1、public void Configure(IApplicationBuilder app, IHostingEnvironment env)方法里面
不要加上:app.UseCors();
2、上面方法加上:
app.UseMiddleware<CorsMiddleware>();
3、中间代码如下:
public class CorsMiddleware
{
private readonly RequestDelegate next;
public CorsMiddleware(RequestDelegate next)
{
this.next = next;
}
public async Task Invoke(HttpContext context)
{
if (context.Request.Headers.ContainsKey(CorsConstants.Origin))
{
context.Response.Headers.Add("Access-Control-Allow-Origin", context.Request.Headers["Origin"]);
context.Response.Headers.Add("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS,HEAD,PATCH");
context.Response.Headers.Add("Access-Control-Allow-Headers", context.Request.Headers["Access-Control-Request-Headers"]);
context.Response.Headers.Add("Access-Control-Allow-Credentials", "true");
if (context.Request.Method.Equals("OPTIONS"))
{
context.Response.StatusCode = StatusCodes.Status200OK;
return;
}
}
await next(context);
}
}