Choose and configure the right @axiosleo/koapp Application class - KoaApplication for HTTP, SocketApplication for TCP sockets, WebSocketApplication for WebSocket. Use when building a server with koapp, configuring ports, listen host, session, static files, body parser, ping heartbeat, managing socket connections, or deciding between HTTP/TCP/WS transport.
Organize route handlers into reusable classes by extending the @axiosleo/koapp Controller base class. Use when grouping related handlers, reusing response helpers (this.success/failed/result/response/error/log), sharing state across handlers, or scaffolding service modules for a koapp project.
Validate and serialize structured data with the @axiosleo/koapp Model class powered by validatorjs. Use when creating typed payload objects, running rules like required/integer/email/min/max, converting between JSON and plain objects, listing properties, or automatically raising HttpError(400) on validation failure inside a koapp handler.
Send structured responses from @axiosleo/koapp handlers using success/failed/result/response/error helpers and HttpError/HttpResponse classes. Use when returning JSON envelopes, custom HTTP status codes, raw HTML/text, error responses, or when setting response headers from a koapp route handler or controller method.
Define routes, path parameters, validators, and nested routers with the @axiosleo/koapp Router class. Use when declaring HTTP/WebSocket/TCP routes in koapp, adding path params like /users/{:id}, composing nested routers, attaching per-route middlewares or after-handlers, validating params/query/body with validatorjs rules, or using shortcut helpers (get/post/put/patch/delete/any).
Overview of the @axiosleo/koapp framework - a Koa-based web, TCP socket, and WebSocket framework for Node.js. Use when the user mentions @axiosleo/koapp, koapp, needs to pick the right Application class, or wants to understand what the framework exports (KoaApplication, SocketApplication, WebSocketApplication, Router, Controller, Model, response helpers, SSE middleware).
Stream Server-Sent Events (SSE) from a @axiosleo/koapp Koa route using the KoaSSEMiddleware. Use when pushing real-time events to a browser over HTTP, implementing progress bars, live logs, notifications, or EventSource endpoints with text/event-stream, including ctx.koa.sse.send/close/keepAlive APIs.