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How to Enable HTTP/2 and HTTP/3 in C# for Faster Network Performance

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Developers using C# can significantly improve application network performance by upgrading from HTTP/1.1 to HTTP/2 or HTTP/3 via .NET's HttpClient. HTTP/2, supported since .NET Core 3.0, introduces multiplexing and HPACK header compression, reducing header size by up to 95% and allowing multiple requests over a single TCP connection. HTTP/3, available in stable form since .NET 7, builds on the QUIC protocol over UDP, eliminating head-of-line blocking and enabling faster connection establishment through combined transport and security handshakes. Developers can configure the desired protocol version using HttpVersionPolicy settings on HttpClient or individual request messages. A fallback strategy can also be implemented to attempt HTTP/3 first, then HTTP/2, before defaulting to HTTP/1.1.

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