Issue with CloudFront-Viewer-City Header

From RFC 8187, we see non US-ASCII values require encoding.

By default, header field values in Hypertext Transfer Protocol (HTTP) messages cannot easily carry characters outside the US-ASCII coded character set. [...] This document specifies an encoding suitable for use in HTTP header fields that is compatible with a simplified profile of the encoding defined in RFC 2231.

Patiāla was UTF-8 character encoded, and then percent-encoded to be Pati%C4%81la

Here is a JavaScript example on how to decode that value:

console.log(decodeURIComponent('Pati%C4%81la'))