HTTPCLIENT-2357, regression: Classic HttpClient fails to release connect in case of a proxy authentication failure

Author: ok2c

httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/ConnectExec.java

@@ -293,7 +293,7 @@ private ClassicHttpResponse createTunnelToTarget(
                 response.setEntity(new ByteArrayEntity(
                         EntityUtils.toByteArray(entity, 4096),
                         ContentType.parseLenient(entity.getContentType())));
-                execRuntime.disconnectEndpoint();
+                execRuntime.discardEndpoint();
             }
             return response;
         }

httpclient5/src/test/java/org/apache/hc/client5/http/impl/classic/TestConnectExec.java

@@ -218,7 +218,7 @@ void testEstablishRouteViaProxyTunnelFailure() throws Exception {
 
         final ExecChain.Scope scope = new ExecChain.Scope("test", route, request, execRuntime, context);
         exec.execute(request, scope, execChain);
-        Mockito.verify(execRuntime, Mockito.atLeastOnce()).disconnectEndpoint();
+        Mockito.verify(execRuntime, Mockito.atLeastOnce()).discardEndpoint();
     }
 
     @Test