype}", build)
}
fun Route.contentType(contentType: ContentType, build: Route.() -> Unit): Route {
    return header("Content-Type", "${contentType.contentType}/${contentType.contentSubtype}", build)
}

/** Actual **/
fun Route.contentType(contentType: ContentType, build: Route.() -> Unit): Route {
    return header("Accept", "${contentType.contentType}/${contentType.contentSubtype}", build)
}