doc: 阅读webflux文档

spring/webflux/webclient.md

@@ -94,3 +94,58 @@ public WebClient webClient() {
 	return WebClient.builder().clientConnector(connector).build(); 
 }
 ```
+#### timeout
+如果要设置connection timeout，示例如下：
+```java
+import io.netty.channel.ChannelOption;
+
+HttpClient httpClient = HttpClient.create()
+		.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000);
+
+WebClient webClient = WebClient.builder()
+		.clientConnector(new ReactorClientHttpConnector(httpClient))
+		.build();
+```
+如果要配置read/write timeout，可以按照如下示例进行配置：
+```java
+import io.netty.handler.timeout.ReadTimeoutHandler;
+import io.netty.handler.timeout.WriteTimeoutHandler;
+
+HttpClient httpClient = HttpClient.create()
+		.doOnConnected(conn -> conn
+				.addHandlerLast(new ReadTimeoutHandler(10))
+				.addHandlerLast(new WriteTimeoutHandler(10)));
+
+// Create WebClient...
+```
+为所有请求配置response timeout:
+```java
+HttpClient httpClient = HttpClient.create()
+		.responseTimeout(Duration.ofSeconds(2));
+
+// Create WebClient...
+```
+
+为指定的请求配置response timeout:
+```java
+WebClient.create().get()
+		.uri("https://example.org/path")
+		.httpRequest(httpRequest -> {
+			HttpClientRequest reactorRequest = httpRequest.getNativeRequest();
+			reactorRequest.responseTimeout(Duration.ofSeconds(2));
+		})
+		.retrieve()
+		.bodyToMono(String.class);
+```
+
+### 各个超时含义
+再restTemplate等阻塞api中，各个超时的含义如下所示：
+
+#### readTimeout
+会为serverSocket（和server进行通信的socket）设置`SocketOptions.SO_SOCKET`，单位为ms。
+
+当`SO_SOCKET`被设置为正数值时，对`socket关联的inputstream`阻塞式调用，将最多阻塞该指定时长。如果调用超时，那么将会抛出`java. net. SocketTimeoutException`，但是socket仍然有效。
+
+#### connectTimeout
+以ms为单位指定一个超时时长，当与服务端建立连接时，如果超过该时长后连接仍未建立，那么将会抛出`java.net.SocketTimeoutException`异常。
+