Calling POST from C# code does not process body correctly about plumber HOT 2 CLOSED

I think (but haven't tested) that you need to change your C# code to

content.Add(new ByteArrayContent(fileContent), "file", "file.xlsx");

See https://learn.microsoft.com/en-us/dotnet/api/system.net.http.multipartformdatacontent.add?view=net-7.0#system-net-http-multipartformdatacontent-add(system-net-http-httpcontent-system-string-system-string) - the second parameter is the name of the form variable

PS Sorry for slow response... I'm hoping Posit can put some <3 into Plumber again one day soon... // cc @schloerke @jcheng5

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I've been trying to get the same situation working today...

And ended up digging inside plumber and webutils as I couldn't get it to work.

Eventually I worked out that there's a problem with plumber's multipart parsing if the boundary marker is quoted - i.e. if it's presented in the content type headers like: multipart/form-data; boundary="custom_boundary_123" rather than multipart/form-data; boundary=custom_boundary_123

I've fixed this in my plumber fork - slodge@f0e37b8 - which is in #905 - but I don't have any timeline on if/when that might get merged.

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