Created attachment 36881 [details] Screen shot of HTTP Header Manager When Transfer-Encoding header is added in HTTP Header Manager, running a Jemter test plan caused the following error. org.apache.http.client.ClientProtocolException at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:187) at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:850) at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:561) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:67) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1282) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1271) at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:627) at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:551) at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:490) at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:257) at java.lang.Thread.run(Unknown Source) Caused by: org.apache.http.ProtocolException: Transfer-encoding header already present at org.apache.http.protocol.RequestContent.process(RequestContent.java:94) at org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:133) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) 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) ... 11 more
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/5197