diff --git a/api/services/cratesio.js b/api/services/cratesio.js
index c1296a9..ad09632 100644
--- a/api/services/cratesio.js
+++ b/api/services/cratesio.js
@@ -1,11 +1,5 @@
 const fetch = require('isomorphic-unfetch')
-
-async function getAvailability(name) {
-  const response = await fetch(
-    `https://crates.io/api/v1/crates/${encodeURIComponent(name)}`
-  )
-  return response.status !== 200
-}
+const { send, sendError } = require('../util/http')
 
 module.exports = async (req, res) => {
   const name = req.query.name
@@ -15,9 +9,12 @@ module.exports = async (req, res) => {
   }
 
   try {
-    const availability = await getAvailability(name)
-    res.json({ availability })
+    const response = await fetch(
+      `https://crates.io/api/v1/crates/${encodeURIComponent(name)}`
+    )
+    const availability = response.status !== 200
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/dns.js b/api/services/dns.js
index aee43bd..595cb90 100644
--- a/api/services/dns.js
+++ b/api/services/dns.js
@@ -1,4 +1,5 @@
 var dns = require('dns')
+const { send, sendError } = require('../util/http')
 
 function resolvePromise(hostname) {
   return new Promise((resolve, reject) => {
@@ -19,12 +20,11 @@ module.exports = async (req, res) => {
   try {
     const response = await resolvePromise(name)
     const availability = response && response.length > 0 ? false : true
-
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
     if (err.code === 'ENODATA' || err.code === 'ENOTFOUND') {
       return res.status(200).json({ availability: true })
     }
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/domain.js b/api/services/domain.js
index 4497093..aba8f2c 100644
--- a/api/services/domain.js
+++ b/api/services/domain.js
@@ -1,4 +1,5 @@
 import whois from 'whois-json'
+const { send, sendError } = require('../util/http')
 
 module.exports = async (req, res) => {
   const name = req.query.name
@@ -10,9 +11,8 @@ module.exports = async (req, res) => {
   try {
     const response = await whois(name, { follow: 3, verbose: true })
     const availability = response[0].data.domainName ? false : true
-
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/github.js b/api/services/github.js
index 6b314b6..d8ac9ab 100644
--- a/api/services/github.js
+++ b/api/services/github.js
@@ -1,4 +1,5 @@
 const fetch = require('isomorphic-unfetch')
+const { send, sendError } = require('../util/http')
 
 async function getAvailability(name) {
   const response = await fetch(`https://github.com/${encodeURIComponent(name)}`)
@@ -14,8 +15,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await getAvailability(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/npm-org.js b/api/services/npm-org.js
index 6a85958..230419d 100644
--- a/api/services/npm-org.js
+++ b/api/services/npm-org.js
@@ -1,4 +1,5 @@
 const npmName = require('npm-name')
+const { send, sendError } = require('../util/http')
 
 module.exports = async (req, res) => {
   const name = req.query.name
@@ -9,8 +10,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await npmName(`@${name}`)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/npm.js b/api/services/npm.js
index f50e6e6..1436861 100644
--- a/api/services/npm.js
+++ b/api/services/npm.js
@@ -1,4 +1,5 @@
 const npmName = require('npm-name')
+const { send, sendError } = require('../util/http')
 
 module.exports = async (req, res) => {
   const name = req.query.name
@@ -9,8 +10,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await npmName(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/pypi.js b/api/services/pypi.js
index 3fb5666..a074969 100644
--- a/api/services/pypi.js
+++ b/api/services/pypi.js
@@ -1,4 +1,5 @@
 const fetch = require('isomorphic-unfetch')
+const { send, sendError } = require('../util/http')
 
 async function getAvailability(name) {
   const response = await fetch(
@@ -16,8 +17,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await getAvailability(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/s3.js b/api/services/s3.js
index 5db8534..e9a070e 100644
--- a/api/services/s3.js
+++ b/api/services/s3.js
@@ -1,4 +1,5 @@
 const fetch = require('isomorphic-unfetch')
+const { send, sendError } = require('../util/http')
 
 async function getAvailability(name) {
   const response = await fetch(
@@ -16,8 +17,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await getAvailability(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/slack.js b/api/services/slack.js
index cb23e31..01e57e1 100644
--- a/api/services/slack.js
+++ b/api/services/slack.js
@@ -1,4 +1,5 @@
 const fetch = require('isomorphic-unfetch')
+const { send, sendError } = require('../util/http')
 
 async function getAvailability(name) {
   try {
@@ -24,8 +25,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await getAvailability(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/services/twitter.js b/api/services/twitter.js
index 60b6888..d57257a 100644
--- a/api/services/twitter.js
+++ b/api/services/twitter.js
@@ -1,4 +1,5 @@
 const fetch = require('isomorphic-unfetch')
+const { send, sendError } = require('../util/http')
 
 async function getAvailability(name) {
   const response = await fetch(
@@ -16,8 +17,8 @@ module.exports = async (req, res) => {
 
   try {
     const availability = await getAvailability(name)
-    res.json({ availability })
+    send(res, availability)
   } catch (err) {
-    res.status(400).json({ error: err.message })
+    sendError(res, err)
   }
 }
diff --git a/api/util/http.js b/api/util/http.js
new file mode 100644
index 0000000..cd14bc9
--- /dev/null
+++ b/api/util/http.js
@@ -0,0 +1,8 @@
+exports.send = (res, availability) => {
+  res.setHeader('Cache-Control', 'maxage=0, s-maxage=3600')
+  res.json({ availability })
+}
+
+exports.sendError = (res, error) => {
+  res.status(400).json({ error: error.message })
+}
diff --git a/now.json b/now.json
index 5792d65..ab8a719 100644
--- a/now.json
+++ b/now.json
@@ -16,10 +16,7 @@
   "routes": [
     {
       "src": "/availability/(?<provider>[^/]+)/(?<id>[^/]+)",
-      "dest": "/api/services/$provider.js?name=$id",
-      "headers": {
-        "Cache-Control": "maxage=0, s-maxage=3600"
-      }
+      "dest": "/api/services/$provider.js?name=$id"
     },
     {
       "src": "/(.*)",