The Apache Environment variable, HTTP_REFERER
is used above to show you the full URL of the page
that brought you here. In the example above, Extended
SSI (XSSI) logic was used to see if there was a value
in the HTTP_REFERER variable. This allows you to handle
situations such as bookmarks or browsers that do not
report a value for the HTTP_REFERER. Let's look at the
source code:
<!--#if expr="${HTTP_REFERER} =/http/" -->
<B>You came from <!--#echo var="HTTP_REFERER"--></B>
<!--#else -->
<B>I don't know where you came from</B>
<!--#endif -->
I don't have XSSI, Can I still have a back button?
Of course. With any SSI compatible server you can simply do this:
<A HREF="<!--#echo var="HTTP_REFERER"-->">BACK</A>
clipped from: bignosebird.com