Adding "br" on Accept-Encoding modifies the minified polyfill

Sorry for the lack of details on this issue, I didn’t have time to narrow down the cause, but I think the example are clarifying.

Request with Accept-Encoding: gzip, br

curl --location --request GET 'https://cdn.polyfill.io/v3/polyfill.min.js?features=Object.values,Object.entries,Object.assign,Array.from,Array.prototype.findIndex,Array.prototype.fill,Array.prototype.find,Array.prototype.includes,String.prototype.startsWith,String.prototype.endsWith,String.prototype.includes,Symbol,fetch,Promise,Map,WeakMap,Number.isInteger,Number.isNaN,Set,Function.name,URL,IntersectionObserver,Intl.~locale.en-GB&flags=gated' \
--header 'User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.1 Mobile/15E148 Safari/604.1' \
--header 'Accept-Encoding: gzip, br'

Results: the Intl polyfill is not included.

Request with Accept-Encoding: gzip

curl --location --request GET 'https://cdn.polyfill.io/v3/polyfill.min.js?features=Object.values,Object.entries,Object.assign,Array.from,Array.prototype.findIndex,Array.prototype.fill,Array.prototype.find,Array.prototype.includes,String.prototype.startsWith,String.prototype.endsWith,String.prototype.includes,Symbol,fetch,Promise,Map,WeakMap,Number.isInteger,Number.isNaN,Set,Function.name,URL,IntersectionObserver,Intl.~locale.en-GB&flags=gated' \
--header 'User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.1 Mobile/15E148 Safari/604.1' \
--header 'Accept-Encoding: gzip'

Results: the Intl polyfill is included:

Other points

• If I ask only for Intl on the parameters, both cases come with the requested Polyfill, so that’s why I couldn’t narrow down what also impacts this.
• If I ask for the asset not minified, on both cases the Intl comes, so I was wondering there might be something related with caching.

[JakeChampion]

@lucis thanks for the issue. This was a caching issue and has been fixed now, I’ve tried all the curl requests in this issue’s comments and they are all returning the expected polyfills now 👍

curl --location --request GET 'https://cdn.polyfill.io/v3/polyfill.min.js?features=Object.values,Object.entries,Object.assign,Array.from,Array.prototype.findIndex,Array.prototype.fill,Array.prototype.find,Array.prototype.includes,String.prototype.startsWith,String.prototype.endsWith,String.prototype.includes,Symbol,fetch,Promise,Map,WeakMap,Number.isInteger,Number.isNaN,Set,Function.name,URL,IntersectionObserver,Intl.~locale.en-GB&flags=gated' \
--header 'User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.1 Mobile/15E148 Safari/604.1' \
--header 'Accept-Encoding: gzip, br' | brotli --decompress

that returns Intl ☝️

curl --location --request GET 'https://polyfill.io/v3/polyfill.min.js?features=ResizeObserver' \ --header 'User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 12_4_8 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1.2 Mobile/15E148 Safari/604.1' --header 'Accept-Encoding: gzip, br' | brotli --decompress

that returns ResizeObserver

The ie11 reqeuests return the same polyfills regardless of the compression used:

[[ `curl --location --request GET 'https://polyfill.io/v3/polyfill.min.js?features=ResizeObserver' \ --header 'User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko' --header 'Accept-Encoding: gzip' --compressed` == `curl --location --request GET 'https://polyfill.io/v3/polyfill.min.js?features=ResizeObserver' \ --header 'User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko'` ]] && echo "Equal" || echo "Not equal"

Equal

[JakeChampion]

Let’s close this since nothing else is needed to be done 👍