Request Streaming will be part of .NET 9: https://github.com/dotnet/runtime/pull/91295, https://github.com/dotnet/runtime/pull/91699

This allows the usage of request streaming when supported. In addition to that it also needs to be opted in via:

request.Options.Set(BrowserHttpHandler.EnableStreamingRequest, true);

For streaming requests over HTTP 1 the following setting is also required:

request.SetBrowserRequestOption("allowHTTP1ForStreamingUpload", true);

Currently this feature Experimental Web Platform features needs to be enabled in chrome://flags/

• Index.razor: streaming inputs

• Upload.razor: upload multipart form file

• BrowserHttpHandler.cs: modified version of the dotnet/runtime code

• dotnet runtime issue: https://github.com/dotnet/runtime/issues/36634
• Google Chrome feature status: https://www.chromestatus.com/feature/5274139738767360
• ReadableStream MDN: https://developer.mozilla.org/docs/Web/API/ReadableStream/ReadableStream
• web.dev article which the index example is based on: https://web.dev/fetch-upload-streaming/