During the load test, the sampler intermittently fails to send headers

[sbarthwal]

During the load test, the sampler intermittently fails to send headers
Getting following error
java.util.concurrent.ExecutionException: org.eclipse.jetty.client.HttpResponseException: HTTP protocol violation: Authentication challenge without WWW-Authenticate header at com.blazemeter.jmeter.http2.core.HTTP2FutureResponseListener.getResult(HTTP2FutureResponseListener.java:121) at com.blazemeter.jmeter.http2.core.HTTP2FutureResponseListener.get(HTTP2FutureResponseListener.java:93) at com.blazemeter.jmeter.http2.core.HTTP2JettyClient.getContent(HTTP2JettyClient.java:413) at com.blazemeter.jmeter.http2.core.HTTP2JettyClient.send(HTTP2JettyClient.java:402) at com.blazemeter.jmeter.http2.core.HTTP2JettyClient.sample(HTTP2JettyClient.java:356) at com.blazemeter.jmeter.http2.sampler.HTTP2Sampler.sample(HTTP2Sampler.java:182) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1311) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1300) at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:651) at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:570) at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:501) at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:268) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.eclipse.jetty.client.HttpResponseException: HTTP protocol violation: Authentication challenge without WWW-Authenticate header at org.eclipse.jetty.client.AuthenticationProtocolHandler$AuthenticationListener.onComplete(AuthenticationProtocolHandler.java:159) at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:213) at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:205) at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:477) at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:457) at org.eclipse.jetty.client.HttpReceiver.responseSuccess(HttpReceiver.java:420) at org.eclipse.jetty.http2.client.http.HttpReceiverOverHTTP2.access$200(HttpReceiverOverHTTP2.java:46) at org.eclipse.jetty.http2.client.http.HttpReceiverOverHTTP2$ContentNotifier.process(HttpReceiverOverHTTP2.java:256) at org.eclipse.jetty.http2.client.http.HttpReceiverOverHTTP2.notifyContent(HttpReceiverOverHTTP2.java:225) at org.eclipse.jetty.http2.client.http.HttpReceiverOverHTTP2.onData(HttpReceiverOverHTTP2.java:193) at org.eclipse.jetty.http2.client.http.HttpChannelOverHTTP2$Listener.onDataDemanded(HttpChannelOverHTTP2.java:199) at org.eclipse.jetty.http2.HTTP2Stream.notifyDataDemanded(HTTP2Stream.java:831) at org.eclipse.jetty.http2.HTTP2Stream.processData(HTTP2Stream.java:540) at org.eclipse.jetty.http2.HTTP2Stream.onData(HTTP2Stream.java:499) at org.eclipse.jetty.http2.HTTP2Stream.process(HTTP2Stream.java:387) at org.eclipse.jetty.http2.HTTP2Session.onData(HTTP2Session.java:262) at org.eclipse.jetty.http2.HTTP2Connection$ParserListener.onData(HTTP2Connection.java:407) at org.eclipse.jetty.http2.parser.BodyParser.notifyData(BodyParser.java:103) at org.eclipse.jetty.http2.parser.DataBodyParser.onData(DataBodyParser.java:145) at org.eclipse.jetty.http2.parser.DataBodyParser.onData(DataBodyParser.java:140) at org.eclipse.jetty.http2.parser.DataBodyParser.parse(DataBodyParser.java:106) at org.eclipse.jetty.http2.parser.Parser.parseBody(Parser.java:193) at org.eclipse.jetty.http2.parser.Parser.parse(Parser.java:122) at org.eclipse.jetty.http2.HTTP2Connection$HTTP2Producer.produce(HTTP2Connection.java:278) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.produceTask(AdaptiveExecutionStrategy.java:450) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:243) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.produce(AdaptiveExecutionStrategy.java:194) at org.eclipse.jetty.http2.HTTP2Connection.produce(HTTP2Connection.java:208) at org.eclipse.jetty.http2.HTTP2Connection.onFillable(HTTP2Connection.java:155) at org.eclipse.jetty.http2.HTTP2Connection$FillableCallback.succeeded(HTTP2Connection.java:378) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100) at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:558) at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:379) at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:146) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100) at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:416) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:385) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:272) at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:140) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149) ... 1 more
As you can see, there are 105 successful requests and 10 failures, indicating that the request itself is functioning. However, the sampler intermittently fails to send headers.

from UI I see empty headers in failed request