title: Exception reusing HttpClient https connection
body: <p>I am using apache HttpClient.  While debugging something, I found I am getting error when I execute the same HTTPS HEAD request for the second time using the same connection (connection kept alive). The host is <a href="https://dongshengcn.iriscouch.com" rel="nofollow">https://dongshengcn.iriscouch.com</a>. I am not sure where is wrong, is the server? is it a HttpClient bug? I tend to think this is a HttpClient bug somewhere. Anyways, I am wondering if someone can point me to the right direction. Here is the code and logging info:</p>
  
  <pre><code>import org.apache.http.HttpHost;
  import org.apache.http.client.methods.HttpHead;
  import org.apache.http.client.params.ClientPNames;
  import org.apache.http.impl.client.DefaultHttpClient;
  import org.apache.http.params.BasicHttpParams;
  import org.apache.http.params.HttpConnectionParams;
  import org.apache.http.params.HttpParams;
  import org.apache.http.params.HttpProtocolParams;
  import org.junit.Test;
  
  import java.io.IOException;
  
  /**
   * Created with IntelliJ IDEA.
   * User: dongsheng
   * Date: 1/10/13
   * Time: 4:10 PM
   * To change this template use File | Settings | File Templates.
   */
  public class HttpClientTest {
  
      private int connectionTimeout = 1000;
      private int socketTimeout = 10000;
      private String host = "dongshengcn.iriscouch.com";
  //    private String host = "dongshengcn.cloudant.com";
      private int port = 443;
      boolean useExpectContinue = true;
  
      public DefaultHttpClient configureClient() {
          HttpParams params = new BasicHttpParams();
          HttpProtocolParams.setUseExpectContinue(params, useExpectContinue);
          HttpConnectionParams
                  .setConnectionTimeout(params, connectionTimeout);
          HttpConnectionParams.setSoTimeout(params, socketTimeout);
          HttpConnectionParams.setTcpNoDelay(params, Boolean.TRUE);
  
          String protocol = "https";
          params.setParameter(ClientPNames.DEFAULT_HOST, new HttpHost(host,
                  port, protocol));
          DefaultHttpClient client = new DefaultHttpClient(params);
  
          return client;
      }
  
      @Test
      public void test_dafault_http_client() throws IOException {
          String uri = "/ektorp-test/";
          DefaultHttpClient client = configureClient();
  
          org.apache.http.HttpResponse rsp = client.execute(new HttpHead(uri));
          System.out.println(rsp.toString());
  
          try {
              org.apache.http.HttpResponse rsp2 = client.execute(new HttpHead(uri));
              System.out.println(rsp.toString());
          } catch (Exception e) {
              e.printStackTrace();
          }
      }
  }
  
  
  
