我们遇到了 signalR 问题。我们有一个在信号器上运行的拍卖网站，用于实时竞价。我们修复了浏览器的一些问题，一切似乎都运行良好。然后我们在服务器上安装了新的 relic，并注意到每分钟我们都会在信号连接、重新连接和中止时收到 http 错误代码 400。这是屏幕截图:
根据 new relic，SignalR 连接和重新连接是该站点最耗时的操作。
这是SignalR后端代码(我们使用sql server作为signalr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 客户端看起来像这样，它很长，但大部分都是 jQuery 来影响 DOM，我将其全部包含在内，以防其中出现问题。
$(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) {
}
});
}
});
};
});
客户端或服务器信号器代码是否存在任何问题，可能需要更改以避免这些错误频繁发生？ 400 代码几乎每分钟都会出现。我对 signalR 很陌生，对如何用它编写有效的代码知之甚少。
网站中的实时出价确实有效，只是为了找到一种方法来避免这些持续出现的错误。任何解释 signalR 如何工作的帮助都会受到赞赏。
谢谢
最佳答案
我会尝试改变SignalR的传输方式:http://www.asp.net/signalr/overview/guide-to-the-api/hubs-api-guide-javascript-client#transport 并检查问题是否仍然存在。
如果可以从错误请求日志中获取 UserAgent，请尝试缩小出现 400 错误的浏览器范围。我认为，也许某些浏览器没有使用正确的传输方法进行连接。
关于asp.net - SignalR 导致服务器上出现错误请求 400，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36361543/