Docusign REST calls give from time to time errors on REST POST (SSLException Connection reset)

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From time to time I get errors when REST calls to Docusign are made inside a microflow. At the bottom of this message I put the Mendix error details.   With some google research I found: Resolution  In HTTP 1.1, the "Invoke REST API" will use persistent HTTP connection by default, it will send HTTP Header "Connection: keep-alive" when sending http request, in this case the http connection will be kept in alive, all request/response will use the same http connection. The advantages for using persistent HTTP connection is to reduce latency, CPU usage or network congestion. However sometimes, for example the firewall will monitor all non used connections, it will drop and close non used connection after certain time, such as 2 hours. In this case after several hours or days the "Invoke REST API" will still try to use same connection to send request to server which is already closed. Then customer might encounter the "Connection Reset" exception. Customer can add HTTP Header "Connection: close" in HTTP Request, in this case the connection will not considered persistent, it will be closed after usage, every new request will create new http connection and customer will not encounter "Connection Reset" exception. To Add the Header, customer can go to "Input Editor" of Invoke REST API, add "Connection" under Header, and then go to "Input", specify "close" for "Connection" See attached screenshots for more information. Customer can also check firewall or Server setting to adjust the "keep alive" time setting to avoid the issue.   Does anyone know if updating the HTTP Header to close the connection is a good idea? Or is there a better way to fix this problem? Thanks in advance Rob Error calling REST service at JFlowMain.ACT_PubEditorCreateEmbeddedSigning_AuthorContract (CallRest : 'Call REST (POST)') Advanced stacktrace: at com.mendix.integration.actions.microflow.RestCallAction.execute(RestCallAction.scala:59) Caused by: java.security.PrivilegedActionException: javax.net.ssl.SSLException: Connection reset at com.mendix.integration.util.PrivilegedUtil$$anonfun$withPrivileged$2.applyOrElse(PrivilegedUtil.scala:17) Caused by: null at java.base/java.security.AccessController.doPrivileged(Native Method) at com.mendix.integration.util.PrivilegedUtil$.$anonfun$withPrivileged$1(PrivilegedUtil.scala:13) at scala.util.Try$.apply(Try.scala:213) at com.mendix.integration.util.PrivilegedUtil$.withPrivileged(PrivilegedUtil.scala:13) at com.mendix.http.LoggableHttpClient.execute(LoggableHttpClient.scala:26) at com.mendix.integration.actions.microflow.RestCallAction.executeRequest(RestCallAction.scala:74) at com.mendix.integration.actions.microflow.RestCallAction.execute(RestCallAction.scala:54) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:215) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:165) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:40) at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:76) at com.mendix.webui.actions.client.ExecuteMicroflowAction.$anonfun$apply$3(ExecuteMicroflowAction.scala:42) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:43) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:22) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:213) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:988) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Unknown Source) Caused by: Connection reset at java.base/sun.security.ssl.Alert.createSSLException(Unknown Source) at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source) at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source) at java.base/sun.security.ssl.TransportContext.fatal(Unknown Source) at java.base/sun.security.ssl.SSLSocketImpl.handleException(Unknown Source) at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(Unknown Source) at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137) at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153) at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157) at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) 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 com.mendix.http.LoggableHttpClient.$anonfun$execute$3(LoggableHttpClient.scala:26) at com.mendix.integration.util.PrivilegedUtil$$anon$1.run(PrivilegedUtil.scala:14) at java.base/java.security.AccessController.doPrivileged(Native Method) at com.mendix.integration.util.PrivilegedUtil$.$anonfun$withPrivileged$1(PrivilegedUtil.scala:13) at scala.util.Try$.apply(Try.scala:213) at com.mendix.integration.util.PrivilegedUtil$.withPrivileged(PrivilegedUtil.scala:13) at com.mendix.http.LoggableHttpClient.execute(LoggableHttpClient.scala:26) at com.mendix.integration.actions.microflow.RestCallAction.executeRequest(RestCallAction.scala:74) at com.mendix.integration.actions.microflow.RestCallAction.execute(RestCallAction.scala:54) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:215) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:165) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:40) at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:76) at com.mendix.webui.actions.client.ExecuteMicroflowAction.$anonfun$apply$3(ExecuteMicroflowAction.scala:42) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:43) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:22) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:213) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:988) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Unknown Source) Caused by: Connection reset at java.base/java.net.SocketInputStream.read(Unknown Source) at java.base/java.net.SocketInputStream.read(Unknown Source) at java.base/sun.security.ssl.SSLSocketInputRecord.read(Unknown Source) at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(Unknown Source) at java.base/sun.security.ssl.SSLSocketImpl.readApplicationRecord(Unknown Source) at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(Unknown Source) at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137) at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153) at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138) at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56) at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157) at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272) at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186) 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 com.mendix.http.LoggableHttpClient.$anonfun$execute$3(LoggableHttpClient.scala:26) at com.mendix.integration.util.PrivilegedUtil$$anon$1.run(PrivilegedUtil.scala:14) at java.base/java.security.AccessController.doPrivileged(Native Method) at com.mendix.integration.util.PrivilegedUtil$.$anonfun$withPrivileged$1(PrivilegedUtil.scala:13) at scala.util.Try$.apply(Try.scala:213) at com.mendix.integration.util.PrivilegedUtil$.withPrivileged(PrivilegedUtil.scala:13) at com.mendix.http.LoggableHttpClient.execute(LoggableHttpClient.scala:26) at com.mendix.integration.actions.microflow.RestCallAction.executeRequest(RestCallAction.scala:74) at com.mendix.integration.actions.microflow.RestCallAction.execute(RestCallAction.scala:54) at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:215) at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:165) at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:71) at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:49) at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:54) at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:147) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:152) at com.mendix.basis.actionmanagement.MicroflowCallBuilderImpl.execute(MicroflowCallBuilderImpl.scala:40) at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:76) at com.mendix.webui.actions.client.ExecuteMicroflowAction.$anonfun$apply$3(ExecuteMicroflowAction.scala:42) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$liftEither$1(RegularClientAction.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:43) at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:22) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:213) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:988) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:755) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:547) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1300) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1215) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:500) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:273) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Unknown Source)  
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Update 14 juli 2020
By adding ‘Connection’ ‘close’ to my REST call Headers for Docusign, we did not get the above error anymore.
Forcing to close the connection and avoid pooling did the trick.
 

answered