  Running HttpClientTest
  2013/01/11 10:12:05:288 EST [DEBUG] BasicClientConnectionManager - Get connection for route {s}-&gt;https://dongshengcn.iriscouch.com:443
  2013/01/11 10:12:06:065 EST [DEBUG] DefaultClientConnectionOperator - Connecting to dongshengcn.iriscouch.com:443
  2013/01/11 10:12:07:201 EST [DEBUG] RequestAddCookies - CookieSpec selected: best-match
  2013/01/11 10:12:07:223 EST [DEBUG] RequestAuthCache - Auth cache not set in the context
  2013/01/11 10:12:07:223 EST [DEBUG] RequestTargetAuthentication - Target auth state: UNCHALLENGED
  2013/01/11 10:12:07:224 EST [DEBUG] RequestProxyAuthentication - Proxy auth state: UNCHALLENGED
  2013/01/11 10:12:07:224 EST [DEBUG] DefaultHttpClient - Attempt 1 to execute request
  2013/01/11 10:12:07:224 EST [DEBUG] DefaultClientConnection - Sending request: HEAD /ektorp-test/ HTTP/1.1
  2013/01/11 10:12:07:226 EST [DEBUG] headers - &gt;&gt; HEAD /ektorp-test/ HTTP/1.1
  2013/01/11 10:12:07:226 EST [DEBUG] headers - &gt;&gt; Host: dongshengcn.iriscouch.com:443
  2013/01/11 10:12:07:226 EST [DEBUG] headers - &gt;&gt; Connection: Keep-Alive
  2013/01/11 10:12:07:303 EST [DEBUG] DefaultClientConnection - Receiving response: HTTP/1.1 404 Host not found
  2013/01/11 10:12:07:304 EST [DEBUG] headers - &lt;&lt; HTTP/1.1 404 Host not found
  2013/01/11 10:12:07:304 EST [DEBUG] headers - &lt;&lt; Content-Length: 14
  2013/01/11 10:12:07:307 EST [DEBUG] DefaultHttpClient - Connection can be kept alive indefinitely
  2013/01/11 10:12:07:309 EST [DEBUG] BasicClientConnectionManager - Releasing connection org.apache.http.impl.conn.ManagedClientConnectionImpl@21cc5069
  2013/01/11 10:12:07:309 EST [DEBUG] BasicClientConnectionManager - Connection can be kept alive indefinitely
  HTTP/1.1 404 Host not found [Content-Length: 14]
  2013/01/11 10:12:07:309 EST [DEBUG] BasicClientConnectionManager - Get connection for route {s}-&gt;https://dongshengcn.iriscouch.com:443
  2013/01/11 10:12:07:310 EST [DEBUG] DefaultHttpClient - Stale connection check
  2013/01/11 10:12:07:311 EST [DEBUG] RequestAddCookies - CookieSpec selected: best-match
  2013/01/11 10:12:07:311 EST [DEBUG] RequestAuthCache - Auth cache not set in the context
  2013/01/11 10:12:07:311 EST [DEBUG] RequestTargetAuthentication - Target auth state: UNCHALLENGED
  2013/01/11 10:12:07:311 EST [DEBUG] RequestProxyAuthentication - Proxy auth state: UNCHALLENGED
  2013/01/11 10:12:07:311 EST [DEBUG] DefaultHttpClient - Attempt 1 to execute request
  2013/01/11 10:12:07:311 EST [DEBUG] DefaultClientConnection - Sending request: HEAD /ektorp-test/ HTTP/1.1
  2013/01/11 10:12:07:311 EST [DEBUG] headers - &gt;&gt; HEAD /ektorp-test/ HTTP/1.1
  2013/01/11 10:12:07:311 EST [DEBUG] headers - &gt;&gt; Host: dongshengcn.iriscouch.com:443
  2013/01/11 10:12:07:311 EST [DEBUG] headers - &gt;&gt; Connection: Keep-Alive
  2013/01/11 10:12:07:314 EST [DEBUG] DefaultHttpResponseParser - Garbage in response: Host not found
  2013/01/11 10:12:07:314 EST [DEBUG] DefaultClientConnection - Connection 0.0.0.0:62168&lt;-&gt;173.192.57.98:443 closed
  2013/01/11 10:12:07:315 EST [DEBUG] DefaultClientConnection - Connection 0.0.0.0:62168&lt;-&gt;173.192.57.98:443 shut down
  2013/01/11 10:12:07:315 EST [DEBUG] BasicClientConnectionManager - Releasing connection org.apache.http.impl.conn.ManagedClientConnectionImpl@67c7980c
  2013/01/11 10:12:07:315 EST [DEBUG] BasicClientConnectionManager - Connection can be kept alive for 9223372036854775807 MILLISECONDS
  org.apache.http.client.ClientProtocolException
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:909)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
      at HttpClientTest.test_dafault_http_client(HttpClientTest.java:69)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
      at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
      at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)
      at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:123)
      at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:104)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:164)
      at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:110)
      at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:175)
      at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcessWhenForked(SurefireStarter.java:107)
      at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:68)
  Caused by: org.apache.http.ProtocolException: The server failed to respond with a valid HTTP response
      at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:103)
      at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:62)
      at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:254)
      at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:289)
      at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:252)
      at org.apache.http.impl.conn.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:191)
      at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:300)
      at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:127)
      at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:712)
      at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:517)
      at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
      ... 32 more
  Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.411 sec
  </code></pre>
  
  <p>If I change the host to a difference one like dongshengcn.cloudant.com:443, and it works as expected. </p>