title: Vue-resource headers are not passed
body: <p>I'm trying to send a simple POST request through vue-resource. It requires a specifi header, which I'm passing though the headers option, but i'm still getting a 401 error, with a missing header response.</p>
  
  <p>I followed every step for the vue-resource configuration, here is the post request</p>
  
  <pre><code>&lt;script&gt;
  export default {
    data () {
      return {
        quote: ''
      }
    },
    methods: {
      getQuote () {
        this.$http
          .post('https://andruxnet-random-famous-quotes.p.mashape.com/?cat=movies',
          {},
          {
            headers: {
              'X-Mashape-Key': 'x1TtXXYZYemshmluWEEZ3mqnx78yp1RtL6gjsnoxDbxhy4TBoT',
              'Content-Type': 'application/x-www-form-urlencoded',
              'Accept': 'application/json'
            }
          })
        .then(function (result) {
          console.log(result.body.quote)
          this.quote = result.body.quote
          this.author = result.body.author
        })
      }
    }
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>Did I miss anything ?</p>