The type `HttpClient` is defined in an assembly that is not referenced
The type `HttpClient` is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
解決方案：
https://docs.unity3d.com/Manual/dotnetProfileAssemblies.html
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