控制器 元数据（Metadata） Request 对象 更多端点 状态码操作 路由参数 Async / await POST 处理程序 处理 errors 最后一步 Express 方式 控制器 控制器层负责处理传入的请求, 并返回对客户端的响应。 要创建一个基本的控制器，你必须将 元数据 （metadata） 附加到类...

Other features Overview Execution context Exception filters Custom decorators Execute enhancers at the field resolver level Other features In the GraphQL world, there is a...

拦截器 基础 进阶 响应映射 异常映射 stream 重写 全局拦截器 拦截器 拦截器是@Interceptor () 装饰器的类。拦截器应该实现 NestInterceptor 接口。 拦截器具有一系列有用的功能，这些功能受面向切面编程（AOP）技术的启发。它们可以： 在方法执行之前/之后绑定额外的逻辑 转换从函数返回的结...

Lifecycle Events Lifecycle sequence Lifecycle events Usage Asynchronous initialization Application shutdown Lifecycle Events A Nest application, as well as every applicati...

Streaming files Streamable File class Cross-platform support Example Streaming files info Note This chapter shows how you can stream files from your HTTP application . The ...

Scalars Code first Schema first Scalars A GraphQL object type has a name and fields, but at some point those fields have to resolve to some concrete data. That’s where the sca...

Complexity Installation Getting started Field-level complexity Query/Mutation-level complexity Complexity warning Warning This chapter applies only to the code first appro...

MQTT Installation Overview Options Client Context Wildcards MQTT MQTT (Message Queuing Telemetry Transport) is an open source, lightweight messaging protocol, optimized ...

MQTT Installation Overview Options Client Context Wildcards MQTT MQTT (Message Queuing Telemetry Transport) is an open source, lightweight messaging protocol, optimized f...

HTTP module Installation Getting started Configuration Async configuration HTTP module Axios is richly featured HTTP client package that is widely used. Nest wraps Axios an...