Ship Microsoft.AspNetCore.WebUtilities, Microsoft.Net.Http.Headers as packages

[wtgodbe]

Fixes #48068. WebUtilities is used by blazor wasm projects that don't have access to the SharedFx (and it depends on Headers)

[Tratcher]

What about its dependencies like Microsoft.Net.Http.Headers?

[wtgodbe]

What about its dependencies like Microsoft.Net.Http.Headers?

Good call. Looks like the chain ends there, so I'll just update that one

[Tratcher]

We'll need to un-deprecate these packages on nuget.org.

[wtgodbe]

We'll need to un-deprecate these packages on nuget.org.

Deprecation applies to specific versions, so as soon as there's a new version the message should go away (unless you click on one of the deprecated versions)

[BrennanConroy]

Do you also need to add

<ItemGroup>
  <SupportedPlatform Include="browser" />
</ItemGroup>

?

[wtgodbe]

Do you also need to add

I wasn't aware of that, but from other projects in the repo it looks like I do - is there a doc about this somewhere I can look through?

[BrennanConroy]

There is the generic doc about it
https://learn.microsoft.com/en-us/dotnet/standard/analyzers/platform-compat-analyzer
From my understanding, if you add that item you'll now get analyzer warnings for using APIs that won't work in the browser. And since we're making these packages for the purpose of using in the browser it's probably a good idea to add it.