URLConnections - Java Network Programming - page 202

}
} catch ( RuntimeException ex ) {
continue ;
}
}
}
public Date getMaxAge () {
return maxAge ;
}
public Date getSharedMaxAge () {
return sMaxAge ;
}
public boolean mustRevalidate () {
return mustRevalidate ;
}
public boolean proxyRevalidate () {
return proxyRevalidate ;
}
public boolean noStore () {
return noStore ;
}
public boolean noCache () {
return noCache ;
}
public boolean publicCache () {
return publicCache ;
}
public boolean privateCache () {
return privateCache ;
}
}
A client can take advantage of this information:
• If a representation of the resource is available in the local cache, and its expiry date
has not arrived, just use it. Don't even bother talking to the server.
• If a representation of the resource is available in the local cache, but the expiry date
has arrived, check the server with HEAD to see if the resource has changed before
performing a full GET .