Services does not contain a definition for AddCors for solve Cross site origin problem in WASM

I want to get some data from a web api, and I write this code:

var response = await Client.GetAsync("https://SomeURL/Action");

when I run this code in button click I get this error:

Access to fetch at 'https://SomeURL/Action' from origin 'http://OtherURL' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

so for solve this problem I was trying to add this code in program.cs in Blazor application:

builder.Services.AddCors(options =>{    options.AddPolicy("CorsPolicy", builder => builder.WithOrigins("https://SomeURL/")           .AllowAnyHeader()           .AllowAnyMethod()           .AllowCredentials()           .SetIsOriginAllowed((host) => true));});

but Services does not contain a definition for AddCors. How can I solve this issue? Thanks

Edit 1)

I create very simple built-in web api:

[ApiController][Route("[controller]")]public class WeatherForecastController : ControllerBase{    private static readonly string[] Summaries = new[]    {"Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"    };    [HttpGet]    public IEnumerable<WeatherForecast> Get()    {        return Enumerable.Range(1, 5).Select(index => new WeatherForecast        {            Date = DateTime.Now.AddDays(index),            TemperatureC = Random.Shared.Next(-20, 55),            Summary = Summaries[Random.Shared.Next(Summaries.Length)]        })        .ToArray();    }

and I get the result:

When I want to connect to this web api I get CORS error. and I change program.cs in Web API project:

var builder = WebApplication.CreateBuilder(args);builder.Services.AddControllers();builder.Services.AddCors(options =>{    options.AddPolicy("CorsPolicy", builder =>                builder.WithOrigins("http://localhost:5179")       .AllowAnyHeader()       .AllowAnyMethod()       .AllowCredentials()       .SetIsOriginAllowed((host) => true));});var app = builder.Build();app.UseCors();app.UseHttpsRedirection();app.UseAuthorization();app.MapControllers();app.Run();

and in Blazor project I have this:

@page "/counter"@inject HttpClient Client<PageTitle>Counter</PageTitle><h1>Counter</h1><p role="status">Current count: @currentCount</p><button class="btn btn-primary" @onclick="IncrementCount">Click me</button>@code {    private int currentCount = 0;    private async Task IncrementCount()    {        currentCount++;        var response = await Client.GetAsync("https://localhost:7229/weatherforecast");    }}

Please help me to resolve the problem.