`vcpkg install --head inja` fails to get the tarball from GitHub

vcpkg_inja_head_error.md

$ ../vcpkg/vcpkg install --triplet x64-linux --head inja
Computing installation plan...
The following packages will be built and installed:
    inja[core]:x64-linux -> 3.2.0 (+HEAD)
Starting package 1/1: inja:x64-linux
Building package inja[core]:x64-linux from HEAD...
-- Downloading https://api.github.com/repos/pantor/inja/git/refs/heads/master -> pantor-inja-master.tar.gz.version...
-- Downloading https://api.github.com/repos/pantor/inja/git/refs/heads/master... Failed. Status: 22;"HTTP response code said error"
CMake Error at scripts/cmake/vcpkg_download_distfile.cmake:184 (message):
      
      Failed to download file.
      If you use a proxy, please check your proxy setting. Possible causes are:
      
      1. You are actually using an HTTP proxy, but setting HTTPS_PROXY variable
         to `https://address:port`. This is not correct, because `https://` prefix
         claims the proxy is an HTTPS proxy, while your proxy (v2ray, shadowsocksr
         , etc..) is an HTTP proxy. Try setting `http://address:port` to both
         HTTP_PROXY and HTTPS_PROXY instead.
      
      2. You are using Fiddler. Currently a bug (https://github.com/microsoft/vcpkg/issues/17752)
         will set HTTPS_PROXY to `https://fiddler_address:port` which lead to problem 1 above.
         Workaround is open Windows 10 Settings App, and search for Proxy Configuration page,
         Change `http=address:port;https=address:port` to `address`, and fill the port number.
      
      3. You proxy's remote server is out of service.
      
      In future vcpkg releases, if you are using Windows, you no longer need to set
      HTTP(S)_PROXY environment variables. Vcpkg will simply apply Windows IE Proxy
      Settings set by your proxy software. See (https://github.com/microsoft/vcpkg-tool/pull/49)
      and (https://github.com/microsoft/vcpkg-tool/pull/77)
      
      Otherwise, please submit an issue at https://github.com/Microsoft/vcpkg/issues

Call Stack (most recent call first):
  scripts/cmake/vcpkg_from_github.cmake:195 (vcpkg_download_distfile)
  ports/inja/portfile.cmake:1 (vcpkg_from_github)
  scripts/ports.cmake:141 (include)


Error: Building package inja:x64-linux failed with: BUILD_FAILED
Please ensure you're using the latest portfiles with `./vcpkg update`, then
submit an issue at https://github.com/Microsoft/vcpkg/issues including:
  Package: inja:x64-linux
  Vcpkg version: 2021-05-05-unknownhash

Additionally, attach any relevant sections from the log files above.