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When I run a page through YSlow, using the Chrome extension, it gives the page an E grade for gzipping, suggesting 'Compress components with gzip', singling out four javascript files.

If I check these files' headers, they all show that they are gZipped:

Request Header: Accept-Encoding:gzip,deflate,sdch

Response Content-Encoding:gzip

What gives? Is it an error by YSlow?

Undistraction
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  • Sometimes people report that YSlow gives confusing results for resources that should already be gzip compressed. Do you have any public URLs that exhibit this problem? – BrianC Mar 08 '13 at 16:54
  • What platform are you running YSlow from? FF, C, O, S, bookmarklet, Node, PhantomJS? – marcelduran Mar 08 '13 at 17:08
  • @BrianC Sure. Holding page [here](http://missatomicbomb.com/). – Undistraction Mar 08 '13 at 19:00
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    I get an A grade for gzip on the holding page. – Colin 't Hart Mar 08 '13 at 19:26
  • @Colin'tHart Thanks for taking the time. What are you using out of interest? Chrome? Seems to be an issue with the Chrome extension. The Bookmarklet reports an 'A' also. I've had no luck getting the FF extension working. – Undistraction Mar 08 '13 at 19:47
  • Firefox, Firebug, YSlow. – Colin 't Hart Mar 09 '13 at 14:32
  • @Pedr, I'm getting the same results - on a Mac using YSlow in Chrome or Firefox it's showing the main doc and all css/js files as coming over gzip compressed. So does PageSpeed in Firefox/firebug. I also tried running the page through webpagetest.org and it too found compression working: http://www.webpagetest.org/result/130313_EK_3SV/. – BrianC Mar 13 '13 at 03:15
  • @BrianC Curiouser & curiouser. Thanks for checking. – Undistraction Mar 13 '13 at 11:16
  • possible duplicate of [PageSpeed site optimization trouble](http://stackoverflow.com/questions/18632081/pagespeed-site-optimization-trouble) – Paul Sweatte Sep 30 '14 at 01:26

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