Private cloud-hosted NuGet server receives a 0-byte upload from a "nuget push" command over the internet

[aleksander-oven]

I've outlined my problem on StackOverflow in a bit more detail, but I also wanted to ask the .NET SDK community, directly (because I was so advised).

Here's the gist...

Both of these commands:

nuget.exe push -Source <url> -ApiKey <key> <package-file>
dotnet nuget push -s <url> -k <key> <package-file>

result in a 0-byte upload to my private NuGet service that I'm hosting in the cloud, behind a Cloudflare tunnel. The service is based on BaGetter project.

However, a raw Postman HTTP PUT request works fine; i.e. there is a non-0 byte body present when request is received by the server. I determined this by substituting BaGetter for my own simple C# ASP.NET app that logs all received requests in detail. I even tried building my own simplified nuget.exe client and made a PUT request using HttpClient, which works fine.

What could possibly be a reason that nuget push commands don't work (i.e. the uploaded length is always 0 bytes)?

As a test, I tried disabling my Cloudflare HSTS requirement and lowered the TLS version requirement right down to 1.0. Still no success.