Adds some examples of using the ErrorLogFormat token handlers.

Standardizes the spelling of behavio(u)r to be consistent throughout the file.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1173086 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/mod/core.xml

@@ -1304,7 +1304,7 @@ in case of an error</description>
     <p>Specifying <code>connection</code> or <code>request</code> as first
     parameter allows to specify additional formats, causing additional
     information to be logged when the first message is logged for a specific
-    connection or request, respectivly. This additional information is only
+    connection or request, respectively. This additional information is only
     logged once per connection/request. If a connection or request is processed
     without causing any log message, the additional information is not logged
     either.</p>
@@ -1313,7 +1313,7 @@ in case of an error</description>
     example, the Referer header is only present if the log message is
     associated to a request and the log message happens at a time when the
     Referer header has already been read from the client.  If no output is
-    produced, the default behaviour is to delete everything from the preceeding
+    produced, the default behavior is to delete everything from the preceeding
     space character to the next space character.  This means the log line is
     implicitly divided into fields on non-whitespace to whitespace transitions.
     If a format string item does not produce output, the whole field is
@@ -1324,7 +1324,7 @@ in case of an error</description>
     (percent space) is a zero-witdh field delimiter that does not produce any
     output.</p>
 
-    <p>The above behaviour can be changed by adding modifiers to the format
+    <p>The above behavior can be changed by adding modifiers to the format
     string item. A <code>-</code> (minus) modifier causes a minus to be logged if the
     respective item does not produce any output. In once-per-connection/request
     formats, it is also possible to use the <code>+</code> (plus) modifier. If an
@@ -1336,6 +1336,29 @@ in case of an error</description>
     message is not higher than the specified log severity level. The number can
     range from 1 (alert) over 4 (warn) and 7 (debug) to 15 (trace8).</p>
 
+    <table border="1" style="zebra">
+    <columnspec><column width=".3"/><column width=".7"/></columnspec>
+
+    <tr><th>Modified Token</th><th>Meaning</th></tr>
+
+    <tr>
+    <td><code>%-{Referer}i</code></td>
+    <td>Logs a <code>-</code> if <code>Referer</code> is not set.</td>
+    </tr>
+
+    <tr>
+    <td><code>%+{Referer}i</code></td>
+    <td>Omits the entire line if <code>Referer</code> is not set.</td>
+    </tr>
+
+    <tr>
+    <td><code>%4{Referer}i</code></td>
+    <td>Logs the <code>Referer</code> only if the log message severity
+    is higher than 4.</td>
+    </tr>
+
+    </table>
+
     <p>Some format string items accept additional parameters in braces.</p>
 
     <table border="1" style="zebra">
@@ -1346,73 +1369,73 @@ in case of an error</description>
     <tr><td><code>%%</code></td>
         <td>The percent sign</td></tr>
 
-    <tr><td><code>%...a</code></td>
+    <tr><td><code>%a</code></td>
         <td>Remote IP-address and port</td></tr>
 
-    <tr><td><code>%...A</code></td>
+    <tr><td><code>%A</code></td>
         <td>Local IP-address and port</td></tr>
 
-    <tr><td><code>%...{<em>name</em>}e</code></td>
+    <tr><td><code>%{<em>name</em>}e</code></td>
         <td>Request environment variable <em>name</em></td></tr>
 
-    <tr><td><code>%...E</code></td>
+    <tr><td><code>%E</code></td>
         <td>APR/OS error status code and string</td></tr>
 
-    <tr><td><code>%...F</code></td>
+    <tr><td><code>%F</code></td>
         <td>Source file name and line number of the log call</td></tr>
 
-    <tr><td><code>%...{<em>name</em>}i</code></td>
+    <tr><td><code>%{<em>name</em>}i</code></td>
         <td>Request header <em>name</em></td></tr>
 
-    <tr><td><code>%...k</code></td>
+    <tr><td><code>%k</code></td>
         <td>Number of keep-alive requests on this connection</td></tr>
 
