Validate headers value (#73)

Validate headers value

lib/request.js

@@ -5,6 +5,7 @@
 const { Readable } = require('readable-stream')
 const util = require('util')
 const cookie = require('cookie')
+const assert = require('assert')
 
 const parseURL = require('./parseURL')
 
@@ -46,7 +47,9 @@ function Request (options) {
   this.headers = {}
   const headers = options.headers || {}
   Object.keys(headers).forEach((field) => {
-    this.headers[field.toLowerCase()] = headers[field]
+    const value = headers[field]
+    assert(value !== undefined, 'invalid value "undefined" for header ' + field)
+    this.headers[field.toLowerCase()] = '' + value
   })
 
   this.headers['user-agent'] = this.headers['user-agent'] || 'lightMyRequest'

test/test.js

@@ -1430,3 +1430,50 @@ test('read cookie', (t) => {
     ])
   })
 })
+
+test('correctly handles no string headers', (t) => {
+  t.plan(2)
+  const dispatch = function (req, res) {
+    res.writeHead(200, { 'Content-Type': 'application/json' })
+    res.end(JSON.stringify(req.headers))
+  }
+
+  const date = new Date(0)
+  const headers = {
+    integer: 12,
+    float: 3.14,
+    null: null,
+    string: 'string',
+    object: { foo: 'bar' },
+    array: [1, 'two', 3],
+    date,
+    true: true,
+    false: false
+  }
+
+  inject(dispatch, { method: 'GET', url: 'http://example.com:8080/hello', headers }, (err, res) => {
+    t.error(err)
+    t.deepEqual(JSON.parse(res.payload), {
+      integer: '12',
+      float: '3.14',
+      null: 'null',
+      string: 'string',
+      object: '[object Object]',
+      array: '1,two,3',
+      date: date.toString(),
+      true: 'true',
+      false: 'false',
+      host: 'example.com:8080',
+      'user-agent': 'lightMyRequest'
+    })
+  })
+})
+
+test('errors for invalid undefined header value', (t) => {
+  t.plan(1)
+  try {
+    inject((req, res) => {}, { url: '/', headers: { 'header-key': undefined } }, () => {})
+  } catch (err) {
+    t.ok(err)
+  }
+})