[racket-dev] Downloading DrRacket for Mac is hard?

From: Guillaume Marceau (gmarceau at gmail.com)
Date: Thu Aug 11 13:16:24 EDT 2011

On Thu, Aug 11, 2011 at 3:25 AM, Eli Barzilay <eli at barzilay.org> wrote:
> On Aug 10, 2011, at 11:33 PM, Guillaume Marceau <gmarceau at gmail.com>
>> Does the combo box auto detect the
>> downloader's platform for the User-Agent header.
> Yes, in some cases when it's possible to make a guess.

I found this Stackoverflow article:


which says that the following code

deployJava.isWin64OS = function() {
   return navigator.userAgent.indexOf('WOW64')>-1 ||

will return one of these:

64 bit MacOS + 64 bit Safari or 32 bit Chrome:

32 bit windows + safari:

64 bit Windows + 64 bit IE:

64 bit Windows + 32 bit IE:

64 bit Windows + 32 Firefox (or Chrome):

32 bit linux mint (i686) + firefox:
window.navigator.platform=Linux i686

64 bit Ubuntu (x86_64) + 32 bit Chrome:
window.navigator.platform=Linux i686

64 bit Ubuntu + 64 bit Epiphany:
window.navigator.platform=Linux x86_64

In the ambiguous cases, you can get additional information by checking for
flash. Because Adobe doesn't support flash player on x64 browsers, if
detection is successful then it is definitely a 32 bit browser, if not, then
the request came from either a 32 bit browser without flash plugin or from a
64 bit browser.
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