HttpClient的请求超时和响应超时

HttpClient是apache的开源实现，Android SDK中集成了HttpClient，项目开发中目前使用HttpClient来请求网络数据。在开发中碰到下面两个参数。

CONNECTION_TIMEOUT = “http.connection.timeout”

SO_TIMEOUT = “http.socket.timeout”

这两个时间分别叫做请求超时和响应超时，之前对它们的真正含义比较模糊，今天通过文档来了解一下他们的具体含义。

参考文档：http://grepcode.com/file/repo1.maven.org/maven2/org.apache.httpcomponents/httpcore/4.3-beta2/org/apache/http/params/CoreConnectionPNames.java



org.apache.http.params.CoreConnectionPNames.CONNECTION_TIMEOUT

Determines the timeout in milliseconds until a connection is established. A timeout value of zero is interpreted as an infinite timeout. 
Please note this parameter can only be applied to connections that are bound to a particular local address. 
This parameter expects a value of type java.lang.Integer.
public static final String CONNECTION_TIMEOUT = “http.connection.timeout”;

这个参数表示HTTP连接的超时时间，如果设置为0，则表示永远不会超时。

org.apache.http.params.CoreConnectionPNames.SO_TIMEOUT

Defines the socket timeout (SO_TIMEOUT) in milliseconds, which is the timeout for waiting for data or, put differently, a maximum period inactivity between two consecutive data packets). A timeout value of zero is interpreted as an infinite timeout. 
This parameter expects a value of type java.lang.Integer.
public static final String SO_TIMEOUT = “http.socket.timeout”;

这个参数设定的是HTTP连接成功后，读取数据的超时时间。由于网络数据的读取是阻塞的，如果两个连续的数据包的接收间隔超过指定时长，就会超时。 如果设置为0，则表示永远不会超时。