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Unity/Scripts/Utility/UnityWebRequestAwaiter.cs

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+using UnityEngine;
+using UnityEngine.Networking;
+using System;
+using System.Runtime.CompilerServices;
+public class UnityWebRequestAwaiter : INotifyCompletion
+{
+    private UnityWebRequestAsyncOperation asyncOp;
+    private Action continuation;
+
+    public UnityWebRequestAwaiter(UnityWebRequestAsyncOperation asyncOp)
+    {
+        this.asyncOp = asyncOp;
+        asyncOp.completed += OnRequestCompleted;
+    }
+
+    public bool IsCompleted { get { return asyncOp.isDone; } }
+
+    public void GetResult() { }
+
+    public void OnCompleted(Action continuation)
+    {
+        this.continuation = continuation;
+    }
+
+    private void OnRequestCompleted(AsyncOperation obj)
+    {
+        if (continuation != null)
+            continuation();
+    }
+}
+
+public static class ExtensionMethods
+{
+    public static UnityWebRequestAwaiter GetAwaiter(this UnityWebRequestAsyncOperation asyncOp)
+    {
+        return new UnityWebRequestAwaiter(asyncOp);
+    }
+}
+
+/*
+// Usage example:
+UnityWebRequest www = new UnityWebRequest();
+// ...
+await www.SendWebRequest();
+Debug.Log(req.downloadHandler.text);
+*/