在Startup的ConfigureServices()中添加services.AddCors()
在Startup的Configure()中添加app.UseCors(); 保证其在app.UseMvc();之前
app.UseCors(builder => builder
.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials());
app.UseMvc();
https://stackoverflow.com/questions/44379560/how-to-enable-cors-in-asp-net-core-webapi
原文：https://www.cnblogs.com/zhangzhiping35/p/10980314.html