headers or even its full URL; only the target server's hostname is sent to the
 proxy.

 <p>Prior to sending any CONNECT request OkHttp always calls the proxy authenticator so that it
 may prepare preemptive authentication. OkHttp will call <a href="../../../../com/lark/oapi/okhttp/Authenticator.html#authenticate-com.lark.oapi.okhttp.Route-com.lark.oapi.okhttp.Response-"><code>authenticate(com.lark.oapi.okhttp.Route, com.lark.oapi.okhttp.Response)</code></a> with a fake <code>HTTP/1.1 407 Proxy Authenticati