3075143 - "404 Not Found" error message when involving SAP Web dispatcher or other proxy

"404 Not Found" error message is raised when calling SAP Web dispatcher URL, like, http://<Web dispatcher hostname>/<service name>

Calling backend system directly, no issue, like, http://<backend system hostname>/<service name>

In high level trace, SAP Web dispatcher has already forwarded the request to the right backend system, also ICM has dispatched the request to a work process successfully, but the work process set 404 for this request, like:

• dev_w*(level 2 trace):
  ...
  M   ICTSYS: SetStatus 404 Not foundICTSYS

• SAP NetWeaver
• ABAP Platform

404 Not Found, web dispatcher, SICF, service, is/HTTP/virt_host_1 , KBA , BC-CST-IC , Internet Communication Manager , BC-CST-WDP , Web Dispatcher , Problem