Program.cs

using HelloWebAPI.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddCors(options =>
{
    options.AddPolicy(
        "AllowSpecificOrigin",
        builder => builder.WithOrigins("http://127.0.0.1:3001").AllowAnyHeader().AllowAnyMethod()
    );
});

builder.Services.Configure<WeatherApiOptions>(builder.Configuration.GetSection("WeatherApi"));
builder.Services.AddHttpClient<IWeatherService, WeatherService>(client =>
{
    client.BaseAddress = new Uri("https://api.weatherapi.com/v1/");
});
builder.Services.AddScoped<IWeatherService, WeatherService>();

var app = builder.Build();

app.UseCors("AllowSpecificOrigin");

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();
app.UseAuthorization();

app.MapControllers();

app.Run();