I'm trying to migrate a website that worked under 2.2. The only change required 
seems to be in SSI, because the syntax changed from 2.2 to 2.4. I decided not 
to use the "SSILegacyExprParser on" option because that option might go away in 
the future.

The site has a .shtml file that contained:
<!--#if expr="${ismember}" -->

The first attempt at conversion was to replace this by:
<!--#if expr="%{ismember}" -->

That doesn't work, it displays:
[an error occurred while processing this directive]
on the webpage, and in apache2's error.log file there appears:

 [include:error] [pid 3616] [client 127.0.0.1:39677] AH01337: Could not parse 
expr "%{ismember}" in [...]: syntax error, unexpected $end: Variable 'ismember' 
does not exist

(I've replaced the file path by [...]).
Next, I added the following to the file before the <!--#if :

<!--#set var="ismember" value="something" -->
<!--#echo var="ismember" -->

and tried again.
This time, the line:
something
appeared on the web page. This confirms that SSI is correctly set up and that 
apache is processing SSI directives in the file.
Yet otherwise the symptoms are the same. Apache still complains in the 
error.log file that the variable 'ismember' does not exist, despite having just 
successfully echoed its value to the webpage!

Can anyone see what I am doing wrong? I can't believe that apache2 would get 
distributed with such a crude bug. I'm using Apache 2.4.9 on Debian Jessie in 
case it matters.

Roger

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