Header
|
Description
|
Example
|
Allow
|
This header specifies the request
methods (GET, POST, etc.) that the server
supports.
|
Allow: GET, HEAD
|
Cache-Control
|
This header specifies the
circumstances in which the response document can safely be cached. It can
have values public, private orno-cache etc. Public means
document is cacheable, Private means document is for a single user and can
only be stored in private (nonshared) caches and no-cache means document
should never be cached.
|
Cache-Control: max-age=3600
|
Connection
|
This header instructs the browser
whether to use persistent in HTTP connections or not. A value
of close instructs the browser not to use persistent HTTP
connections and keep-alive means using persistent connections.
|
Connection: close
|
Content-Disposition
|
This header lets you request that the
browser ask the user to save the response to disk in a file of the given
name.
|
Content-Disposition: attachment;
filename="fname.ext"
|
Content-Encoding
|
This header specifies the way in which
the page was encoded during transmission.
|
Content-Encoding: gzip
|
Content-Language
|
This header signifies the language in
which the document is written. For example en, en-us, ru, etc.
|
Content-Language: da
|
Content-Length
|
This header indicates the number of
bytes in the response. This information is needed only if the browser is
using a persistent (keep-alive) HTTP connection.
|
Content-Length: 348
|
Content-Type
|
This header gives the MIME
(Multipurpose Internet Mail Extension) type of the
response document.
|
Content-Type: text/html; charset=utf-8
|
Expires
|
This header specifies the time at
which the content should be considered out-of-date and thus no longer be
cached.
|
Expires: Thu, 01 Dec 1994 16:00:00 GMT
|
Last-Modified
|
This header indicates when the
document was last changed. The client can then cache the document and supply
a date by an If-Modified-Since request header in later requests.
|
Last-Modified: Tue, 15 Nov 1994
12:45:26 GMT
|
Location
|
This header should be included with
all responses that have a status code in the 300s. This notifies the browser
of the document address. The browser automatically reconnects to this
location and retrieves the new document.
|
Location:
http://www.cbtsam.com/cl1/cbtsam-cl1-001.php
|
Refresh
|
This header specifies how soon the
browser should ask for an updated page. You can specify time in number of
seconds after which a page would be refreshed.
|
Refresh:5;
url=http://www.cbtsam.com/cl1/cbtsam-cl1-001.php
|
Retry-After
|
This header can be used in conjunction
with a 503 (Service Unavailable) response to tell the client how soon it can
repeat its request.
|
Retry-After: 120
|
Set-Cookie
|
This header specifies a cookie
associated with the page.
|
Set-Cookie: UserID=JohnDoe; Max
Age=3600; Version=1
|
