article Monitoring app task error HTTP protocol error 400 (The http request header is incorrect.) in Official Support Articles https://community.qlik.com/t5/Official-Support-Articles/Monitoring-app-task-error-HTTP-protocol-error-400-The-http/ta-p/1903862 <P data-unlink="true">The Qlik Sense License and Operations Monitor App may fail with:</P> <P data-unlink="true"><FONT face="courier new,courier">HTTP protocol error 400 (The http request header is incorrect.)</FONT></P> <P>&nbsp;</P> <H4><STRONG><FONT color="#339966">Environment</FONT></STRONG></H4> <UL> <LI><LI-PRODUCT title="Qlik Sense Enterprise on Windows" id="qlikSenseEnterpriseWindows"></LI-PRODUCT>&nbsp;all versions</LI> </UL> <P>&nbsp;</P> <H3><FONT color="#339966"><STRONG>Resolution</STRONG></FONT></H3> <P>&nbsp;</P> <P>Verify that the Qlik Sense server domain URL is correctly added as an allowed host in the virtual proxy.</P> <P><STRONG>Example:</STRONG> If your Qlik Sense Enterprise on Windows server URL is&nbsp;<FONT face="courier new,courier">qlikserver1.domain.com</FONT>, add&nbsp;<FONT face="courier new,courier">qlikserver1.domain.com</FONT>.&nbsp;</P> <P>See&nbsp;<A href="https://community.qlik.com/t5/Knowledge/How-to-configure-the-WebSocket-origin-allow-list-and-best/ta-p/1716765" target="_blank" rel="noopener">How to configure the WebSocket origin allow list and best practices</A>&nbsp;for instructions.</P> <P>&nbsp;</P> <P>&nbsp;</P> Mon, 14 Mar 2022 09:57:15 GMT Jack_Guo 2022-03-14T09:57:15Z Monitoring app task error HTTP protocol error 400 (The http request header is incorrect.) https://community.qlik.com/t5/Official-Support-Articles/Monitoring-app-task-error-HTTP-protocol-error-400-The-http/ta-p/1903862 <P data-unlink="true">The Qlik Sense License and Operations Monitor App may fail with:</P> <P data-unlink="true"><FONT face="courier new,courier">HTTP protocol error 400 (The http request header is incorrect.)</FONT></P> <P>&nbsp;</P> <H4><STRONG><FONT color="#339966">Environment</FONT></STRONG></H4> <UL> <LI><LI-PRODUCT title="Qlik Sense Enterprise on Windows" id="qlikSenseEnterpriseWindows"></LI-PRODUCT>&nbsp;all versions</LI> </UL> <P>&nbsp;</P> <H3><FONT color="#339966"><STRONG>Resolution</STRONG></FONT></H3> <P>&nbsp;</P> <P>Verify that the Qlik Sense server domain URL is correctly added as an allowed host in the virtual proxy.</P> <P><STRONG>Example:</STRONG> If your Qlik Sense Enterprise on Windows server URL is&nbsp;<FONT face="courier new,courier">qlikserver1.domain.com</FONT>, add&nbsp;<FONT face="courier new,courier">qlikserver1.domain.com</FONT>.&nbsp;</P> <P>See&nbsp;<A href="https://community.qlik.com/t5/Knowledge/How-to-configure-the-WebSocket-origin-allow-list-and-best/ta-p/1716765" target="_blank" rel="noopener">How to configure the WebSocket origin allow list and best practices</A>&nbsp;for instructions.</P> <P>&nbsp;</P> <P>&nbsp;</P> Mon, 14 Mar 2022 09:57:15 GMT https://community.qlik.com/t5/Official-Support-Articles/Monitoring-app-task-error-HTTP-protocol-error-400-The-http/ta-p/1903862 Jack_Guo 2022-03-14T09:57:15Z