How do I track down the cause of a client side blazor.server.js exception?

[DavidThielen]

I am getting the following exception every once in awhile. There's no consistency to it. It happens on different pages and all those pages come up fine 99.9% of the time.

So how do I figure out what the problem is?

Failed to load resource: the server responded with a status of 404 ()
blazor.server.js:1 

[2023-12-18T05:44:39.951Z] Information: Normalizing '_blazor' to 'https://localhost:7229/_blazor'.
blazor.server.js:1 

[2023-12-18T05:44:39.987Z] Information: WebSocket connected to wss://localhost:7229/_blazor?id=bWqvl7TndLX5oCm_PxYpsg.

806 Mixed Content: The page at '<URL>' was loaded over HTTPS, but requested an insecure element '<URL>'. This request was not upgraded to HTTPS because its URL's host is an IP address.
:7229/LouisHowe.web.styles.css:1 

Failed to load resource: the server responded with a status of 404 ()
blazor.server.js:1 

[2023-12-18T05:47:27.845Z] Error: Connection disconnected with error 'Error: WebSocket closed with status code: 1006 (no reason given).'.
log @ blazor.server.js:1
blazor.server.js:1 

[2023-12-18T05:47:30.850Z] Information: Normalizing '_blazor' to 'https://localhost:7229/_blazor'.
blazor.server.js:1 

[2023-12-18T05:47:30.859Z] Information: WebSocket connected to wss://localhost:7229/_blazor?id=PNLgX_Zjo6sB044QZgdrww.

25Mixed Content: The page at '<URL>}' was loaded over HTTPS, but requested an insecure element '<URL>'. This request was not upgraded to HTTPS because its URL's host is an IP address.
blazor.server.js:1 

[2023-12-18T05:48:29.669Z] Error: System.Threading.Tasks.TaskCanceledException: A task was canceled.
   at Microsoft.JSInterop.JSRuntime.InvokeAsync[TValue](Int64 targetInstanceId, String identifier, Object[] args)
   at Microsoft.JSInterop.JSRuntimeExtensions.InvokeVoidAsync(IJSRuntime jsRuntime, String identifier, Object[] args)
   at Microsoft.AspNetCore.Components.Server.Circuits.RemoteNavigationManager.<>c__DisplayClass13_0.<<NavigateToCore>g__PerformNavigationAsync|0>d.MoveNext()
log @ blazor.server.js:1
blazor.server.js:1 

[2023-12-18T05:48:29.670Z] Information: Connection disconnected.
2blazor.server.js:1 

Uncaught Error: No interop methods are registered for renderer 1
    at T (blazor.server.js:1:13936)
    at blazor.server.js:1:13842
    at D (blazor.server.js:1:14025)
    at k (blazor.server.js:1:13816)
    at P.dispatchGlobalEventToAllElements (blazor.server.js:1:16418)
    at P.onGlobalEvent (blazor.server.js:1:15611)
    at HTMLElement.raise (events-interseptor-e0b24870.js:1:917)
    at HTMLElement.raiseEvent (adaptivedropdowncomponents-c1306555.js:1:3137)
    at HTMLElement.raiseEnableAdaptivity (adaptivedropdowncomponents-c1306555.js:1:3178)
    at set adaptivityEnabled [as adaptivityEnabled] (adaptivedropdowncomponents-c1306555.js:1:2098)
LouisHowe.web.styles.css:1 

Failed to load resource: the server responded with a status of 404 ()

[javiercn]

Check your network tab, something is sending a request to an HTTP URL and the browser is blocking it