我正在尝试让 Web Sockets 作为使用 SignalR 2.4.2 的 ASP.NET 4.8 Framework 应用程序的协议。它可以在本地主机上运行 Windows 10 Pro 的 Visual Studio 2019 上正常运行。它在 Windows 2016 服务器(不是 Azure)上失败,并在 Chrome 85 中出现以下错误:
signalr?v=igzza46L1gfiUBzl96WDUmuI9_CUHV_qqd0Kd-fDr8A1:1 WebSocket 连接到 'wss://someServer.org/signalr/connect?transport=webSockets&clientProtocol=2.1&connectionToken=...&connectionData=%5B%7B%22name%22%3A%22myhub% 22%7D%5D&tid=0' 失败:WebSocket 握手期间出错:net::ERR_CONNECTION_RESET
and
No transport could be initialized successfully. Try specifying a different transport or none at all for auto initialization.
at Object.error (signalr?vv=...:1)
at g (signalr?vv=...:1)
at v (signalr?vv=...:1)
at h.transportFailed (signalr?vv=...:1)
at signalr?vv=...:1
at WebSocket.e.socket.e.socket.onclose (signalr?vv=...:1)
在服务器上打开此 URLhttps://myserver.org/signalr/negotiate
获取 SignalR 详细信息会产生以下结果:
Url "/signalr"
ConnectionToken "..."
ConnectionId "..."
KeepAliveTimeout 20
DisconnectTimeout 30
ConnectionTimeout 110
TryWebSockets true
ProtocolVersion "1.2"
TransportConnectTimeout 5
LongPollDelay 0
以下是 Firefox 中针对失败调用的控制台响应链:
SignalR: Client subscribed to hub 'myhub'.
SignalR: Negotiating with '/signalr/negotiate?clientProtocol=2.1&connectionToken=...&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D'.
SignalR: webSockets transport starting.
SignalR: Connecting to websocket endpoint 'wss://myServer.org/signalr/connect?transport=webSockets&clientProtocol=2.1&connectionToken=...%3D%3D&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D&tid=8'
Firefox can’t establish a connection to the server at wss://myServer.org/signalr/connect?transport=webSockets&clientProtocol=2.1&connectionToken=...&connectionData=%5B%7B%22name%22%3A%22myhub%22%7D%5D&tid=8.
SignalR: Websocket closed.
SignalR: Closing the Websocket.
SignalR: webSockets transport failed to connect. Attempting to fall back.
SignalR: No fallback transports were selected.
SignalR: Stopping connection.
SignalR: Fired ajax abort async = true.
WebSockets 已使用以下说明安装在服务器上:
- https://learn.microsoft.com/en-us/iis/configuration/system.webserver/websocket#windows-server-2012-or-windows-server-2012-r2 https://learn.microsoft.com/en-us/iis/configuration/system.webserver/websocket#windows-server-2012-or-windows-server-2012-r2
- https://learn.microsoft.com/en-us/iis/configuration/system.webserver/websocket#how-to-configure-websocket https://learn.microsoft.com/en-us/iis/configuration/system.webserver/websocket#how-to-configure-websocket
在客户端上,它使用以下内容:
$.connection.hub.logging = true;
$.connection.hub.start({ transport: ['webSockets'] })
.done(function () {
// ...
}).fail(e => {
console.log(e);
});;
此外,BrowserLink 在 Visual Studio 中被禁用,因为这被认为是导致问题的可能原因。
研究的其他文章:
- https://stackoverflow.com/a/37531108/177416 https://stackoverflow.com/a/37531108/177416
- https://github.com/SignalR/SignalR/issues/3148 https://github.com/SignalR/SignalR/issues/3148
有人建议删除Application_PreSendRequestHeaders
from Global.asax.cs
但这并没有改变服务器上的任何内容。
我知道 SignalR 支持其他协议,但我正在尝试让 Web 套接字正常工作。
Thanks.
Update:Web 套接字协议也适用于服务器本身的本地主机,通过 RDP 登录并使用浏览器打开页面。