//配置HTTP请求管道
public void Configure(IApplicationBuilder app, IHostingEnvironment env, CustomDbContext dbContext, ILogger <Startup> logger)
{
//初始化数据库
dbContext.Database.Migrate();
dbContext.Seed();
app.UseSession();
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
//app.UseExceptionHandler("/Home/Error");
app.UseExceptionHandler(new ExceptionHandlerOptions
{
ExceptionHandler = async context =>
{
//获取全局异常
var error = context.Features.Get <IExceptionHandlerFeature>().Error;
//把异常信息记录到日志
logger.LogError(error.Message);
//根据请求类型返回响应结果
bool isApiRequest = context.Request.Path.StartsWithSegments("/api");
if (isApiRequest)
{
context.Response.StatusCode = 504;
context.Response.ContentType = "application/json";
await context.Response.WriteAsync("{\"code\":-1,\"success\":false,\"message\":\"服务器异常\"}");
}
else
{
context.Response.Redirect("/home/error");
await Task.CompletedTask;
}
}
});
}
//使用Map构建中间件
app.Map("/unauthorizedPath", builder =>
{
builder.Run(async context =>
{
context.Response.StatusCode = 401;
context.Response.ContentType = "text/plain;charset=utf-8";
await context.Response.WriteAsync("权限不足");
});
});
//使用MapWhen构建中间件
app.MapWhen(httpContext => httpContext.Request.Path.StartsWithSegments("/nonExistPath"), builder =>
{
builder.Run(async context =>
{
context.Response.StatusCode = 404;
context.Response.ContentType = "text/plain;charset=utf-8";
await context.Response.WriteAsync("资源不存在");
});
});
//使用Use构建中间件
app.Use(async(context, next) =>
{
if (!context.Request.Headers.ContainsKey("X-Remote-IP"))
{
context.Request.Headers.Add("X-Remote-IP", context.Request.Host.Host);
}
//执行下一个请求委托
await next.Invoke();
//在响应开始后修改HttpResponse会引发异常
//context.Response.Headers.Add("X-Service-IP", "127.0.0.1");
});
//自定义中间件
app.UseMiddleware <LogMiddleware>();
app.UseStaticFiles();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}