Server-Side Include

• Allows an HTML page to include files from the server
• Allows an HTML page to execute programs and insert the results.

<!--#include virtual="/footer.html"-->

<!--#include virtual="/cgi-bin/counter.cgi"-->

• Can either use a relative path (relative to the current directory), or an absolute path (starting with "/")
• Full URLs (http://...) aren't supported, even if the file is on the same server

• Can't have an SSI in HTML code that's dynamically generated by JavaScript, because the JavaScript is run on the client side.
  

SHTML

• Server-side-include HyperText Markup Language
• .shtml is the file extension for web pages that contain server side includes (SSI).
• The server has to be configured to support SSI.

Server-Side Include elements

<!--#element [attribute="value"]+-->

Attributes supported by Apache and IIS

• config
• echo
• exec
• fsize
• flastmod: When a file was last modified
  
• include

Attributes supported by Apache

• printenv
• set