can not access(http 404) the *.md file in hosted mode

[sc1994]

Describe the bug

This is my reproduction step

cd try-main/Samples/

dotnet try  --verbose --port 4242 hosted

curl -i http://localhost:4242/Setup.md

Did this error occur while using dotnet try or online?

• [x] dotnet-try
• [ ] online

What kind of error was it?

• [ ] User Interface (UI): For example the output never displayed
• [x] Service Error: For example "The service is temporarily unavailable. We are working on it"
• [ ] Other:

Screenshots

If applicable, add screenshots to help explain your problem.

Please complete the following:

• OS
  • [ ] Windows 10
  • [ ] macOS
  • [x] Linux (windows 10 wsl2 2004.2020.812.0)
  • [ ] iOS
  • [ ] Android
• Browser
  • [x] Chrome
  • [ ] Edge
  • [ ] Safari