SignalR 導致伺服器上出現錯誤請求 400

我們遇到了 signalR 的問題。我們有一個在 Signalr 上執行的拍賣網站，用於實時出價。我們修復了瀏覽器的一些問題，一切似乎都執行良好。然後我們在我們的伺服器上安裝了新的 relic，並註意到每分鐘我們都會在 signalr 連接、重新連接和中止時收到 http 錯誤程式碼 400。這是一個螢幕截圖：

SignalR 連接和重新連接是站點根據新遺跡最耗時的操作。

這是 SignalR 後端程式碼（我們使用 sql server 作為信號器背板）：

public class SignalRHub : Hub
{
   public void BroadCastMessage(String msg)
   {
       var hubContext = GlobalHost.ConnectionManager.GetHubContext<SignalRHub>();

       hubContext.Clients.All.receiveMessage(msg);
   }
}

public partial class Startup
{
   public void Configuration(IAppBuilder app)
   {
       string appString=string.Empty;

       //Gets the connection string.
       if (System.Configuration.ConfigurationSettings.AppSettings["SignaRScaleoutConn"] != null)
       { 
           appString = System.Configuration.ConfigurationSettings.AppSettings["SignaRScaleoutConn"].ToString();
       }

       GlobalHost.DependencyResolver.UseSqlServer(appString);
       GlobalHost.Configuration.ConnectionTimeout = TimeSpan.FromMinutes(15); //I added this timeout, but it is not required.
       app.MapSignalR();
   }
}

javascript客戶端看起來是這樣的，它很長，但是大部分是jQuery來影響DOM，我把它都包括在內，以防裡面可能有問題。

$(function () {

           var chatProxy = $.connection.signalRHub;

           $.connection.hub.start();

           chatProxy.client.receiveMessage = function (msg) {

               var all = $(".soon").map(function () {

                   var hiddenModelId = $("#hiddenListingId");

                   if (msg == hiddenModelId.val()) {

                       $.ajax({
                           async: "true",
                           url: "/Listing/AuctionRemainingTime",
                           type: "POST",
                           dataType: 'json',
                           data: '{ "listingID": "' + msg + '"}',
                           contentType: "application/json; charset=utf-8",
                           success: function (data) {
                               if (data != null) {

                                   SoonSettings.HasReloadedThisTick = false;

                                   var element = document.getElementById(msg);

                                   var obj = JSON.parse(data)

                                   // For Clock Counter End Date Time Interval 
                                   // Adds 2 minutes to the soon clock when bid is close to finishing.
                                   var hdID = "hdn" + obj.ListingId;
                                   var hdValue = $("#" + hdID);
                                   if (obj.EndDate != hdValue.val()) {

                                       SoonSettings.HasUpdated = false; //Allows clock to change color once it gets under two minutes.

                                       $('#' + hdID).val(obj.EndDate);
                                       Soon.destroy(element);
                                       Soon.create(element, { //Recreates clock with the before 2 minute tick event.
                                           'due': 'in ' + obj.Seconds + ' seconds',
                                           'layout':'group label-uppercase',
                                           'visual':'ring cap-round progressgradient-00fff6_075fff ring-width-custom gap-0',
                                           'face':'text',
                                           'eventTick': 'tick'
                                       });
                                   }

                                   var highbid = obj.HighBidderURL;

                                   // For Date Ends Info.
                                   var ListingEndDate = $("#tdAuctionListingEndDate");

                                   if (obj.EndDate != ListingEndDate.val()) {
                                       $('#' + hdID).val(obj.EndDate);
                                       ListingEndDate.text(obj.EndDate + " Eastern");
                                       ListingEndDate.effect("pulsate", { times: 5 }, 5000);
                                   }
                                   else
                                   {
                                       $(".Bidding_Current_Price").stop(true, true); ///Removes the pulsating effect.
                                       $(".Bidding_Current_Price").removeAttr("style"); //Removes unnecessary attribute from HTML.
                                   }

                                   //Bid div notification.
                                   if (obj.AcceptedActionCount.replace(/[^:]+:*/, "") > 0) {

