Python Web CGI Programming Start

To get everything working for your App.py on web, you need
1. Make sure your Web server has register handler for Py file as cgi-script file, mostly likely hosting provide that support python already add that handler, but for local test like xampp, make sure Apache config setting has .py included like this
```
AddHandler cgi-script .cgi .pl .asp .py
```
2. add your server python version path to first line of App.py,
  1. linux example:
```
#!/usr/bin/python
```
  2. windows example:
```
#!C:/Python27/python
```
3. put your App.py in cgi-bin folder in your web host or other place
4. after upload, change file permission to 755

start ref:
- https://wiki.python.org/moin/CgiScripts
- php call python subprocess way vs CGI way:
  - https://stackoverflow.com/questions/14047979/executing-python-script-in-php-and-exchanging-data-between-the-two

Web System Optimize

https://developer.yahoo.com/performance/rules.html