- Table of contents
- Server-Side Includes
- Available Elements
- Expression Handling
- Flow Control
- Unsupported Features (Not Implemented)
- Quick and Dirty Notes from the 90s or How to enable https://de.wikipedia.org/wiki/SSI (Server Side Instruction)
SSI is a very old and cheap way to generate content dynamically on server-side.The use of this module is strongly discouraged:
- the execution of a SSI script is done in the server-core
- a long-running SSI script blocks the handling of ALL connections
- as soon as you use #exec the performance gets worse than using CGI scripts directly
- lighttpd mod_ssi does not fully implement numerous SSI directives, such as #include virtual="...", which only includes file contents, and not output from other handlers
- content assembling with #include for file inclusion only (not file execution via CGI or other handlers)
- legacy applications
mod_magnet is recommended as a more powerful alternative to mod_ssi simple page construction.
A separate backend script (run as CGI, FastCGI, SCGI, etc) is recommended for any CPU intensive or database-backed page construction.
You have to load the mod_ssi module and set the ssi.extension:
server.modules = ( ..., "mod_ssi", ... ) #Note that if you use mod_compress mod_ssi must come first to function.
List of file extensions that should be interpreted via mod_ssi.
ssi.extension = ( ".shtml" )
Content type of the pages being served via mod_ssi.
Default value: text/html
Enable/disable conditional request handling and generate ETag and Last-Modified response headers.
This should not be enabled unless the SSI requests are known to generate cacheable documents. An SSI page which only includes contents from other static files and/or which uses SSI commands that produce predictable output may be cacheable.
Default value: disable
Enable/disable #exec cmd="..." execution. (lighttpd mod_ssi does not implement #exec cgi="...")
Default value: enable
ssi.recursion-max (since 1.4.44)¶
Default value: 0 (disabled)
Set the max recursion depth for #include virtual="..." SSI processing. The default, 0, preserves the existing behavior of simply including the file.
<!--#echo var="..." --> <!--#echo var="DOCUMENT_ROOT"--> <!--#include file="..." --> <!--#include virtual="..." --> <!--#flastmod file="..." --> <!--#flastmod virtual="..." --> <!--#fsize file="..." --> <!--#fsize virtual="..." --> <!--#config timefmt="..." sizefmt="(bytes|abbrev)" --> <!--#printenv --> <!--#set var="..." value="..." --> <!--#if expr="..." --> <!--#elif expr="..." --> <!--#else --> <!--#endif --> <!--#exec cmd="..." --> <!--#exec cmd="date"-->
Expression Handling¶Every "expr" is interpreted:
- logical: &&, ||, !
- compare: ==, <, <=, >, =>, !=
- precedence: (, )
- quoted strings: 'string with a literal dollar: $FOO'
- variable substitution: $REMOTE_ADDR
- unquoted strings: string
if, elif, else and endif can only be used to insert content under special conditions.
Unsupported Features (Not Implemented)¶The original SSI module from NCSA and Apache provided some more options which are not supported by this module for various reasons:
Quick and Dirty Notes from the 90s or How to enable https://de.wikipedia.org/wiki/SSI (Server Side Instruction)¶
- You need to set the variable in lighttpd.conf `ssi.extension = (".html")`.
(Here we say that every `.html` file can have `<!--#include file="something"-->` or other SSI instructions. The filetype extension of the included file is not relevant!)
- Cheers to the 90s