Hmm, incorrect date? Date on the servers and the load balancers seem to be OK and NTP synced; what do you mean exactly? (And it's a little weird this only...
The HTTP spec states that the Date response header "represents the date and time at which the message was originated." It's currently Dec 4 (GMT), but some of...
Steve, I'm reading your book and it says that Cache-Control was introduced in HTTP/1.1 to be an alternative to Expires. In the tool I have some warning for...
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21 says: If a response includes a Cache-Control field with the max-age directive, that directive...
Hi guys, The new YSlow is out. The highlights: * It crawls frames (recursively) to get and examine components, this means all components in frames/iframes are...
Congrats on the new release! YSlow has indeed become an indispensable part of web development. I have a question regarding the score calculation for CSS...
Hi Rakesh, Thanks for your kind words! Including stylesheets with @import has the same effect as adding them in a <link /> towards the end. Those get...
Thanks for the clarification. So this numbers would just affect our development mode. - Rakesh ... Thanks for the clarification. So this numbers would just...
With the new release of YSlow 0.9.0, it's possible for YSlow to find HTTP requests that are not attached to any DOM elements. In this situation, YSlow...
Hi Performancers! Hope you're doing well with your site's tunning, I'm testing some code I've build based on Steve's tips, and I want to try a real CDN besides...
Hi Steve, Thanks for the suggestion, I'll check out their site. After playing with it, I'll study how geographical locationed CND content serving works. I'm on...
Hi, Titus. Those are redirects. This is a bug in YSlow 0.9 that we'll fix now. When doing Stats it's mistakenly calling redirects "undefined". Thanks. -Steve...
Hmmm, well maybe I'm being dense, but it seems that regardless of Date header, some things are showing up right in the and others not YSlow Net panel largely...
Hi folks! Thanks for the excellent Yslow - its simply rocks. With my latest yslow upgrade, I noticed that slowness hit the fan. Yslow seems to try and load a...
Hey all, I've got a question regarding gzipping the components of your web pages. I'm new to this group and see most of the posts here relate to the excellent...
We actully pipe js/css via PHP, and use this to decide if use gzip, this includes a few exceptions we found on the net somewhere (will try to dig out the...
Hello all, I have updated YSlow today to 0.9.2 (previous version was 0.8). After this, the following error message started to appear in firebug on almost every...
Thanks for your reply, Barry. How would/could this have an impact on using a CDN? Can eg. Akamai cache several objects per url (i.e. js/css-file) (with...
Our site is a little smaller (800m on a good month), but we've experienced the same problems (also with XML, not just CSS and JS). What we've done is not to...
Ah the reference was in the function comment! http://rakaz.nl/item/make_your_pages_load_faster_by_combining_and_compressing_javascript_and_css_files I've never...
Chapter 4 of High Performance Web Sites goes over this issue at great length. On page 34 it mentions using "Vary: Content-Encoding,User-Agent". However,...
Interesting; we compress all CSS/JS/PDF/text/Office files with an exception for Netscape 4.7 and haven't heard of any issues with it (via our Netscaler ...
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