请求

请求头相关

import koa =  require('koa');
const app = new koa();
app.use(async (ctx, next) => {
    const token = ctx.request.header['x-access-token'];
    console.log(token);
    ctx.request.header['x-auth-user'] = 'PPG007';
    await next();
});
app.use((ctx) => {
    console.log(ctx.request.header['x-auth-user'])
})
app.listen(8080, '0.0.0.0');

http 方法相关

使用下面的代码可以实现 methodOverWrite

import koa =  require('koa');
const app = new koa();
app.use(async (ctx, next) => {
    console.log(ctx.request.method)
    ctx.request.method = 'PUT';
    await next();
});
app.use((ctx) => {
    console.log(ctx.request.method)
})
app.listen(8080, '0.0.0.0');

请求路径相关

app.use(async (ctx, next) => {
    const req = ctx.request;
    console.log(req.url);
    console.log(req.originalUrl);
    console.log(req.href);
    console.log(req.origin);
    console.log(req.path);
    await next();
});

Tips

可以通过修改 req.url 实现对 url 的重写。

参数相关

获取 query 参数。

import koa =  require('koa');
const app = new koa();
app.use(async (ctx, next) => {
    const req = ctx.request;
    console.log(req.querystring);
    console.log(JSON.stringify(req.query)); // query get response
    console.log(req.search); // include ? prefix
    await next();
});

获取 body 参数：

引入一个中间件：

yarn add koa-bodyparser
yarn add -D @types/koa-bodyparser

import koa =  require('koa');
const app = new koa();
import bodyParser = require('koa-bodyparser');
app.use(bodyParser());
app.use(async (ctx, next) => {
    console.log(ctx.request.body);
    await next();
});
app.use((ctx) => {
    console.log(ctx.request.method)
})
app.listen(8080, '0.0.0.0');

指定参数解析选项：

app.use(bodyParser({
    enableTypes: ['json'],
    encoding: 'utf-8',
    jsonLimit: '2mb',
    detectJSON: (ctx) => {
        // 指定什么情况下解析 JSON
        return /\.json$/i.test(ctx.path);
    },
    onerror(err, ctx) {
        ctx.throw(400, err);
    },
}));

客户端信息相关

app.use((ctx) => {
    console.log(ctx.request.ip)
})