C#•4mo ago

Multipart form upload prepends the file

I have a 3rd party that I am uploading files to via C#. For some reason, it looks like C# is prepending the files with additional information prior to uploading them and I can't figure out where it is occurring. Example prepend to CSV or JSON files

--<file-hash>
Content-Disposition: form-data; name=file; filename=<file-name>;
filename*=utf-8''<file-name>
{
...
}

--<file-hash>
Content-Disposition: form-data; name=file; filename=<file-name>;
filename*=utf-8''<file-name>
{
...
}

c#
HttpClient client = new();
MutlipartFormDataContent formData = [];
FileStream fileStream = new("filepath", FileMode.Open, FileAccess.Read);
StreamContent fileContent = new(fileStream);
formData.Add(fileContent, "file", "filename.csv");
client.PutAsync("url", formData);

c#
HttpClient client = new();
MutlipartFormDataContent formData = [];
FileStream fileStream = new("filepath", FileMode.Open, FileAccess.Read);
StreamContent fileContent = new(fileStream);
formData.Add(fileContent, "file", "filename.csv");
client.PutAsync("url", formData);

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Multipart form upload prepends the file