negation, optional parms
@@ -228,8 +228,8 @@ scenarios.</p>
<name>ProxyFCGISetEnvIf</name>
<description>Allow variables sent to FastCGI servers to be fixed up</description>
<syntax>ProxyFCGISetEnvIf <var>conditional-expression</var>
- <var>environment-variable-name</var>
- <var>value-expression</var></syntax>
+ [!]<var>environment-variable-name</var>
+ [<var>value-expression</var>]</syntax>
<contextlist><context>server config</context>
<context>virtual host</context><context>directory</context>
<context>.htaccess</context></contextlist>
@@ -264,10 +264,12 @@ the condition expressions and value expressions.</p>
</dd>
<dt>environment-variable-name</dt>
<dd> Specifies the CGI environment variable to change,
- such as PATH_INFO.</dd>
+ such as PATH_INFO. If preceded by an exclamation point, the variable
+ will be unset.</dd>
<dt>value-expression</dt>
<dd>Specifies the replacement value for the preceding environment variable. Backreferences, such as "$1",
-can be included from regular expression captures in <var>conditional-expression</var></dd>
+can be included from regular expression captures in <var>conditional-expression</var>.
+If omitted, the variable is set to an empty string.</dd>
</dl>
<example>
