Built in Apache server in Mac OS X

Mac OS X has built-in Apache Web server which can be very useful to quickly test web app.

The Apache configuration file is:
/etc/apache2/httpd.conf
Listen 80
DocumentRoot "/Library/WebServer/Documents"
ErrorLog "/private/var/log/apache2/error_log"

Commands to start/stop Apache server
sudo apachectl start
sudo apachectl stop
sudo apachectl restart

Copy some website for testing
sudo cp -r example-multipage-shim-master/www-built/ /Library/WebServer/Documents/test

Then access testing page using localhost and port 80
http://localhost/test/page1.html

IE user agent

"Windows NT 6.2" indicates the browser is on a computer running Windows 8, whereas "Windows NT 6.1" indicates the computer is running Windows 7.

32-bit Internet Explorer 10 on 32-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)

32-bit Internet Explorer 10 on 64-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)

64-bit Internet Explorer 10 on 64-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)

Internet Explorer 10 on Windows RT:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; ARM; Trident/6.0)

If this token is present at the end of the UA string, the computer has touch capability, and is running Windows 8 (or later)
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0; Touch)

In Javascript, we use below to detect it is 64-bit IE on 64-bit windows. It should be an acceptable solution.
navigator.userAgent.indexOf("Win64") != -1 && navigator.userAgent.indexOf("x64") != -1

Btw, IE11 doesn't use MSIE anymore, we need look for Trident/7.0 rv11 from user agent. With regarding to complicate user agent string detect logic, it might be better to detect using browser supported features.

requirejs throws cannot find module [component/selector/abc] error

The file was there, but requirejs kept saying cannot find module
then I did a http request test to directly point to the javascript file and found it was 403 error permission. It turned out requirejs cannot access the file due to file permission issue.

The solution is to chmod or (On OS X) right click the file and 'Get Info' to change Everyone to READ in "Sharing and permissions" section.