CORS error

[Mahesh Machina]

Hi Team,

We are experiencing CORS error at random times in File manager control. If we restart the site problem get solved but appears again later. we are using Chrome browser.

Please suggest if you have any recommendations in identifying the root cause.

Thank you

[Sharon Sanchez Selvaraj]

Hi Mahesh, 

Thanks for contacting Syncfusion support.  

We checked the reported scenario but we were unable to replicate your issue. However, we suggest you to follow the below step to overcome the CORS issue. 

Kindly insert this following snippet into your Web.config file of your MVC application. 

<httpProtocol> 

<customHeaders> 

<add name="Access-Control-Allow-Origin" value="*" /> 

<add name="Access-Control-Allow-Headers" value="Content-Type" /> 

<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" /> 

</customHeaders> 

</httpProtocol> 

Please get back to us if you need any further assistance. 

Regards, 

Sharon Sanchez S. 

[Mahesh Machina]

Thanks Sharon for quick response.

I have these configured already, but we still face CORS error intermittently. Even in your website i found this issue.

Please find the same attached

Attachment: File_Manager_error_4327d08d.zip

[Sharon Sanchez Selvaraj]

Hi Mahesh, 

We have checked your reported issue in the provided site, but we were unable to replicate it in our end. Files are loaded correctly within FileManager. 

Please check with the below screenshot for your reference. 

 

Ensure the network connectivity once in your end and to know more about CORS error, please check the below links. 

https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api 

https://stackoverflow.com/questions/32949675/cors-error-mvc-and-web-api 

https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSAllowOriginNotMatchingOrigin 

Please get back to us if you need any further assistance. 

Regards, 

Sharon Sanchez S.