Make parallel HEAD requests for an array of URLs and get back their HTTP status codes.

You've got a collection of URLs, and you want to make sure they're all working.

If you just need to check whether a URL is resolving, a HEAD request is preferable to a GET because it only downloads the response headers instead of the whole response body.

To keep things snappy, heads makes multiple requests in parallel instead of one at a time.

npm install heads --save

Heads expects an array of URL strings:

const heads = require("heads")
const urls = [
  'https://google.com',
  'https://github.com',
  'https://github.com/nonexistent-url'
]

heads(urls)
  .then(function(codes) {
   // [200, 200, 404]
   codes.every(code => code === 200)
  })
  .catch(function(err) {
    // handle error
  })

Node-style callbacks are supported too:

heads(urls, function(err, codes) { /*...*/ })

If you just need to look up one URL, pass it as an argument instead of an array:

heads('http://mysite.com').then(...)

npm install
npm test

• async: Higher-order functions and common patterns for asynchronous code
• got: Simplified HTTP requests
• pify: Promisify a callback-style function

• tap-spec: Formatted TAP output like Mocha's spec reporter
• tape: tap-producing test harness for node and browsers

MIT

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