cookie

fun HttpRequestBuilder.cookie(
    name: String,
    value: String,
    maxAge: Int = 0,
    expires: GMTDate? = null,
    domain: String? = null,
    path: String? = null,
    secure: Boolean = false,
    httpOnly: Boolean = false,
    extensions: Map<String, String?> = emptyMap()
): Unit

Sets a single header of key with a specific value if the value is not null.