io.vertx.core.http

Interface HttpClient

All Superinterfaces:

Measured

public interface HttpClient
extends Measured

An asynchronous HTTP client.

It allows you to make requests to HTTP servers, and a single client can make requests to any server.

It also allows you to open WebSockets to servers.

The client can also pool HTTP connections.

For pooling to occur, keep-alive must be true on the HttpClientOptions (default is true). In this case connections will be pooled and re-used if there are pending HTTP requests waiting to get a connection, otherwise they will be closed.

This gives the benefits of keep alive when the client is loaded but means we don't keep connections hanging around unnecessarily when there would be no benefits anyway.

The client also supports pipe-lining of requests. Pipe-lining means another request is sent on the same connection before the response from the preceding one has returned. Pipe-lining is not appropriate for all requests.

To enable pipe-lining, it must be enabled on the HttpClientOptions (default is false).

When pipe-lining is enabled the connection will be automatically closed when all in-flight responses have returned and there are no outstanding pending requests to write.

The client is designed to be reused between requests.

Author:

Tim Fox

Method Summary

Modifier and Type	Method and Description
Future<Void>	close() Like close(Handler) but returns a Future of the asynchronous result
void	close(Handler<AsyncResult<Void>> handler) Close the client.
HttpClient	connectionHandler(Handler<HttpConnection> handler) Set a connection handler for the client.
java.util.function.Function<HttpClientResponse,Future<RequestOptions>>	redirectHandler()
HttpClient	redirectHandler(java.util.function.Function<HttpClientResponse,Future<RequestOptions>> handler) Set a redirect handler for the http client.
Future<HttpClientRequest>	request(HttpMethod method, int port, String host, String requestURI) Like request(HttpMethod, int, String, String, Handler) but returns a Future of the asynchronous result
void	request(HttpMethod method, int port, String host, String requestURI, Handler<AsyncResult<HttpClientRequest>> handler) Create an HTTP request to send to the server at the host and port.
Future<HttpClientRequest>	request(HttpMethod method, String requestURI) Like request(HttpMethod, String, Handler) but returns a Future of the asynchronous result
void	request(HttpMethod method, String requestURI, Handler<AsyncResult<HttpClientRequest>> handler) Create an HTTP request to send to the server at the default host and port.
Future<HttpClientRequest>	request(HttpMethod method, String host, String requestURI) Like request(HttpMethod, String, String, Handler) but returns a Future of the asynchronous result
void	request(HttpMethod method, String host, String requestURI, Handler<AsyncResult<HttpClientRequest>> handler) Create an HTTP request to send to the server at the host and default port.
Future<HttpClientRequest>	request(RequestOptions options) Like request(RequestOptions, Handler) but returns a Future of the asynchronous result
void	request(RequestOptions options, Handler<AsyncResult<HttpClientRequest>> handler) Create an HTTP request to send to the server.
Future<WebSocket>	webSocket(int port, String host, String requestURI) Like webSocket(int, String, String, Handler) but returns a Future of the asynchronous result
void	webSocket(int port, String host, String requestURI, Handler<AsyncResult<WebSocket>> handler) Connect a WebSocket to the specified port, host and relative request URI
Future<WebSocket>	webSocket(String requestURI) Like webSocket(String, Handler) but returns a Future of the asynchronous result
void	webSocket(String requestURI, Handler<AsyncResult<WebSocket>> handler) Connect a WebSocket at the relative request URI using the default host and port
Future<WebSocket>	webSocket(String host, String requestURI) Like webSocket(String, String, Handler) but returns a Future of the asynchronous result
void	webSocket(String host, String requestURI, Handler<AsyncResult<WebSocket>> handler) Connect a WebSocket to the host and relative request URI and default port
Future<WebSocket>	webSocket(WebSocketConnectOptions options) Like webSocket(WebSocketConnectOptions, Handler) but returns a Future of the asynchronous result
void	webSocket(WebSocketConnectOptions options, Handler<AsyncResult<WebSocket>> handler) Connect a WebSocket with the specified options.
Future<WebSocket>	webSocketAbs(String url, MultiMap headers, WebsocketVersion version, List<String> subProtocols) Like webSocketAbs(String, MultiMap, WebsocketVersion, List, Handler) but returns a Future of the asynchronous result
void	webSocketAbs(String url, MultiMap headers, WebsocketVersion version, List<String> subProtocols, Handler<AsyncResult<WebSocket>> handler) Connect a WebSocket with the specified absolute url, with the specified headers, using the specified version of WebSockets, and the specified WebSocket sub protocols.

Methods inherited from interface io.vertx.core.metrics.Measured

isMetricsEnabled

Method Detail

request

void request(RequestOptions options,
             Handler<AsyncResult<HttpClientRequest>> handler)

Create an HTTP request to send to the server. The handler is called when the request is ready to be sent.

Parameters:

options - the request options

handler - the handler called when the request is ready to be sent

request

Future<HttpClientRequest> request(RequestOptions options)

Like request(RequestOptions, Handler) but returns a Future of the asynchronous result

request

void request(HttpMethod method,
             int port,
             String host,
             String requestURI,
             Handler<AsyncResult<HttpClientRequest>> handler)

Create an HTTP request to send to the server at the host and port. The handler is called when the request is ready to be sent.

