what's the difference between "proxy_cache" and "fastcgi_cache"?

[pig]

I know that "proxy_cache" is often used for static pages(or elements), and "fastcgi_cache" is usually used for dynamic script(*.php,*.jsp etc.).
  
      But what's difference between their implementation?   what content is cached by "fastcgi_cache", the script file itself or the interpretted HTML file?
  
      Thanks in advance.
  
  
 by piger
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