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                                            <p><a href="/m/category/%EA%B8%B0%ED%83%80">기타</a></p><h2>ASP.NET Core: 1. CORS 문제 해결</h2>
                    <p><cite>
                        <span>Seonghwan</span>
                    </cite>
                </p></div>
                <p><time>2021. 6. 27. 16:56</time>
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                    <p data-ke-size="size16">임시방편으로 로컬에서라도 동작하게 구현했습니다.</p>

<pre id="code_1624780527981" data-ke-language="cs" data-ke-type="codeblock"><code>public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            var corsBuilder = new CorsPolicyBuilder();
            corsBuilder.AllowAnyHeader();
            corsBuilder.AllowAnyMethod();
            corsBuilder.AllowAnyOrigin();

            services.AddCors(options =&gt;
            {
                options.AddPolicy("SiteCorsPolicy", corsBuilder.Build());
            });

            services.AddRouting(r =&gt; r.SuppressCheckForUnhandledSecurityMetadata = true);


            services.AddControllersWithViews();
            services.AddRazorPages();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseWebAssemblyDebugging();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

            app.UseBlazorFrameworkFiles();
            app.UseStaticFiles();

            app.UseCors("SiteCorsPolicy");
            app.Use((context, next) =&gt;
            {
                context.Items["__CorsMiddlewareInvoked"] = true;
                return next();
            });

            app.UseRouting();
            app.UseAuthorization();
            app.UseEndpoints(endpoints =&gt;
            {
                endpoints.MapRazorPages();
                endpoints.MapControllers();
                endpoints.MapFallbackToFile("index.html");
            });
        }
    }</code></pre>

<pre id="code_1624780550773" data-ke-language="cs" data-ke-type="codeblock"><code>    [EnableCors("SiteCorsPolicy")]
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };

        private readonly ILogger&lt;WeatherForecastController&gt; logger;

        public WeatherForecastController(ILogger&lt;WeatherForecastController&gt; logger)
        {
            this.logger = logger;
        }

        [HttpGet]
        public IEnumerable&lt;WeatherForecast&gt; Get()
        {
            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index =&gt; new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }</code></pre>
                                                            
                    
					
                    
                    
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Fireplace

samueljeon

임시방편으로 로컬에서라도 동작하게 구현했습니다.
 
public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        public IConfiguration Configuration { get; }
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            var corsBuilder = new CorsPolicyBuilder();
            corsBuilder.AllowAnyHeader();
            corsBuilder.AllowAnyMethod();
            corsBuilder.AllowAnyOrigin();
            services.AddCors(options =>
            {
                options.AddPolicy("SiteCorsPolicy", corsBuilder.Build());
            });
            services.AddRouting(r => r.SuppressCheckForUnhandledSecurityMetadata = true);
            services.AddControllersWithViews();
            services.AddRazorPages();
        }
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseWebAssemblyDebugging();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }
            app.UseBlazorFrameworkFiles();
            app.UseStaticFiles();
            app.UseCors("SiteCorsPolicy");
            app.Use((context, next) =>
            {
                context.Items["__CorsMiddlewareInvoked"] = true;
                return next();
            });
            app.UseRouting();
            app.UseAuthorization();
            app.UseEndpoints(endpoints =>
            {
                endpoints.MapRazorPages();
                endpoints.MapControllers();
                endpoints.MapFallbackToFile("index.html");
            });
        }
    }
 
    [EnableCors("SiteCorsPolicy")]
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private static readonly string[] Summaries = new[]
        {
            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
        };
        private readonly ILogger<WeatherForecastController> logger;
        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            this.logger = logger;
        }
        [HttpGet]
        public IEnumerable<WeatherForecast> Get()
        {
            var rng = new Random();
            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
            {
                Date = DateTime.Now.AddDays(index),
                TemperatureC = rng.Next(-20, 55),
                Summary = Summaries[rng.Next(Summaries.Length)]
            })
            .ToArray();
        }
    }

ASP.NET Core: 1. CORS 문제 해결

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