jquery-1.12.4.min.js on CDN is not compressed

[EvaLok]

was working on an older site and updated it to load jQuery 1.12.4 via CDN, but pagespeed dev insights says it isn't compressed. i then reviewed response headers and that does appear to be the case. screenshots below:

[mgol]

@Krinkle any ideas? Didn't we clear the cache at one point?

[timmywil]

Looks okay on my machine.

I can't see from the photo, but make sure the Accept-Encoding header is in the request.

[EvaLok]

for anyone else experiencing this, i was able to resolve the issue by using Google's CDN instead:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> 

[mgol]

@timmywil I see the same issue on my side. I. checked 2.2.4 & 3.7.1 as well and none were compressed. Accept-Encoding: gzip, deflate, br is present in the request headers so the issue is not on my side.

[mgol]

A previous similar issue: #98

[mgol]

From my investigation with Timmy, it looks like advertising Brotli support (which all browsers have done for a long time) is tripping the logic:

$ curl https://code.jquery.com/jquery-3.7.1.min.js --silent --write-out "%{size_download}\n" --output /dev/null 
87533
$ curl https://code.jquery.com/jquery-3.7.1.min.js --silent -H "Accept-Encoding: gzip, deflate" --write-out "%{size_download}\n" --output /dev/null 
30336
$ curl https://code.jquery.com/jquery-3.7.1.min.js --silent -H "Accept-Encoding: gzip, deflate, br" --write-out "%{size_download}\n" --output /dev/null 
87533

[timmywil]

It seems to be more complicated than that, but we have a possible solution.

[timmywil]

This seems to be fixed now. Thanks for the report! We are purging some of the most popular URLs individually so they update quickly, but any ones we miss will update eventually.

[EvaLok]

i'm not sure if it's worth the time investment or not, but you could set up an automated test to ensure that resources are properly compressed in the future. i may or may not be able to help with that depending on your tech preferences as far as the tests.

[Krinkle]

We have a smoke test in the https://github.com/jquery/infrastructure-puppet repository, which includes tests for Code/Codeorigin.

[EvaLok]

i see - so if i'm understanding correctly, would it be possible to add a test for the presence of compression there? and would it perhaps be worth checking (at a minimum) the most recent versions of jQuery 1,2,3?

https://github.com/jquery/infrastructure-puppet/blob/517510f875be4617792e4ff934437c626a70740a/test/CodeoriginTest.php#L28-L39

[Krinkle]

@EvaLok That's right!

We might not need to test multiple versions since all our handling is file agnostic, but one test with gzip compression for one JS file (e.g. the minified JS file of a jQuery 3.x version), and one for a CSS file (e.g. the minified stylesheet of a jQuery UI theme), would be very useful!