                                       if (obj.Disposition != '' && obj.Disposition != null) {
                                           if (obj.Disposition == "Neutral") {
                                               $("#spanNeutralBid").show();
                                               $("#divOutbidNotification").hide();
                                               $("#spanPositiveBid").hide();
                                               $("#divProxyBidNotification").hide();
                                           }
                                           else if (obj.Disposition == "Positive") {
                                               $("#spanPositiveBid").show();
                                               $("#divOutbidNotification").hide();
                                               $("#spanNeutralBid").hide();
                                               $("#divProxyBidNotification").hide();
                                           }
                                           else if (obj.Disposition == "Negative") {
                                               $("#divOutbidNotification").show();
                                               $("#spanNeutralBid").hide();
                                               $("#spanPositiveBid").hide();
                                               $("#divProxyBidNotification").hide();
                                           }
                                           else {
                                               $("#divOutbidNotification").hide();
                                               $("#spanNeutralBid").hide();
                                               $("#divProxyBidNotification").hide();
                                               $("#spanPositiveBid").hide();     
                                           }

                                       }
                                   }

                                   // For Highlight Current Price when it is Updated
                                   var hdCurrentPrice = $("#hdnCurrentPrice");

                                   if (obj.CurrentPrice != hdCurrentPrice.val()) {

                                       $(".Bidding_Current_Price").text(obj.CurrentPrice);
                                       $(".Bidding_Current_Price").effect("pulsate", { times: 5 }, 5000);
                                       $("#hdnCurrentPrice").val(obj.CurrentPrice);
                                   }
                                   else {
                                       $(".Bidding_Current_Price").stop(true, true);
                                       $(".Bidding_Current_Price").removeAttr("style");
                                   }

                                   // For ReservePrice Status
                                   $("#spanReservePriceStatus").html(obj.ReservePriceStatus);
                                   $("#smallReservePriceStatus").html(obj.ReservePriceStatus);

                                   // For Bid Count

                                   var spanBidCounter = $("#spanBidCount");

                                   $(spanBidCounter).text(obj.AcceptedActionCount);


                                   var stringAppend = "<tr id='trhHighBidder'><td><strong>HighBidder</strong></td>";
                                   stringAppend += "<td>";
                                   if (obj.isAdmin == true) {
                                       stringAppend += "<a id='anchorHighBid' href=" + obj.HighBidderURL + ">";
                                       stringAppend += "<span id='spanHighBidder'>" + obj.CurrentListingActionUserName + "</span>"
                                       stringAppend += "</a>";
                                   }
                                   else {
                                       stringAppend += "<span id='spanHighBidderAnonymous'>" + obj.CurrentListingActionUserName + "</span>";
                                   }
                                   stringAppend += "</td></tr>";

                                   if (obj.AcceptedActionCount.replace(/[^:]+:*/, "") > 0) {
                                       if ($("#tblAuctionDetail").find("#rowHighBidder").length > 0) {

                                           if ($("#tblAuctionDetail").find("#trhHighBidder").length > 0) {
                                               $("#trhHighBidder").remove();
                                           }
                                       }
                                       else {

                                           //add tr to table
                                           if (!$("#tblAuctionDetail").find("#trhHighBidder").length > 0) {
                                               $('#tblAuctionDetail > tbody > tr:eq(6)').after(stringAppend);
                                           }
                                       }
                                   }

                                   // For High Bidder

                                   if (obj.isAdmin) {

                                       var anchorElement = $("#anchorHighBid");
                                       $(anchorElement).attr("href", obj.HighBidderURL);

                                       var spanHighBidder = $("#spanHighBidder");
                                       $(spanHighBidder).text(obj.CurrentListingActionUserName);
                                   }
                                   else {
                                       var spanAdminHighBid = $("#spanHighBidderAnonymous");
                                       $(spanAdminHighBid).text(obj.CurrentListingActionUserName)
                                   }

                               }
                           },
                           error: function (xhr, textStatus, errorThrown) {

                           }
                       });
                   }
               });
           };

       });

客戶端或伺服器信號器程式碼是否有任何問題，可能需要更改以避免這些錯誤經常發生？400 程式碼幾乎每分鐘都會出現。我對 signalR 很陌生，對如何使用它編寫有效的程式碼知之甚少。

網站中的實時競價確實有效，只是想辦法避免這些不斷出現的錯誤。任何解釋signalR如何工作的幫助都值得讚賞。

謝謝，

我會嘗試更改 SignalR 的傳輸方式：http ://www.asp.net/signalr/overview/guide-to-the-api/hubs-api-guide-javascript-client#transport 並檢查是否有問題持續存在。

如果可以從錯誤請求日誌中獲取 UserAgent，請嘗試縮小哪些瀏覽器出現 400 錯誤。我認為，也許，某些瀏覽器沒有使用正確的傳輸方法連接。

引用自：https://stackoverflow.com/questions/36361543