Parameters:

method - the HTTP method

port - the port

host - the host

requestURI - the relative URI

handler - the handler called when the request is ready to be sent

request

Future<HttpClientRequest> request(HttpMethod method,
                                  int port,
                                  String host,
                                  String requestURI)

Like request(HttpMethod, int, String, String, Handler) but returns a Future of the asynchronous result

request

void request(HttpMethod method,
             String host,
             String requestURI,
             Handler<AsyncResult<HttpClientRequest>> handler)

Create an HTTP request to send to the server at the host and default port. The handler is called when the request is ready to be sent.

Parameters:

method - the HTTP method

host - the host

requestURI - the relative URI

handler - the handler called when the request is ready to be sent

request

Future<HttpClientRequest> request(HttpMethod method,
                                  String host,
                                  String requestURI)

Like request(HttpMethod, String, String, Handler) but returns a Future of the asynchronous result

request

void request(HttpMethod method,
             String requestURI,
             Handler<AsyncResult<HttpClientRequest>> handler)

Create an HTTP request to send to the server at the default host and port. The handler is called when the request is ready to be sent.

Parameters:

method - the HTTP method

requestURI - the relative URI

handler - the handler called when the request is ready to be sent

request

Future<HttpClientRequest> request(HttpMethod method,
                                  String requestURI)

Like request(HttpMethod, String, Handler) but returns a Future of the asynchronous result

webSocket

void webSocket(int port,
               String host,
               String requestURI,
               Handler<AsyncResult<WebSocket>> handler)

Connect a WebSocket to the specified port, host and relative request URI

Parameters:

port - the port

host - the host

requestURI - the relative URI

handler - handler that will be called with the WebSocket when connected

webSocket

Future<WebSocket> webSocket(int port,
                            String host,
                            String requestURI)

Like webSocket(int, String, String, Handler) but returns a Future of the asynchronous result

webSocket

void webSocket(String host,
               String requestURI,
               Handler<AsyncResult<WebSocket>> handler)

Connect a WebSocket to the host and relative request URI and default port

Parameters:

host - the host

requestURI - the relative URI

handler - handler that will be called with the WebSocket when connected

webSocket

Future<WebSocket> webSocket(String host,
                            String requestURI)

Like webSocket(String, String, Handler) but returns a Future of the asynchronous result

webSocket

void webSocket(String requestURI,
               Handler<AsyncResult<WebSocket>> handler)

Connect a WebSocket at the relative request URI using the default host and port

Parameters:

requestURI - the relative URI

handler - handler that will be called with the WebSocket when connected

webSocket

Future<WebSocket> webSocket(String requestURI)

Like webSocket(String, Handler) but returns a Future of the asynchronous result

webSocket

void webSocket(WebSocketConnectOptions options,
               Handler<AsyncResult<WebSocket>> handler)

Connect a WebSocket with the specified options.

Parameters:

options - the request options

webSocket

Future<WebSocket> webSocket(WebSocketConnectOptions options)

Like webSocket(WebSocketConnectOptions, Handler) but returns a Future of the asynchronous result

webSocketAbs

void webSocketAbs(String url,
                  MultiMap headers,
                  WebsocketVersion version,
                  List<String> subProtocols,
                  Handler<AsyncResult<WebSocket>> handler)

Connect a WebSocket with the specified absolute url, with the specified headers, using the specified version of WebSockets, and the specified WebSocket sub protocols.

Parameters:

url - the absolute url

headers - the headers

version - the WebSocket version

subProtocols - the subprotocols to use

handler - handler that will be called if WebSocket connection fails

webSocketAbs

Future<WebSocket> webSocketAbs(String url,
                               MultiMap headers,
                               WebsocketVersion version,
                               List<String> subProtocols)

Like webSocketAbs(String, MultiMap, WebsocketVersion, List, Handler) but returns a Future of the asynchronous result

connectionHandler

HttpClient connectionHandler(Handler<HttpConnection> handler)

Set a connection handler for the client. This handler is called when a new connection is established.

Returns:

a reference to this, so the API can be used fluently

redirectHandler

HttpClient redirectHandler(java.util.function.Function<HttpClientResponse,Future<RequestOptions>> handler)

Set a redirect handler for the http client.

The redirect handler is called when a 3xx response is received and the request is configured to follow redirects with HttpClientRequest.setFollowRedirects(boolean).

The redirect handler is passed the HttpClientResponse, it can return an HttpClientRequest or null.

• when null is returned, the original response is processed by the original request response handler
• when a new Future<HttpClientRequest> is returned, the client will send this new request

The new request will get a copy of the previous request headers unless headers are set. In this case, the client assumes that the redirect handler exclusively managers the headers of the new request.

The handler must return a Future<HttpClientRequest> unsent so the client can further configure it and send it.

Parameters:

handler - the new redirect handler

Returns:

a reference to this, so the API can be used fluently

redirectHandler

java.util.function.Function<HttpClientResponse,Future<RequestOptions>> redirectHandler()

Returns:

the current redirect handler.

close

void close(Handler<AsyncResult<Void>> handler)

Close the client. Closing will close down any pooled connections. Clients should always be closed after use.

close

Future<Void> close()

Like close(Handler) but returns a Future of the asynchronous result