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[Source] SignalR adds cross-domain support for remote access

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Posted on 2021-4-23 12:39:20 | | | |
Requirements: The frontend and backend are not on the same domain name, so there is a cross-domain problem, how can the frontend connect to the remote SignalR?

First, the js code is as follows:

When I try to connect at the beginning, I get the following error:

Access to fetch at 'http://localhost:27939/testHub/negotiate?negotiateVersion=1' from origin 'http://localhost:5009' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
ASP.NET Core 3.1 adds allow cross-domain

The ConfigureServices code is as follows:


The Configure code is as follows:

If you try to connect again, you will get the following error:



Access to fetch at 'http://localhost:27939/testHub/negotiate?negotiateVersion=1' from origin 'http://localhost:5009' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'.
Modify the ConfigureServices code again as follows:



Problem solved!





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