Chapter 23 WAN Optimization, Web Cache, Explicit Proxy, and WCCP : Configuring WAN optimization : Byte caching : Dynamic data chunking for byte caching
  
Dynamic data chunking for byte caching
Dynamic data chunking can improve byte caching by improving detection of data chunks that are already cached in changed files or in data embedded in traffic using an unknown protocol. Dynamic data chunking is available for HTTP, CIFS and FTP.
Use the following command to enable dynamic data chunking for HTTP in the default WAN optimization profile.
config wanopt profile
edit default
config http
set prefer-chunking dynamic
end
By default dynamic data chunking is disabled and prefer-chunking is set to fix.