5-configure-cloudfront.md

Configure Amazon Cloud Front

Why Using CloudFront

** Amazon API Gateway only accepts HTTPS, while Arduino could only send HTTP request.** Here is a related StackOverflow Question.

How

• Go to Amazon CloudFront and create a distribution.
• Most fields just leave them as default, the highlighted fields inside red rectangular in the following screenshots are ones needs configurations:
  • 1xxxx is the placeholder for the unique identifier of your "Invoke URL" in your API deployed
  • Default TTL should be set to 0, time-to-live is used for Content Delivery Network (CDN) set up in Amazon CloudFront service: meaning usually your content, mostly for website assets like JavaScript, CSS files, will be cached when you first visit a certain URL. And the next time you visit the same URL, the CloudFront service will serve you directly with the cached/last version of the response, even if the response should have been different. Only after the TTL time outs, will the cached contents be updated. That's why under our real-time update requirement, a TTL of 0 is necessary.
  • query string forwarding should be enabled, so that when your Arduino visit cloudfront proxy URL with paramters in query string, the Web Server Lambda will still ultimately received them.
• The deployment takes quite some time, most likely ~ 10 minutes or so, because Amazon will update all of its DNS server to direct the traffic, once deployed you could go ahead to testing.

Testing

Instead of calling Amazon API Gateway URL, call your cloudfont domain of the format: d1xxxxx.cloudfront.net/puzzle?action=arduinoPull, you should get something similar: