restify 6.x to 7.x migration guide


restify 7.x comes with a completely new router and middleware logic that brings significant performance improvement to your application. From v7.0.0 restify uses the Radix Tree based find-my-way package as a router backend.

Breaking Changes

Server returns RequestCloseError instead of RequestAbortedError

Server returns RequestCloseError instead of RequestAbortedError in the case of the request was terminated by the client for some reason.

The new version of restify never returns RequestAbortedError.

Non-strict routing is gone

Option strictRouting is removed createServer({ strictRouting: false }). Strict routing is the new default.

Path trailing slash at the end

/path and /path/ are not the same thing in restify v7.x. Use ignoreTrailingSlash: true server option if you don’t want to differentiate them from each other.

Path must to start with /

In restify 7.x path must start with a /. For example server.get('foo') is invalid, change it to server.get('/foo').

If you use enroute be sure that you updated it to the latest version.

Different RegExp usage in router path and wildcards

restify’s new router backend find-my-way has limited RegExp support.

Guide to define paths

To register a parametric path, use the colon before the parameter name. For wildcard use the star. Remember that static routes are always inserted before parametric and wildcard.

// parametric
server.get('GET', '/example/:userId', (req, res, next) => {}))
server.get('GET', '/example/:userId/:secretToken', (req, res, next) => {}))

// wildcard
server.get('GET', '/example/*', (req, res, next) => {}))

Regular expression routes are supported as well, but pay attention, RegExp are very expensive in term of performance!

// parametric with RegExp
server.get('GET', '/example/:file(^\\d+).png', () => {}))

RegExp path chunks needs to be between parentheses.

It’s possible to define more than one parameter within the same couple of slash (“/”). Such as:

server.get('/example/near/:lat-:lng/radius/:r', (req, res, next) => {}))

Remember in this case to use the dash (“-“) as parameters separator.

Finally it’s possible to have multiple parameters with RegExp.

server.get('/example/at/:hour(^\\d{2})h:minute(^\\d{2})m', (req, res, next) => {
  // req.params => { hour: 12, minute: 15 }

In this case as parameter separator it’s possible to use whatever character is not matched by the regular expression.

Having a route with multiple parameters may affect negatively the performance, so prefer single parameter approach whenever possible, especially on routes which are on the hot path of your application.

Fore more info see:

Remove already deprecated next.ifError

next.ifError(err) is not available anymore.

Disable DTrace probes by default

DTrace probes comes with some performance impact that’s fine for the sake of observability but you may don’t use it at all.

Change in calling next multiple times

Earlier restify automatically prevented calling the next() more than once. In the new version this behaviour is disabled by default, but you can activate it with the onceNext property.

The behaviour of the strictNext option is unchanged. Which means strictNext enforces onceNext option.

var server = restify.createServer({ onceNext: true })
server.use(function (req, req, next) {
// -> fine

var server = restify.createServer({ strictNext: true })
server.use(function (req, req, next) {
// -> throws an Error

Router versioning and content type

accept-version and accept based conditional routing moved to the conditionalHandler plugin, see docs or example:

var server = restify.createServer()

   contentType: 'application/json',
   version: '1.0.0'
   handler: function (req, res, next) {

server.get('/hello/:name', restify.plugins.conditionalHandler([
     version: '1.0.0',
     handler: function(req, res, next) { res.send('1.x') }
     version: ['1.5.0', '2.0.0'],
     handler: function(req, res, next) { res.send('1.5.x, 2.x') }
     version: '3.0.0',
     contentType: ['text/html', 'text/html']
     handler: function(req, res, next) { res.send('3.x, text') }
     version: '3.0.0',
     contentType: 'application/json'
     handler: function(req, res, next) { res.send('3.x, json') }

// 'accept-version': '^1.1.0' => 1.5.x, 2.x'
// 'accept-version': '3.x', accept: 'application/json' => '3.x, json'

After event fires when both request is flushed and last handler is finished

In 7.x after event fires after both request is flushed and last handler is finished.

Metrics plugin latency

In 7.x Metrics plugin’s latency is calculated when the request is fully flushed. Earlier it was calculated when the last handler finished.

To address the previous use-cases, new timings were added to the metrics plugin:

  • metrics.totalLatency both request is flushed and all handlers finished
  • metrics.preLatency pre handlers latency
  • metrics.useLatency use handlers latency
  • metrics.routeLatency route handlers latency

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