我正在尝试在我的ASP上启用跨起源资源共享。NET核心Web API，但我卡住了。
EnableCors属性接受字符串类型的policyName作为参数:
// Summary:
// Creates a new instance of the Microsoft.AspNetCore.Cors.Core.EnableCorsAttribute.
//
// Parameters:
// policyName:
// The name of the policy to be applied.
public EnableCorsAttribute(string policyName);
policyName是什么意思，如何在ASP上配置CORS。NET核心Web API?
当前回答
ASP。NET Core 6:
var MyAllowSpecificOrigins = "_myAllowSpecificOrigins";
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddCors(options =>
{
options.AddPolicy(name: MyAllowSpecificOrigins,
builder =>
{
builder.WithOrigins("http://example.com",
"http://www.contoso.com");
});
});
// services.AddResponseCaching();
builder.Services.AddControllers();
var app = builder.Build();
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseCors(MyAllowSpecificOrigins);
app.UseAuthorization();
app.MapControllers();
app.Run();
更多样品请参考官方文档。
ASP。NET Core 3.1和5.0:
你必须在应用程序启动时在ConfigureServices方法中配置CORS策略:
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(o => o.AddPolicy("MyPolicy", builder =>
{
builder.WithOrigins("http://example.com")
.AllowAnyMethod()
.AllowAnyHeader();
}));
// ...
}
builder中的CorsPolicyBuilder允许您根据需要配置策略。你现在可以使用这个名字将策略应用到控制器和动作上:
[EnableCors("MyPolicy")]
或者把它应用到每一个请求上:
public void Configure(IApplicationBuilder app)
{
app.UseCors("MyPolicy");
// ...
// This should always be called last to ensure that
// middleware is registered in the correct order.
app.UseMvc();
}
其他回答
得到这个工作与。net Core 3.1如下
确保你把UseCors代码放在app.UseRouting()之间;和app.UseAuthentication ();
app.UseHttpsRedirection();
app.UseRouting();
app.UseCors("CorsApi");
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints => {
endpoints.MapControllers();
});
然后将此代码放在ConfigureServices方法中
services.AddCors(options =>
{
options.AddPolicy("CorsApi",
builder => builder.WithOrigins("http://localhost:4200", "http://mywebsite.com")
.AllowAnyHeader()
.AllowAnyMethod());
});
在基本控制器上面我放了这个
[EnableCors("CorsApi")]
[Route("api/[controller]")]
[ApiController]
public class BaseController : ControllerBase
现在我所有的控制器都将继承BaseController，并启用CORS
根据Henk的回答，我已经能够提出特定的域，我想允许的方法，以及我想启用CORS的头:
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
options.AddPolicy("AllowSpecific", p => p.WithOrigins("http://localhost:1233")
.WithMethods("GET")
.WithHeaders("name")));
services.AddMvc();
}
用法:
[EnableCors("AllowSpecific")]
如果你在IIS上托管，一个可能的原因是你得到这个是因为IIS阻塞选项动词。我为此花了将近一个小时:
一个明显的迹象是在OPTIONS请求期间出现404错误。
要解决这个问题，您需要显式地告诉IIS不要阻止OPTIONS请求。
进入请求过滤:
确保允许使用OPTIONS:
或者，只是做一张网。配置如下设置:
<system.webServer>
<security>
<requestFiltering>
<verbs>
<remove verb="OPTIONS" />
<add verb="OPTIONS" allowed="true" />
</verbs>
</requestFiltering>
</security>
</system.webServer>
这涵盖每个端点。如果你想阻止某个端点，使用这个注释[DisableCors] 这里描述得很好。 https://learn.microsoft.com/en-us/aspnet/core/security/cors?view=aspnetcore-5.0
在app.authentication()和app.routing()之间添加app.usecors(policyName)在Configure方法中。 在configureService方法中
services.AddCors(options => options.AddPolicy(name: mypolicy, builder => { builder.AllowAnyHeader().AllowAnyMethod().AllowAnyOrigin(); }));
在每个控制器中添加[EnableCors("mypolicy")]
[EnableCors("mypolicy")]
[Route("api/[controller]")] [ApiController]
public class MyController : ControllerBase
eg:-
namespace CompanyApi2
{
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.
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
options.AddPolicy(name: mypolicy,
builder =>
{
builder.AllowAnyHeader().AllowAnyMethod()
.AllowAnyOrigin();
})); //add this
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
services.AddScoped<IDatarepository, DatabaseRepository>();
}
public string mypolicy = "mypolicy";
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseHsts();
}
app.UseCors(mypolicy); //add this
app.UseHttpsRedirection();
app.UseMvc();
}
}
}
得到这个工作与。net Core 3.1如下:
在ConfigureServices()方法中:
public void ConfigureServices(IServiceCollection services)
{
...
services.AddCors();
...
}
在Configure()方法中:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
...
app.UseCors(builder =>
builder.AllowAnyOrigin()
.AllowAnyHeader()
.AllowAnyMethod()
);
...
}
