Please Whitelist This Site?

I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :)

If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads.

If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK.

Thanks for your understanding!

Sincerely, Charles Kozierok
Author and Publisher, The TCP/IP Guide


NOTE: Using software to mass-download the site degrades the server and is prohibited.
If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The Book is Here... and Now On Sale!

Get The TCP/IP Guide for your own computer.
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
      9  TCP/IP Key Applications and Application Protocols
           9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
                9  TCP/IP World Wide Web (WWW, "The Web") and the Hypertext Transfer Protocol (HTTP)
                     9  TCP/IP Hypertext Transfer Protocol (HTTP)
                          9  HTTP Message Headers

Previous Topic/Section
HTTP Message Headers
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
HTTP Request Headers
Next Topic/Section

HTTP General Headers
(Page 2 of 3)

Connection

Contains instructions that pertain only to this particular connection, and must not be retained by proxies and used for further connections. The most common use of this header is with the parameter “close”, as follows:

Connection: close

This overrides the default persistent connection behavior of HTTP/1.1, forcing the connection to terminate after the server's response. Connection is a hop-by-hop header.

Date

Indicates the date and time when the message originated. This is the same as the Date header in the RFC 822 e-mail format. A typical example would be:

Date: Wed, 06 Aug 2003 16:43:50 GMT
Pragma

Used to enable implementation-specific directives to be applied to all devices in the request/response chain. One common use of this header is to suppress caching by including “Pragma: no-cache” in a message. This has the same meaning as a “Cache-Control: no-cache” header, and is included in HTTP/1.1 for backward compatibility with HTTP/1.0 (which supports Pragma but not Cache-Control).

Trailer

When “chunked” transfers are used, certain headers may be placed as trailers, after the data being sent. In this case, the Trailer header is included before the data, and lists the names of the headers that are actually trailers in that message. This warns the recipient to look for them after the data. Trailer is a hop-by-hop header.

Transfer-Encoding

Indicates what encoding has been used for the body of the message, to ensure that it is able to be transferred properly between devices. This header is most often used with the “chunked” transfer method. Note that this header describes encoding applied to an entire message, and is thus not the same as the Content-Encoding entity header, which specifically describes the entity carried in a message. See the topic on content and transfer encodings for a full discussion. This header applies only to a single transfer, so it is a hop-by-hop header.


Previous Topic/Section
HTTP Message Headers
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
HTTP Request Headers
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.