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

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>
wrote:
>> 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:


http://stackoverflow.com/questions/1741933/detect-64-bit-or-32-bit-windows-from-user-agent-or-javascript

which says that the following code

deployJava.isWin64OS = function() {
   return navigator.userAgent.indexOf('WOW64')>-1 ||
window.navigator.platform=='Win64';
};


will return one of these:

64 bit MacOS + 64 bit Safari or 32 bit Chrome:
window.navigator.platform=MacIntel

32 bit windows + safari:
window.navigator.platform=Win32

64 bit Windows + 64 bit IE:
window.navigator.platform=Win64
window.navigator.cpuClass=x64

64 bit Windows + 32 bit IE:
window.navigator.platform=Win32
window.navigator.cpuClass=x86

64 bit Windows + 32 Firefox (or Chrome):
window.navigator.platform=Win32

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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