apache 的HttpClient 的默认重试机制
maven
异常重试log
RetryExec
org/apache/http/impl/execchain/RetryExec.java
DefaultHttpRequestRetryHandler
org/apache/http/impl/client/DefaultHttpRequestRetryHandler.java
<dependency>
<groupId>org.apache.httpcomponents </groupId>
<artifactId>httpclient </artifactId>
<version>4.5.2</version>
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</dependency>
2017-01-31 19:31:39.057  INFO  3873 --- [askScheduler-13] o.apache.hain.RetryExec    : I/O  exception  (org.apache.http.NoHttpRespon seException) caught  when  processing  request  to  {}->192.168.99.100:8080: The  target  server  failed  to  respond
2017-01-31 19:31:39.058  INFO  3873 --- [askScheduler-13] o.apache.hain.RetryExec    : Retrying  request  to  {}->192.168.99.100:8
080
/**
* Request executor in the request execution chain that is responsible
* for making a decision whether a request failed due to an I/O error
* should be re-executed.
* <p>
* Further responsibilities such as communication with the opposite
* endpoint is delegated to the next executor in the request execution
* chain.
* </p>
*
* @since  4.3
*/
@Immutable
public  class  RetryExec  implements  ClientExecChain  {
private  final  Log log = Log(getClass());
private  final  ClientExecChain requestExecutor;
private  final  HttpRequestRetryHandler retryHandler;
public  RetryExec(
final  ClientExecChain requestExecutor,
final  HttpRequestRetryHandler retryHandler) {
默认重试3次，三次都失败则抛出NoHttpResponseException或其他异常
doc /**
* The default {@link  HttpRequestRetryHandler} used by request executors.
*
* @since  4.0
*/
@Immutable
public  class  DefaultHttpRequestRetryHandler  implements  HttpRequestRetryHandler  {    public  static  final  DefaultHttpRequestRetryHandler INSTANCE = new  DefaultHttpRequestRetryHandler();    /** the number of times a method will be retried */
private  final  int  retryCount;
/** Whether or not methods that have successfully sent their request will be retried */    private  final  boolean  requestSentRetryEnabled;
private  final  Set<Class<? extends  IOException>> nonRetriableClasses;
/**
* Create the request retry handler using the specified IOException classes
*
* @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

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