The status line message (a.k.a, the reason phrase) from the response from the origin service is not being translated from the HttpClient response into the HttpServletResponse. It should be.
The code dealing with the HttpClient response to the HttpServletResponse can be found here:
- The status line message from the origin service makes it to the client.
- Docs are added to show how an API can use the Scripting filter to get the old behavior.
- Recipes for scripts!