Note: This blog post was originally written before the new Chromium-based Microsoft Edge was announced. As a consequence, it includes discussion of the behavior of the Legacy Microsoft Edge browser. The new Chromium-based Edge behaves largely the same way as Google Chrome. Last Update: 31 Mar 2023. InPrivate Mode was introduced in Internet Explorer 8Continue reading “Private Browsing Mode”
Tag Archives: cache
CORS and Vary
Yesterday, I started looking a site compatibility bug where a page’s layout is intermittently busted. Popping open the F12 Tools on the failing page, we see that a stylesheet is getting blocked because it lacks a CORS Access-Control-Allow-Origin response header: We see that the client demands the header because the LINK element that references itContinue reading “CORS and Vary”
On Daylight Savings Time
In Fiddler, the Caching tab will attempt to calculate the cache freshness lifetime for responses that lack an explicit Expires or Cache-Control: max-age directive. The standard suggests clients use (0.1 * (DateTime.Now – Last-Modified)) as a heuristic freshness lifetime. An alert Fiddler user noticed that the values he was seeing were slightly off what he expected: sometimes the valuesContinue reading “On Daylight Savings Time”
HTTP Caching Public Service Announcement
There are many interesting thing to say about HTTP caching. I’ve blogged about them a lot in the past. Today’s public service announcement to clear up two extremely common misconceptions: 1. The no-cache directive does not mean “do not cache” (even though IE versions prior to IE10 implemented it that way). What it really meansContinue reading “HTTP Caching Public Service Announcement”
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