HTTP Reply Headers in Cache Entres - Are they "unmodified"?

Hi!

        Are these headers stored in the cache entries
        the "verbatim" headers received from the origin
        server or does squid store only the "useful"
        portions of the header (for optimisation reasons ...)?

        Please let me know.

        Thanks.

Dinesh

-- sample HTTP Reply Header in Cache Entry --
HTTP/1.0 200 OK
Date: Mon, 26 Jul 1999 09:15:56 GMT
Server: Stronghold/2.4 Apache/1.3.0 C2NetEU/2407 (Unix)
Last-Modified: Thu, 24 Sep 1998 21:42:46 GMT
ETag: "750d1d-1b1-360abcd6"
Accept-Ranges: bytes
Content-Length: 433
Content-Type: image/gif
Age: 1
X-Cache: MISS from cache-vsat.ernet.in
Proxy-Connection: close
Received on Tue Jul 27 1999 - 00:29:09 MDT