The type or namespace name 'HttpClient' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'HttpClient' could not be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

'SecurityPermissionAttribute' is obsolete: 'Code Access Security is not supported or honored by the runtime.' (https://aka.ms/dotnet-warnings/SYSLIB0003)

'SecurityAction' is obsolete: 'Code Access Security is not supported or honored by the runtime.' (https://aka.ms/dotnet-warnings/SYSLIB0003)

Member 'UnexpectedApiResponseException.GetObjectData(SerializationInfo, StreamingContext)' overrides obsolete member 'Exception.GetObjectData(SerializationInfo, StreamingContext)'. Add the Obsolete attribute to 'UnexpectedApiResponseException.GetObjectData(SerializationInfo, StreamingContext)'.