header_access

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header_access

This directive defines a set of access rules for filtering HTTP headers from both requests and responses. You can use it to remove headers that may violate your privacy, or that cause interoperation issues. For example, this configuration removes Cookie headers sent to a well-known web advertising company:

 acl DC dstdomain .doubleclick.net header_access Cookie deny DC 

The header- name field must be one of the HTTP headers Squid knows about or one of the keywords Other or All . Squid currently knows the following HTTP headers:

 Accept 
 Accept-Charset 
 Accept-Encoding 
 Accept-Language 
 Accept-Ranges 
 Age 
 Allow 
 Authentication-Info 
 Authorization 
 Cache-Control 
 Connection 
 Content-Base 
 Content-Encoding 
 Content-Language 
 Content-Length 
 Content-Location 
 Content-MD5 
 Content-Range 
 Content-Type 
 Cookie 
 Date 
 ETag 
 Expires 
 From 
 Host 
 If-Match 
 If-Modified-Since 
 If-None-Match 
 If-Range 
 Last-Modified 
 Link 
 Location 
 Max-Forwards 
 Mime-Version 
 Negotiate 
 Pragma 
 Proxy-Authenticate 
 Proxy-Authentication-Info 
 Proxy-Authorization 
 Proxy-Connection 
 Public 
 Range 
 Referer 
 Request-Range 
 Retry-After 
 Server 
 Set-Cookie 
 Title 
 Transfer-Encoding 
 Upgrade 
 User-Agent 
 Vary 
 Via 
 WWW-Authenticate 
 Warning 
 X-Accelerator-Vary 
 X-Cache 
 X-Cache-Lookup 
 X-Forwarded-For 
 X-Request-URI 
 X-Squid-Error 
   

Unfortunately, you can't refer to an unknown header individually. The best you can do is use the keyword Other to refer to all unknown HTTP headers. The keyword All refers to all (known and unknown) HTTP headers.

Note that if you deny the Via header, Squid can't detect forwarding loops (see Section 10.2).

Removing headers from requests and responses is a violation of HTTP.


Syntax

 header_access   header-name   allowdeny [!]   ACLname   ... 

Default

No default

Example

 header_access From deny All 

Related

acl, header_replace

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Squid
Squid: The Definitive Guide
ISBN: 0596001622
EAN: 2147483647
Year: 2004
Pages: 401
Authors: Duane Wessels

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