HTTP请求时connectionRequestTimeout 、connectionTimeout、socketTimeout三个超时时间的含义

/**
* Returns the timeout in milliseconds used when requesting a connection
* from the connection manager. A timeout value of zero is interpreted
* as an infinite timeout.
* A timeout value of zero is interpreted as an infinite timeout.
* A negative value is interpreted as undefined (system default).
* Default: {@code -1}
*/
public int getConnectionRequestTimeout() {
return connectionRequestTimeout;
}

/**
* Determines the timeout in milliseconds until a connection is established.
* A timeout value of zero is interpreted as an infinite timeout.
* A timeout value of zero is interpreted as an infinite timeout.
* A negative value is interpreted as undefined (system default).
* Default: {@code -1}
*/
public int getConnectTimeout() {
return connectTimeout;
}

/**
* Defines the socket timeout ({@code 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.
* A negative value is interpreted as undefined (system default).
* Default: {@code -1}
*/
public int getSocketTimeout() {
return socketTimeout;
}