.net core web api实现跨域

跨域的配置写在api的项目里

一.允许任何来源
1.在Startup.cs类的ConfigureServices方法中添加srevices.AddCors服务

services.AddCors(options => {
                options.AddPolicy("any", 
                    builder => {builder.AllowAnyOrigin() //允许任何来源的主机访问
                        .AllowAnyMethod()//允许任何方法访问
                        .AllowAnyHeader();//允许任何标头
                    });
            });

2.在Startup.cs类的Configure方法中注册服务

app.UseCors("any");

二.允许特定的ip访问

1.在Startup.cs类的ConfigureServices方法中添加srevices.AddCors服务

services.AddCors(options => options.AddPolicy("any", policy =>
                {
                    // 设定允许跨域的来源，有多个可以用','隔开
                    policy.WithOrigins("http://localhost:21632", "http://localhost:24661")
                    .AllowAnyHeader()//允许任何标头
                    .AllowAnyMethod()//允许任何方法访问
                    .AllowCredentials();//允许凭据的策略
                }));

2.在Startup.cs类的Configure方法中注册服务

app.UseCors("any");

三.使用属性启动Cors
1.在接口上添加[EnableCors]属性

2.在Startup.cs类的ConfigureServices方法中添加srevices.AddCors服务

services.AddCors(options =>
            {
                options.AddPolicy("any",
                    builder =>
                    {
                        builder.WithOrigins("http://localhost:51345",
                                            "http://localhost:24661");
                    });
                options.AddPolicy("AnotherPolicy",
                    builder =>
                    {
                        builder.WithOrigins("http://www.contoso.com")
                                            .AllowAnyHeader()
                                            .AllowAnyMethod();
                    });
            });

3.在Startup.cs类的Configure方法中注册服务

app.UseCors();