配置文件ACL后添加：
header_access X-Cache deny all
header_access X-Squid-Error deny all
header_access Via deny all
header_access Server deny all
header_access X-Cache deny all
header_access X-Cache-Lookup deny all其它Header也可隐藏：
Accept HTTP_ACCEPT
Accept-Charset HTTP_ACCEPT-CHARSET
Accept-Encoding HTTP_ACCEPT-ENCODING
Accept-Language HTTP_ACCEPT-LANGUAGE
Accept-Ranges HTTP_ACCEPT-RANGES
Age HTTP_AGE
Allow HTTP_ALLOW
Authorization HTTP_AUTHORIZATION
Cache-Control HTTP_CACHE-CONTROL
Connection HTTP_CONNECTION
Content-Base HTTP_CONTENT-BASE
Content-Disposition HTTP_CONTENT-DISPOSITION
Content-Encoding HTTP_CONTENT-ENCODING
Content-Language HTTP_CONTENT-LANGUAGE
Content-Length HTTP_CONTENT-LENGTH
Content-Location HTTP_CONTENT-LOCATION
Content-MD5 HTTP_CONTENT-MD5
Content-Range HTTP_CONTENT-RANGE
Content-Type HTTP_CONTENT-TYPE
Cookie HTTP_COOKIE
Date HTTP_DATE
ETag HTTP_ETAG
Expires HTTP_EXPIRES
From HTTP_FROM
Host HTTP_HOST
If-Match HTTP_IF-MATCH
If-Modified-Since HTTP_IF-MODIFIED-SINCE
If-None-Match HTTP_IF-NONE-MATCH
If-Range HTTP_IF-RANGE
Last-Modified HTTP_LAST-MODIFIED
Link HTTP_LINK
Location HTTP_LOCATION
Max-Forwards HTTP_MAX-FORWARDS
Mime-Version HTTP_MIME-VERSION
Pragma HTTP_PRAGMA
Proxy-Authenticate HTTP_PROXY-AUTHENTICATE
Proxy-Authentication-Info HTTP_PROXY-AUTHENTICATION-INFO
Proxy-Authorization HTTP_PROXY-AUTHORIZATION
Proxy-Connection HTTP_PROXY-CONNECTION
Public HTTP_PUBLIC
Range HTTP_RANGE
Referer HTTP_REFERER
Request-Range HTTP_REQUEST-RANGE
Retry-After HTTP_RETRY-AFTER
Server HTTP_SERVER
Set-Cookie HTTP_SET-COOKIE
Title HTTP_TITLE
Transfer-Encoding HTTP_TRANSFER-ENCODING
Upgrade HTTP_UPGRADE
User-Agent HTTP_USER-AGENT
Vary HTTP_VARY
Via HTTP_VIA
Warning HTTP_WARNING
WWW-Authenticate HTTP_WWW-AUTHENTICATE
Authentication-Info HTTP_AUTHENTICATION-INFO
X-Cache HTTP_X-CACHE
X-Cache-Lookup HTTP_X-CACHE-LOOKUP
X-Forwarded-For HTTP_X-FORWARDED-FOR
X-Request-URI HTTP_X-REQUEST-URI
X-Squid-Error HTTP_X-SQUID-ERROR
Negotiate HTTP_NEGOTIATE
X-Accelerator-Vary HTTP_X-ACCELERATOR-VARY
Other: HTTP_OTHER:Squid3.0版本使用参数：
reply_header_access Server deny all
reply_header_access X-Cache deny all
reply_header_access Warning deny all
reply_header_access Expires deny all
reply_header_access Cache-Control deny all
reply_header_access age deny all