Cors issue (bearer token base authentication) in ASP.NET web api and ionic 4

Question

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When i’m uploading my project on hosting site and data is coming from there only,it worked fine on localhost but when i uploaded my webapi on hosting server it’s not working data is not coming and i’m not able to logged into my application.

Error is below:
1.) Error:
Access to XMLHttpRequest at ‘http://stylen.in/token’ from origin ‘http://localhost:8100’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
2.) Error:
POST http://stylen.in/token net::ERR_FAILED

What I have tried:

I tried different ways, in postman data is coming perfectly and i also able to log in.

Posted 1-Mar-20 19:03pm

Member 14704249

Updated 1-Mar-20 19:45pm

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Viswanatha Swamy 2-Mar-20 1:42am

Are you accessing the hosted Web API using your application from "http://localhost:8100"? Please advise. In this case you need to add the URL to the CORS section. Please refer to the URL: https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api

Member 14704249 2-Mar-20 2:06am

I go through your link i already did those steps in my Webapi and also in ionic project.(those errors are not coming on my localhost but when i uploaded Webapi than only errors are coming.)

Viswanatha Swamy 2-Mar-20 3:08am

In your local the error will not come as both the UI and Web API will have http(s)://localhost. Now that you have hosted Web API and trying to access it from your local the domains are different. In this case, you have to whitelist the domains from which you want the Web API to be accessed. When you try through the postman it will go through without any issues. Please refer this URL https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin

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Viswanatha Swamy · Answer 1 · 2020-03-01T19:45:00

Are you accessing the hosted Web API using your application from "http://localhost:8100"? Please advise. In this case you need to add the URL to the CORS section. Please refer to the URL: https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/enabling-cross-origin-requests-in-web-api

Sample Code for ASP.net Core just for reference

C#

public void ConfigureServices( IServiceCollection services) 
{ 
	// Add framework services. 
	services.AddMvc(); 

	services.AddCors( options = > {
	 options.AddPolicy("DemoCorsPolicy", c = > c.WithOrigins("http://localhost:8100")); 
	}); 
} 

public void Configure( IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) 
{ 
	app.UseMvc(); 
	app.UseCors("DemoCorsPolicy"); 
}