Merge f628c14 into 6d41472

index.js

@@ -12,13 +12,12 @@ const mergeResponse = (responseOrigin = {}, responseDestination = {}) => ({
   ...responseDestination
 })
 
-const createFetcher = method => async (url, opts = {}) => {
+const reachableUrl = async (url, opts = {}) => {
   const req = got(url, {
-    retry: 0,
     ...opts,
+    retry: 0,
     decompress: false,
-    responseType: 'buffer',
-    method
+    responseType: 'buffer'
   })
 
   const redirectStatusCodes = []
@@ -48,15 +47,8 @@ const createFetcher = method => async (url, opts = {}) => {
   }
 }
 
-const createRequest = fetch => (url, opts) => fetch(url, opts)
-
-const fromGET = createRequest(createFetcher('get'))
-
 const isReachable = ({ statusCode }) => statusCode >= 200 && statusCode < 400
 
-module.exports = async (url, opts = {}) => {
-  const { href: encodedUrl } = new URL(url)
-  return fromGET(encodedUrl, opts)
-}
+module.exports = async (url, opts) => reachableUrl(new URL(url).href, opts)
 
 module.exports.isReachable = isReachable

test/index.js

@@ -2,6 +2,7 @@
 
 const { URL } = require('url')
 const test = require('ava')
+const got = require('got')
 
 const reachableUrl = require('..')
 
@@ -17,6 +18,38 @@ test('resolve GET request', async t => {
   t.true(isReachable(res))
 })
 
+test('allow to cache', async t => {
+  const url = 'https://microlink.io/favicon.ico'
+  const cache = new Map()
+
+  await got.head(url, { throwHttpErrors: false })
+  await got(url, { throwHttpErrors: false })
+
+  t.is(cache.size, 0)
+
+  const responseOne = await reachableUrl(url, { cache })
+
+  t.is(responseOne.isFromCache, false)
+  t.is(cache.size, 1)
+
+  const responseTwo = await reachableUrl(url, { cache })
+
+  t.is(responseTwo.isFromCache, true)
+  t.is(cache.size, 1)
+})
+
+test('resolve as fast a HEAD', async t => {
+  const url = 'https://microlink.io/favicon.ico'
+
+  const headResponse = await got.head(url, { throwHttpErrors: false })
+  const headTime = headResponse.timings.phases.total
+
+  const getResponse = await reachableUrl(url)
+  const getTime = getResponse.timings.phases.total
+
+  t.true(getTime <= headTime * 2)
+})
+
 test('resolve prerender GET request', async t => {
   const url = 'https://www.instagram.com/teslamotors'
   const res = await reachableUrl(url)