Extends RetryAfterPlugin with a clearer error message

Author: waldekmastykarz

dev-proxy-plugins/Behavior/RetryAfterPlugin.cs

@@ -56,16 +56,17 @@ private void ThrottleIfNecessary(ProxyRequestArgs e)
       var throttleInfo = throttler.ShouldThrottle(request, throttler.ThrottlingKey);
       if (throttleInfo.ThrottleForSeconds > 0)
       {
-        _logger?.LogRequest(new[] { $"Calling {request.Url} before waiting for the Retry-After period.", "Request will be throttled", $"Throttling on {throttler.ThrottlingKey}" }, MessageType.Failed, new LoggingContext(e.Session));
+        var messageLines = new[] { $"Calling {request.Url} before waiting for the Retry-After period.", "Request will be throttled.", $"Throttling on {throttler.ThrottlingKey}." };
+        _logger?.LogRequest(messageLines, MessageType.Failed, new LoggingContext(e.Session));
 
         throttler.ResetTime = DateTime.Now.AddSeconds(throttleInfo.ThrottleForSeconds);
-        UpdateProxyResponse(e, throttleInfo);
+        UpdateProxyResponse(e, throttleInfo, string.Join(' ', messageLines));
         break;
       }
     }
   }
 
-  private void UpdateProxyResponse(ProxyRequestArgs e, ThrottlingInfo throttlingInfo)
+  private void UpdateProxyResponse(ProxyRequestArgs e, ThrottlingInfo throttlingInfo, string message)
   {
     var headers = new List<HttpHeader>();
     var body = string.Empty;
@@ -82,7 +83,7 @@ private void UpdateProxyResponse(ProxyRequestArgs e, ThrottlingInfo throttlingIn
           new GraphErrorResponseError
           {
             Code = new Regex("([A-Z])").Replace(HttpStatusCode.TooManyRequests.ToString(), m => { return $" {m.Groups[1]}"; }).Trim(),
-            Message = BuildApiErrorMessage(request),
+            Message = BuildApiErrorMessage(request, message),
             InnerError = new GraphErrorResponseInnerError
             {
               RequestId = requestId,
@@ -98,5 +99,5 @@ private void UpdateProxyResponse(ProxyRequestArgs e, ThrottlingInfo throttlingIn
     e.ResponseState.HasBeenSet = true;
   }
 
-  private static string BuildApiErrorMessage(Request r) => $"Some error was generated by the proxy. {(ProxyUtils.IsGraphRequest(r) ? ProxyUtils.IsSdkRequest(r) ? "" : String.Join(' ', MessageUtils.BuildUseSdkForErrorsMessage(r)) : "")}";
+  private static string BuildApiErrorMessage(Request r, string message) => $"{message} {(ProxyUtils.IsGraphRequest(r) ? ProxyUtils.IsSdkRequest(r) ? "" : string.Join(' ', MessageUtils.BuildUseSdkForErrorsMessage(r)) : "")}";
 }