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From Joe Orton <>
Subject [PATCH] mod_log_config %[bB] clarify
Date Mon, 24 Jan 2005 15:42:24 GMT
We keep seeing people confused that %[bB] mean different things in 2.0
to 1.3, and the docs don't really do a lot to help here.  Something like
this is more accurate and useful, I think: any comments?

Index: mod/mod_log_config.xml
--- mod/mod_log_config.xml	(revision 126293)
+++ mod/mod_log_config.xml	(working copy)
@@ -77,10 +77,10 @@
         <td>Local IP-address</td></tr>
-        <td>Bytes sent, excluding HTTP headers.</td></tr>
+        <td>Size of response in bytes, excluding HTTP headers.</td></tr>
-        <td>Bytes sent, excluding HTTP headers. In CLF format, <em>i.e.</em>
+        <td>Size of response in bytes, excluding HTTP headers. In CLF format, <em>i.e.</em>
         a '<code>-</code>' rather than a 0 when no bytes are sent.</td></tr>
@@ -237,6 +237,14 @@
     a backslash, and all whitespace characters which are written in their
     C-style notation (<code>\n</code>, <code>\t</code> etc).</p>
+    <p>Note that in httpd 2.0, unlike 1.3, the <code>%b</code> and
+    <code>%B</code> format strings do not represent the number of
+    bytes sent to the client, but simply the size in bytes of the HTTP
+    response (which will differ, for instance, if the connection is
+    aborted, or if SSL is used).  The <code>%O</code> format provided
+    by <module>mod_logio</module> will log the actual number of bytes
+    sent over the network.</p>
     <p>Some commonly used log format strings are:</p>

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