Server Side Includes (SSI) is a technique that allows HTML documents to be dynamically generated on the server side. SSI uses special commands embedded within HTML comments, which are interpreted and executed by the web server before the page is sent to the user's browser.
Functions and Applications of SSI:
Including Content: SSI allows content from other files or dynamic sources to be inserted into an HTML page. For example, you can reuse a header or footer across multiple pages by placing it in a separate file and including that file with SSI.
<!--#include file="header.html"-->
Executing Server Commands: With SSI, server commands can be executed to generate dynamic content. For example, you can display the current date and time.
<!--#echo var="DATE_LOCAL"-->
Environment Variables: SSI can display environment variables that contain information about the server, the request, or the user.
<!--#echo var="REMOTE_ADDR"-->
Conditional Statements: SSI supports conditional statements that allow content to be shown or hidden based on certain conditions.
<!--#if expr="$REMOTE_ADDR = "127.0.0.1" -->
Welcome, local user!
<!--#else -->
Welcome, remote user!
<!--#endif -->Advantages of SSI:
Disadvantages of SSI:
SSI is a useful technique for creating and managing websites, especially when it comes to integrating reusable and dynamic content easily. However, its use should be carefully planned and implemented to avoid performance and security issues.
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