Apache HttpClient - 中止请求

可以使用 abort() 方法中止当前 HTTP 请求，即在对特定请求调用此方法后将中止其执行。

如果在执行一次后调用了此方法，则不会影响该执行的响应，并且将中止后续执行。

示例

如果您观察以下示例，我们创建一个 HttpGet 请求并使用 getMethod() 打印所使用的请求格式。

然后，使用相同的请求执行另一个执行。再次使用第一个执行打印状态行。最后，打印第二个执行的状态行。

如前所述，将会打印第一个执行（中止方法之前的执行）的响应（包括在中止方法后编写的第二个状态行），并且中止方法之后当前请求的所有后续执行都将调用异常失败。

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class HttpGetExample {
   public static void main(String args[]) throws Exception{
   
      //Creating an HttpClient object
      CloseableHttpClient httpclient = HttpClients.createDefault();

      //Creating an HttpGet object
      HttpGet httpget = new HttpGet("https://tutorialspoint.com/");

      //Printing the method used
      System.out.println(httpget.getMethod());
 
      //Executing the Get request
      HttpResponse httpresponse = httpclient.execute(httpget);

      //Printing the status line
      System.out.println(httpresponse.getStatusLine());

      httpget.abort();
      System.out.println(httpresponse.getEntity().getContentLength());
 
      //Executing the Get request
      HttpResponse httpresponse2 = httpclient.execute(httpget);
      System.out.println(httpresponse2.getStatusLine());
   }
}

输出

执行时，上述程序将生成以下输出 -

On executing, the above program generates the following output.
GET
HTTP/1.1 200 OK
-1
Exception in thread "main" org.apache.http.impl.execchain.RequestAbortedException:
Request aborted
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:180)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
at HttpGetExample.main(HttpGetExample.java:32)