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Caution
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If you plan to disable execution of external programs via SSI commands, you can use the IncludesNOEXEC option with the Options directive This disables execution of external programs However, it also disables loading of external files via the SSI command Include
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Using XBitHack for htm or html files
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As mentioned before, enabling SSI parsing for the entire directory degrades server performance You should try hard to avoid using the html or htm extensions for SSI; if you must use them, then use the XbitHack directive found in the mod_include module The XBitHack directive controls server parsing of files associated with the MIME-type text/html: Syntax: XBitHack On | Off | Full Default: XBitHack Off Context: Server config, virtual host, directory, per-directory access control file (htaccess) Override: Options Typically, only html and htm files are associated with text/html The default value off tells the server not to parse these files When this is set to on, any HTML file that has execute permission for the file owner is considered an SSI file and is parsed When the directive is set to full, it makes the server check the owner and the group executable bits of the file permission settings If the group executable bit is set, then Apache sets the last-modified date of the returned file to be the last modified time of the file If it is not set, then no last-modified date is sent Setting this bit enables clients and proxies to cache the result of the request Use of the value full is not advisable for SSI pages that produce a different output when parsed and processed
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You will still have to use Options directive to enable SSI support
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+Includes when using the XBitHack
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If you use per-directory access control file (htaccess) to enable SSI support, make sure that the AllowOverride directive for the site owning that directory allows such an operation The AllowOverride directive for such a site must allow the Includes option to be overridden For example, if the AllowOverride is set to None for a site, no SSI parsing will occur
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If you do not use the + sign in the Options line in the preceding example, all the options except Includes are disabled
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Now that you know how to enable SSI support in Apache, the next section discusses the SSI commands in detail
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SSI commands are embedded in HTML pages in the form of comments The base command structure looks like this:
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<!--#command argument1=value argument2=value argument3=value -->
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The value is often enclosed in double quotes; many commands only allow a single attribute-value pair Note that the comment terminator --> should be preceded by white space to ensure that it isn t considered part of the SSI command The following sections examine all the available SSI commands
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The config command enables you to configure the parse error message that appear, as well as the formatting that is used for displaying time and file size information This is accomplished with the following lines of code:
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config errmsg= error message config sizefmt=[ bytes | abbrev ] config timefmt=format string config errmsg= error message shows you how to create a custom error message, which is displayed when a parsing error occurs For example, Listing 13-1 shows a file called config_errmsgshtml
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Listing 13-1: config_errmsgshtml
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<HTML> <BODY> <TITLE> Apache Server 2 - 13 </TITLE> </HEAD> <BODY BGCOLOR= white > <FONT SIZE=+1 FACE= Arial > Simple SSI Example #1</FONT> <HR SIZE=1> <P> Example of the SSI <STRONG>config errmsg</STRONG> command: </P> <P> Embedded commands: <BR><BR> <CODE> <!-#config errmsg= SSI error! Please notify the webmaster -> <BR> <!-#config badcommand= whatever ->
13 Server Side Includes (SSI)
</CODE> </P> <P> Result: <BR> <!--#config errmsg= SSI error! Please notify the Web master -> <BR> <!--#config badcommand= whatever --> </P> </BODY> </HTML>
In this example file, there are two SSI commands: