This runs a basic set of ASCII chars through standard url encode functions in Java and Fastly VCL.
Corresponding Fastly VCL Fiddle: https://fiddle.fastly.dev/fiddle/82e91fbd
Java encoded output:
%09+%21%22%23%24%25%26%27%28%29*%2B%2C-.%2F0123456789%3A%3B%3C%3D%3E%3F%40ABCDEFGHIJKLMNOPQRSTUVWXYZ%5B%5C%5D%5E_%60abcdefghijklmnopqrstuvwxyz%7B%7C%7D%7EDEL%E2%82%AC%E2%80%9A%C6%92%E2%80%9E%E2%80%A6%E2%80%A0%E2%80%A1%CB%86%E2%80%B0%C5%A0%E2%80%B9%C5%92%C5%BD%E2%80%98%E2%80%99%E2%80%9C%E2%80%9D%E2%80%A2%E2%80%93%E2%80%94%CB%9C%E2%84%A2%C5%A1%E2%80%BA%C5%93%C5%BE%C5%B8%C2%A1%C2%A2%C2%A3%C2%A4%C2%A5%C2%A6%C2%A7%C2%A8%C2%A9%C2%AA%C2%AB%C2%ACSHY%C2%AE%C2%AF%C2%B0%C2%B1%C2%B2%C2%B3%C2%B4%C2%B5%C2%B6%C2%B7%C2%B8%C2%B9%C2%BA%C2%BB%C2%BC%C2%BD%C2%BE%C2%BF%C3%80%C3%81%C3%82%C3%83%C3%84%C3%85%C3%86%C3%87%C3%88%C3%89%C3%8A%C3%8B%C3%8C%C3%8D%C3%8E%C3%8F%C3%90%C3%91%C3%92%C3%93%C3%94%C3%95%C3%96%C3%97%C3%98%C3%99%C3%9A%C3%9B%C3%9C%C3%9D%C3%9E%C3%9F%C3%A0%C3%A1%C3%A2%C3%A3%C3%A4%C3%A5%C3%A6%C3%A7%C3%A8%C3%A9%C3%AA%C3%AB%C3%