.Net Core 6 web api Cors

Question

I have a web api in .net core 6 What I want is to enable cors from all origins. when I add policy just for localhost it works fine, but when I change my policy to allow any origin, I get the error - Access to XMLHttpRequest at '...' from origin 'http://localhost' 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.

My code:

...
/* NOT working */
builder.Services.AddCors(options =>
{
    options.AddPolicy(name: "any",
        policy =>
        {
            policy
            .AllowAnyOrigin()
            .AllowAnyMethod()
            .AllowAnyHeader()
            .AllowCredentials();
        });
});

/* Works fine*/
builder.Services.AddCors(options =>
{
    options.AddPolicy(name: "local",
        policy =>
        {
            policy
            .WithOrigins("http://localhost")
            .AllowAnyMethod()
            .AllowAnyHeader()
            .AllowCredentials();
        });
});


...


app.UseCors("any");
/* OR */
app.UseCors("local");

Any idea why?

D A · Accepted Answer · 2022-11-16 07:32:11Z

1

In ConfigureServices put:

services.AddCors();

and in Configure put:

app.UseCors(builder => builder.AllowAnyOrigin()
                              .AllowAnyHeader()
                              .AllowAnyMethod());

answered Nov 16, 2022 at 7:32

D A

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1 Comment

Hovi906 Over a year ago

I'm using core 6 so I don't have thos functions. I only have the program.cs file. I added services.AddCors(); and that worked. Thanks!

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