-    <tr><td><code>%...l</code></td>
+    <tr><td><code>%l</code></td>
         <td>Loglevel of the message</td></tr>
 
-    <tr><td><code>%...L</code></td>
+    <tr><td><code>%L</code></td>
         <td>Log ID of the request</td></tr>
 
-    <tr><td><code>%...{c}L</code></td>
+    <tr><td><code>%{c}L</code></td>
         <td>Log ID of the connection</td></tr>
 
-    <tr><td><code>%...{C}L</code></td>
+    <tr><td><code>%{C}L</code></td>
         <td>Log ID of the connection if used in connection scope, empty otherwise</td></tr>
 
-    <tr><td><code>%...m</code></td>
+    <tr><td><code>%m</code></td>
         <td>Name of the module logging the message</td></tr>
 
     <tr><td><code>%M</code></td>
         <td>The actual log message</td></tr>
 
-    <tr><td><code>%...{<em>name</em>}n</code></td>
+    <tr><td><code>%{<em>name</em>}n</code></td>
         <td>Request note <em>name</em></td></tr>
 
-    <tr><td><code>%...P</code></td>
+    <tr><td><code>%P</code></td>
         <td>Process ID of current process</td></tr>
 
-    <tr><td><code>%...T</code></td>
+    <tr><td><code>%T</code></td>
         <td>Thread ID of current thread</td></tr>
 
-    <tr><td><code>%...{g}T</code></td>
+    <tr><td><code>%{g}T</code></td>
         <td>System unique thread ID of current thread (the same ID as
             displayed by e.g. <code>top</code>; currently Linux only)</td></tr>
 
-    <tr><td><code>%...t</code></td>
+    <tr><td><code>%t</code></td>
         <td>The current time</td></tr>
 
-    <tr><td><code>%...{u}t</code></td>
+    <tr><td><code>%{u}t</code></td>
         <td>The current time including micro-seconds</td></tr>
 
-    <tr><td><code>%...{cu}t</code></td>
+    <tr><td><code>%{cu}t</code></td>
         <td>The current time in compact ISO 8601 format, including
             micro-seconds</td></tr>
 
-    <tr><td><code>%...v</code></td>
+    <tr><td><code>%v</code></td>
         <td>The canonical <directive module="core">ServerName</directive>
             of the current server.</td></tr>
 
-    <tr><td><code>%...V</code></td>
+    <tr><td><code>%V</code></td>
         <td>The server name of the server serving the request according to the
             <directive module="core" >UseCanonicalName</directive>
             setting.</td></tr>
@@ -1983,7 +2006,7 @@ wildcard matching available in 2.3.6 and later</compatibility>
     <strong>fail with an error</strong> saying the directory cannot be found.
     </p>
 
-    <p>For further control over the behaviour of the server when no files or
+    <p>For further control over the behavior of the server when no files or
     directories match, prefix the path with the modifiers <var>optional</var>
     or <var>strict</var>. If <var>optional</var> is specified, any wildcard
     file or directory that does not match will be silently ignored. If
@@ -3971,7 +3994,7 @@ handler</description>
 
     <note><title>Note</title>
     <p>Because <directive>SetHandler</directive> overrides default handlers,
-    normal behaviour such as handling of URLs ending in a slash (/) as
+    normal behavior such as handling of URLs ending in a slash (/) as
     directories or index files is suppressed.</p></note>
 </usage>
 
@@ -4078,10 +4101,10 @@ certain events before failing a request</description>
 
 <directivesynopsis>
 <name>TraceEnable</name>
-<description>Determines the behaviour on <code>TRACE</code> requests</description>
+<description>Determines the behavior on <code>TRACE</code> requests</description>
 <syntax>TraceEnable <var>[on|off|extended]</var></syntax>
 <default>TraceEnable on</default>
-<contextlist><context>server config</context><context>virtual host</context></contextlist>
+contextlist><context>server config</context><context>virtual host</context></contextlist>
 <compatibility>Available in Apache HTTP Server 1.3.34, 2.0.55 and later</compatibility>
 
 <usage>