Future<HttpClientRequest> open(String method, String host, int port, String path)

Opens a HTTP connection.

The HTTP method to use is specified in method, the server is specified using host and port, and the path (including a possible query) is specified using path. The path may also contain a URI fragment, which will be ignored.

The Host header for the request will be set to the value host:port. This can be overridden through the HttpClientRequest interface before the request is sent. NOTE if host is an IP address this will still be set in the Host header.

For additional information on the sequence of events during an HTTP transaction, and the objects returned by the futures, see the overall documentation for the class HttpClient.

Source 

Future<HttpClientRequest> open(String method,
                               String host,
                               int port,
                               String path);