HttpClient 底层会默认超时自动重发3次，DefaultHttpRequestRetryHandler源码
/**
* Create the request retry handler using the following list of
* non-retriable IOException classes: <br>
* <ul>
* <li>InterruptedIOException</li>
* <li>UnknownHostException</li>
* <li>ConnectException</li>
* <li>SSLException</li>
* </ul>
* @param retryCount how many times to retry; 0 means no retries
* @param requestSentRetryEnabled true if it's OK to retry requests that have been sent
*/
@SuppressWarnings("unchecked")
public DefaultHttpRequestRetryHandler(final int retryCount, final boolean requestSentRetryEnabled) {
this(retryCount, requestSentRetryEnabled, Arrays.asList(
InterruptedIOException.class,
UnknownHostException.class,
ConnectException.class,
SSLException.class));
}
/**
* Create the request retry handler with a retry count of 3, requestSentRetryEnabled false
* and using the following list of non-retriable IOException classes: <br>
* <ul>
* <li>InterruptedIOException</li>
* <li>UnknownHostException</li>
* <li>ConnectException</li>
* <li>SSLException</li>
* </ul>
*/
public DefaultHttpRequestRetryHandler() {
this(3, false);
}
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