Add some server tests

server.js

@@ -1,5 +1,6 @@
+const http = require('http')
 const throng = require('throng')
-const createServer = require('./server/createServer')
+const createApp = require('./server/createApp')
 
 const port = parseInt(process.env.PORT, 10) || 5000
 
@@ -8,7 +9,24 @@ throng({
   lifetime: Infinity,
   grace: 25000,
   start: function (id) {
-    const server = createServer()
+    const server = http.createServer(createApp())
+
+    // Heroku dynos automatically timeout after 30s. Set our
+    // own timeout here to force sockets to close before that.
+    // https://devcenter.heroku.com/articles/request-timeout
+    server.setTimeout(25000, function (socket) {
+      const message = `Timeout of 25 seconds exceeded`
+
+      socket.end([
+        `HTTP/1.1 503 Service Unavailable`,
+        `Date: ${(new Date).toGMTString()}`,
+        `Content-Type: text/plain`,
+        `Content-Length: ${Buffer.byteLength(message)}`,
+        `Connection: close`,
+        ``,
+        message
+      ].join(`\r\n`))
+    })
 
     server.listen(port, function () {
       console.log('Server #%s listening on port %s, Ctrl+C to stop', id, port)