%F in AccessLogValve

[francisco.sanmartin-gomez]

Hello,

I'm trying to use the %F in the AccessLogValve but all I'm getting in the logs 
is the string: "???F???"

This is the configuration in server.xml

<Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true">
        <Valve className="org.apache.catalina.valves.AccessLogValve" 
directory="logs"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b ttp: %D ttc: %F" />

      </Host>

And I'm using
Name        : tomcat7
Arch        : noarch
Version     : 7.0.39


Any ideas?

Thanks in advance.

Kind regards,

Francisco "Pako" Sanmartin