[mapguide-users] An error occurred during startup - "Failed to Fetch"

[Shane Martin]

Jackie you're a genius!

The chrome dev tools pinpointed the error.  "Redirect has been blocked by
CORS policy: No 'Access-Control-Allow-Origin' header"

The issue is because the Same Origin Policy is preventing the fetch
response from being received due to the originating/receiving domains being
different.

The fix was to add a "Access-Control-Allow-Origin: *" header.

Thanks again for pointing me in the right direction.  I often forget about
the chrome dev tools.


Shane Martin
Manager of Information Technology
Town Of Ingersoll
519-485-0120 ext. 6264

On Fri., Aug. 5, 2022, 3:40 p.m. Jackie Ng, <jumpinjackie at gmail.com> wrote:

> Assuming you are referring to the mapguide-react-layout viewer (that
> sounds a lot like an error message this viewer will throw), then the best
> course of action is to open your browser developer tools (general shortcut
> key is F12) and look for failed requests in the network tab.
>
> Given this is a fetch error during startup, I suspect it must be a failure
> in one of the requests to:
>
>    - Fetch the WebLayout or ApplicationDefiniton resource
>    - Create the runtime map from the Map Definition from the WebLayout or
>    ApplicationDefinition fetched above.
>
> But looking at the failed requests in the network tab in the browser dev
> tools will give the definitive answer on what is the failing request.
>
> Hope that helps.
>
> - Jackie
>
> You wrote:
>
> Are users are receiving a "An error occurred during startup - Failed to
>
> Fetch" error when opening the mapguide viewer in a web browser.  Anyone
>
> know what this cause of this error would be? or what log files may shed
>
> some light on it?
>
> Thanks.
>
> *Shane Martin*
>
> Manager of Information Technology
>
> Town Of Ingersoll
>
> 519-485-0120 ext. 6264
>
>
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