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ASP.NET Core CORS combining policies; enablecors in controller vs midleware configuration


ASP.NET Core CORS combining policies; enablecors in controller vs midleware configuration

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ASP.NET Core CORS combining policies; enablecors in controller vs midleware configuration
Tag : chash , By : Matt Leacock
Date : November 24 2020, 05:49 AM

it should still fix some issue Why would you want to? The result is: CORS is enabled or its not (for one resource).
You can either do this by using the Attribute-Syntax ([EnableCors]) on your controller / your action-method, or make use of the fluent-api-design like in example with
services.AddCors(options => options...);

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ASP .NET Core use multiple CORS policies


Tag : javascript , By : Tigre
Date : March 29 2020, 07:55 AM
this will help To set a default CORS policy use app.UseCors(string policyName) overload.
Your CORS requests will be failing because you are rejecting all headers and methods. From what I read, the CORS specification states that you shouldn't set any headers at all if any of the checks fail. See implementation here, this is most likely why your client will be receiving the standard No 'Access-Control-Allow-Origin' header is present error, as no headers are added at all, even though the Origin check passes.
public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy("Example",
            builder => builder.WithOrigins("http://www.example.com")
                                .AllowAnyHeader()
                                .AllowAnyMethod());
        options.AddPolicy("AllowAll",
            builder => builder.AllowAnyOrigin()
                                .AllowAnyHeader()
                                .AllowAnyMethod());
    });

    services.AddMvc();
    //other configure stuff
}


public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    app.UseCors("AllowAll"); //Default

    app.UseMvcWithDefaultRoute();
}

Cors configuration in .NET Core 2.0


Tag : asp.net-core , By : Ernie
Date : March 29 2020, 07:55 AM
may help you . Both your methods add * as origin, but builder.AllowAnyOrigin() also clear all other registered origins inside builder, so it is better to use it.
From the source code:
public CorsPolicyBuilder WithOrigins(params string[] origins)
{
     foreach (var req in origins)
     {
        _policy.Origins.Add(req);
     }

     return this;
}

public CorsPolicyBuilder AllowAnyOrigin()
{
     _policy.Origins.Clear();
     _policy.Origins.Add(CorsConstants.AnyOrigin);
     // `CorsConstants.AnyOrigin` conts has `*` as value
     return this;
}

ASP.NET Core CORS configuration not working for Firefox


Tag : chash , By : kokok13
Date : March 29 2020, 07:55 AM
may help you . I found the problem and it was a really weird one. I was reading an older blog which talked about CORS and ASP.NET Core. Then I stumbled upon this comment which said that the solution worked for Kestrel, but not for IIS Express. So I changed my build configuration to not use IIS Express and it now works flawlessly for both browsers. If you want this to work for IIS Express, then you don't edit your Startup.cs, but you edit your application.config file which probably is located in your project root folder.

EnableCors C# .NET Core 3


Tag : chash , By : koder
Date : March 29 2020, 07:55 AM
To fix the issue you can do Unsure if anything changed in Core 3.0, but in 2.2 I would solve it like this: add this to ConfigureServices
services.AddCors(options =>
        {
            options.AddPolicy("CorsPolicy",
                builder => builder.AllowAnyOrigin()
                .AllowAnyMethod()
                .AllowAnyHeader());
        });
app.UseCors("CorsPolicy");

Which authorization policy is used if multiple policies are specified (e.g. middleware configuration, controller/action


Tag : chash , By : keird
Date : March 29 2020, 07:55 AM
Hope that helps To access MyController , it should match both policies : the DefaultPolicy from RequireAuthorization and the custom Full policy . In addition , the DefaultPolicy could be updated by providing a policy to the UseAuthorization middleware :
services.AddAuthorization(options =>
{
    options.DefaultPolicy = new AuthorizationPolicyBuilder()
        .RequireAuthenticatedUser()
        .RequireClaim("claimName")
        .Build();
});
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