原文:net core 3.1 跨域 Cors 找不到 “Access-Control-Allow-Origin”
首先在ConfigureServices添加
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options.AddPolicy("any", builder =>
{
//builder.AllowAnyOrigin() //允许任何来源的主机访问
builder
.WithOrigins("http://*.*.*.*")//.SetIsOriginAllowedToAllowWildcardSubdomains()//设置允许访问的域
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials();//
});
});
services.AddControllers();
}
然后新增CorsMiddleware 类
public class CorsMiddleware
{
private readonly RequestDelegate _next;
public CorsMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext context)
{
if (!context.Response.Headers.ContainsKey("Access-Control-Allow-Origin"))
{
context.Response.Headers.Add("Access-Control-Allow-Origin", "*");
}
await _next(context);
}
}
然后在Configure 使用中间件
app.UseMiddleware<CorsMiddleware>();
