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.NET Core 3.0 - HTTP/2 support

You maybe think this is a bad title for this blog post? HTTP/2 support was already available for .NET Core 3.0. So why a blog post with the release of .NET Core 3.0?

The reason is that although it was possible to host an ASP.NET Core 2.0 application behind an HTTP/2 endpoint, the HttpClient class didn’t had support for it!

There are 2 ways that can be used to enable HTTP/2:

Enable HTTP/2 at the instance level

To enable HTTP/2 support at the instance level, you can set the DefaultRequestVersion when creating the HttpClient instance:

For example, the following code creates an HttpClient instance using HTTP/2 as its default protocol:

Of course even better is to use the HttpClientFactory to create and configure the HttpClient:

Enable HTTP/2 at the request level

It is also possible to create a single request using the HTTP/2 protocol:

Remark: Remember that HTTP/2 needs to be supported by both the server and the client. If either party doesn't support HTTP/2, both will use HTTP/1.1.

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