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Node.js function to invoke as the final step to respond to HTTP request.
This is a Node.js module available through the npm registry. Installation is done using the npm install command:
$ npm install finalhandlerconst finalhandler = require('finalhandler')Returns function to be invoked as the final step for the given req and res. This function is to be invoked as fn(err). If err is falsy, the handler will write out a 404 response to the res. If it is truthy, an error response will be written out to the res or res will be terminated if a response has already started.
When an error is written, the following information is added to the response:
- The res.statusCode is set from err.status (or err.statusCode). If this value is outside the 4xx or 5xx range, it will be set to 500.
- The res.statusMessage is set according to the status code.
- The body will be the HTML of the status code message if env is 'production', otherwise will be err.stack.
- Any headers specified in an err.headers object.
The final handler will also unpipe anything from req when it is invoked.
By default, the environment is determined by NODE_ENV variable, but it can be overridden by this option.
Provide a function to be called with the err when it exists. Can be used for writing errors to a central location without excessive function generation. Called as onerror(err, req, res).
const finalhandler = require('finalhandler')
const http = require('http')
const server = http.createServer((req, res) => {
const done = finalhandler(req, res)
done()
})
server.listen(3000)const finalhandler = require('finalhandler')
const fs = require('fs')
const http = require('http')
const server = http.createServer((req, res) => {
const done = finalhandler(req, res)
fs.readFile('index.html', (err, buf) => {
if (err) return done(err)
res.setHeader('Content-Type', 'text/html')
res.end(buf)
})
})
server.listen(3000)const finalhandler = require('finalhandler')
const http = require('http')
const serveStatic = require('serve-static')
const serve = serveStatic('public')
const server = http.createServer((req, res) => {
const done = finalhandler(req, res)
serve(req, res, done)
})
server.listen(3000)const finalhandler = require('finalhandler')
const fs = require('fs')
const http = require('http')
const server = http.createServer((req, res) => {
const done = finalhandler(req, res, { onerror: logerror })
fs.readFile('index.html', (err, buf) => {
if (err) return done(err)
res.setHeader('Content-Type', 'text/html')
res.end(buf)
})
})
server.listen(3000)
function logerror (err) {
console.error(err.stack || err.toString())
}