flying-hero
96f6318101
新增: - backend/venv/ - Python 虚拟环境 - backend/start.sh - 启动脚本（使用虚拟环境） - backend/requirements.txt - 依赖列表 - .gitignore - 忽略虚拟环境和缓存文件 说明: - 每个项目使用独立虚拟环境 - 避免依赖冲突 - 启动脚本自动创建和激活虚拟环境
on-headers
Execute a listener when a response is about to write headers.
Installation
This is a Node.js module available through the
npm registry. Installation is done using the
npm install command:
$ npm install on-headers
API
var onHeaders = require('on-headers')
onHeaders(res, listener)
This will add the listener listener to fire when headers are emitted for res.
The listener is passed the response object as it's context (this). Headers are
considered to be emitted only once, right before they are sent to the client.
When this is called multiple times on the same res, the listeners are fired
in the reverse order they were added.
Examples
var http = require('http')
var onHeaders = require('on-headers')
http
.createServer(onRequest)
.listen(3000)
function addPoweredBy () {
// set if not set by end of request
if (!this.getHeader('X-Powered-By')) {
this.setHeader('X-Powered-By', 'Node.js')
}
}
function onRequest (req, res) {
onHeaders(res, addPoweredBy)
res.setHeader('Content-Type', 'text/plain')
res.end('hello!')
}
Testing
$ npm test