sockjs-client 1.5.0. sockjs.js:2999 WebSocket is closed before the connection is established

[erictor]

On an Angular 11 application, this never happened until I updated to .NET 5 (from .NET Core 3.1), Angular 11, and sockjs-client 1.5.0. This error occurs almost every time the application is started (i.e. on browser reload). An impact of this error is that Live Reload doesn't work.

sockjs.js:2999
WebSocket connection to 'wss://localhost:44308/sockjs-node/976/rlcfczpw/websocket' 
failed: WebSocket is closed before the connection is established.

WebSocketTransport.close @sockjs.js:2999
SockJS._transportTimeout @sockjs.js:844
invokeTask               @zone-evergreen.js:402
runTask                  @zone-evergreen.js:174
invokeTask               @zone-evergreen.js:483
ZoneTask.invoke          @zone-evergreen.js:472
timer                    @zone-evergreen.js:2538
setTimeout (async)      
scheduleTask             @zone-evergreen.js:2559
scheduleTask             @zone-evergreen.js:389
scheduleTask             @zone-evergreen.js:217
scheduleMacroTask        @zone-evergreen.js:240
scheduleMacroTaskWithCurrentZone           @zone-evergreen.js:675
(anonymous)              @zone-evergreen.js:2574
proto.<computed>         @zone-evergreen.js:971
SockJS._connect          @sockjs.js:823
SockJS._receiveInfo      @sockjs.js:803
g                        @sockjs.js:66
EventEmitter.emit        @sockjs.js:86
(anonymous)              @sockjs.js:567
g                        @sockjs.js:66
EventEmitter.emit        @sockjs.js:86
(anonymous)              @sockjs.js:374
g                        @sockjs.js:66
EventEmitter.emit        @sockjs.js:86
xhr.onreadystatechange   @sockjs.js:1598
wrapFn                   @zone-evergreen.js:759
invokeTask               @zone-evergreen.js:402
runTask                  @zone-evergreen.js:174
invokeTask               @zone-evergreen.js:483
invokeTask               @zone-evergreen.js:1596
globalZoneAwareCallback  @zone-evergreen.js:1622
XMLHttpRequest.send (async)     
scheduleTask             @zone-evergreen.js:2845
scheduleTask             @zone-evergreen.js:389
scheduleTask             @zone-evergreen.js:217
scheduleMacroTask        @zone-evergreen.js:240
scheduleMacroTaskWithCurrentZone           @zone-evergreen.js:675
(anonymous) @zone-evergreen.js:2878
proto.<computed>         @zone-evergreen.js:971
AbstractXHRObject._start @sockjs.js:1606
(anonymous)              @sockjs.js:1495
invokeTask               @zone-evergreen.js:402
runTask                  @zone-evergreen.js:174
invokeTask               @zone-evergreen.js:483
ZoneTask.invoke          @zone-evergreen.js:472
timer                    @zone-evergreen.js:2538
setTimeout (async)      
scheduleTask             @zone-evergreen.js:2559
scheduleTask             @zone-evergreen.js:389
scheduleTask             @zone-evergreen.js:217
scheduleMacroTask        @zone-evergreen.js:240
scheduleMacroTaskWithCurrentZone           @zone-evergreen.js:675
(anonymous)              @zone-evergreen.js:2574
proto.<computed>         @zone-evergreen.js:971
AbstractXHRObject        @sockjs.js:1494
XHRLocalObject           @sockjs.js:2915
InfoAjax                 @sockjs.js:356
InfoReceiver._getReceiver  @sockjs.js:536
InfoReceiver.doXhr         @sockjs.js:556
(anonymous)              @sockjs.js:525
setTimeout (async)      
InfoReceiver             @sockjs.js:524
SockJS                   @sockjs.js:731
SockJSClient             @SockJSClient.js:43
initSocket               @socket.js:20
(anonymous)              @client:176
QM51                     @polyfills.js:13429
__webpack_require__      @bootstrap:84
1                        @object-set-prototype-of.js:24
__webpack_require__      @bootstrap:84
checkDeferredModules     @bootstrap:45
webpackJsonpCallback     @bootstrap:32
(anonymous)              @polyfills.js:1

[github-actions]

This issue has been inactive for 30 days. It will be in closed in 5 days without any new activity.

[erictor]

Webpack Live Reloading broke when I moved from .NET 3.1 to .NET 5.0.1 - Project debugging with VS 2019 16.8, using Angular 10

https://developercommunity2.visualstudio.com/t/webpack-live-reloading-broke-when-i-moved-from-net/1313178

EDIT: That issue was closed and GitHub Issue dotnet/aspnetcore#29478 was Opened in its place. It doesn't appear that anyone is looking into it though.

[erictor]

This is now under review by @captainsafia in dotnet/aspnetcore#29478.

[erictor]

Based on the fact that this error is under active review in dotnet/aspnetcore#29478 and no one appears to be looking at this here, I think I'll Close this.