keyword	Label	Jetty	Resin	Tomcat	Observations
a	remote IP address	NA	NA	request.getRemoteAddr() [S]	RemoteIPAddressConverter
A	local IP address			InetAddress.getLocalHost().getHostAddress() [S]	LocalIPAddressConverter
b	Content length	request.getConnection().getGenerator().getContentWritten();	Unless statusCode==304, response.getContentLength()	response.getContentCount();	JettyContentLengthConverter, ResinContentLengthConverter
c	Cookie	request cookies (dumps all of them}	dumps cookies by name, request cookie first, if unavailable then response cookie	request cookies, by name	RequestCookieConverter
h	remote IP addr	request.getRemoteAddr() [S]	request.printRemoteAddr, IP address string in textual presentation	request.getRemoteHost() [S]	RemoteHostConverter
H	request protocol			request.getProtocol()	RequestProtocolConverter
i	Incoming header	NA	request.getHeader(name) [S]	request.getHeader(header) [S]	RequestHeaderConverter
l	Remote logical username from identd	always '-'	always '-'	always '-'	NAConverter
n	attribute in the ServletRequest	NA	request.getAttribute(name) [S]	NA	RequestAttributeConverter, in tomcat %r is used
o	response header		response.getHeader(name) [NS]		not implemented although response.setHeader() method is available
r	First line of the request (method and request URI)	request.getMethod()+ request.getUri() [NS] +request.getProtocol()	request.getMethod() + request.getUriBuffer() [NS] + request.getProtocol()	request.getMethod() + request.getRequestURI() + request.getQueryString() + '?' + request.getProtocol();	RequestURLConverter
{}r	attribute in the ServletRequest	NA	NA	request.getAttribute(name) [S]	RequestAttributeConverter, in resin %n is used
s	status code	response.getStatus() [NS]	response.getStatusCode() [NS]	response.getStatus() [NS]	surprisingly, not in the Servlet API
{}t	request time stamp	getTimeStamp() [NS]	based on current time	based on current time	DateConverter
T	request processing duration in seconds	NA	request.getStartTime() - Alarm.getExactTime()	Valve measures invocation time
D	request processing duration in millis		request.getStartTime() - Alarm.getExactTime()	Valve measures invocation time
u	remote user	request.getRemoteUser() [S]	request.getRemoteUser() [S]	request.getRemoteUser() [S]	RemoteUserConverter
U	Requested URI path	NA	request.getRequestURI() [S}	request.getRequestURI() [S}	RequestURIConverter

Tomcat ====== %a - Remote IP address %A - Local IP address %b - Bytes sent, excluding HTTP headers, or '-' if zero %B - Bytes sent, excluding HTTP headers %h - Remote host name (or IP address if resolveHosts is false) %H - Request protocol %l - Remote logical username from identd (always returns '-') %m - Request method (GET, POST, etc.) %p - Local port on which this request was received %q - Query string (prepended with a '?' if it exists) %r - First line of the request (method and request URI) %s - HTTP status code of the response %S - User session ID %t - Date and time, in Common Log Format %u - Remote user that was authenticated (if any), else '-' %U - Requested URL path %v - Local server name %D - Time taken to process the request, in millis %T - Time taken to process the request, in seconds Resin =====