Response to preflight request doesn't pass access control

Mandar Shinde

7y25.6k

Dear All,

I have created small project using Angular 6 and ASP .Net MVC 5. I have uploaded my those project with help of member of this forum. Thanks to them for helping me.

I got stuck again I was facing problem related to refresh, to overcome on that problem I get come to know that I have to use URL rewrite. So I just follows those steps, now I can refresh the page but I am getting error and It is related to CORS.

Before this I was using that code as localhost but now I want to connect with domain.

I am getting following error :-

Access to XMLHttpRequest at 'http://www.angulardemo.in/eapp/api/Login' from origin 'http://angulardemo.in' 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.

How can I overcome on above problem?

Please let me any easy solution. Any suggestion will be acceptable.

Thanking You in advance.

5 Replies

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Gajendra Jangid7y ago
hello dear,

please have a look at below link:

https://www.codeproject.com/Tips/1109392/Response-to-Preflight-Request-Doesnt-Pass-Access-C
https://community.powerbi.com/t5/Developer/Error-No-Access-Control-Allow-Origin-header-is-present-on-the/td-p/350280
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Sanwar Ranwa7y ago
Hello Mandar

You need to enable CORS in your application ,Check these Links to enable cors and know what is cors

https://www.c-sharpcorner.com/article/enable-cors-in-asp-net-webapi-2/

https://enable-cors.org/server_aspnet.html

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

https://www.hexacta.com/2014/09/15/How-to-enable-CORS-on-your-Web-API
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Jignesh Kumar7y ago
Hi MAndar,

You need to enable CORS for your application. It says you are trying to access resource from other domain. Cross-origin resource sharing (CORS) So you need to enable cors for your application

https://stackoverflow.com/questions/54085677/how-to-configure-angular-6-with-net-core-2-to-allow-cors-from-any-host

Enable cors in MVC-5
https://forums.asp.net/t/2013856.aspx?enable+CORS+MVC+5

Difference options
https://www.csharpstar.com/asp-net-core-cross-origin-requests-cors/
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Mandar Shinde7y ago
hello Vipul Sir,
Will you please explain me more in details how can I do that , I am asking you because I am very new in this technology.
Thank you for replying.
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Vipul Jain7y ago
Create a CORS (cross-domain) entry in web.config file. Header information needs to be included in the response from server. (Not in your request.)

The server should return a header similar to the following with the response-

Access-Control-Allow-Origin: yourhostname:port

Also, You need to make sure HTTPS is used everywhere.

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