CloudFront

CloudFront behaviour, functions, performance testing and Anycast IP.

CloudFront Anycast IP

9 October, 2025 2 min read 336 words
AWS charges $3,000 a month for CloudFront Anycast IP. Testing shows it is a small static IP set, not anycast in any meaningful sense.

CloudFront Functions with Dynamic Origin Pointing to Another CloudFront

5 February, 2025 1 min read 91 words
Using CloudFront Functions to dynamically change the origin to another CloudFront distribution via updateRequestOrigin.

Curl net performance test

15 December, 2016 1 min read 141 words
Curl scripts that log the CloudFront X-Amz-Cf-Id whenever a response is slower than a threshold, plus a full connection timing breakdown.