The HTTP Protocol - Wikimedia Commons HTTP Protocol HTTP Young Won ... GET /index.html HTTP/1.1...
24
Young Won Lim 02/26/2015 The HTTP Protocol ● HTTP ●
-
Upload
phungkhuong -
Category
Documents
-
view
227 -
download
3
Transcript of The HTTP Protocol - Wikimedia Commons HTTP Protocol HTTP Young Won ... GET /index.html HTTP/1.1...
Young Won Lim02/26/2015
The HTTP Protocol
● HTTP●
Young Won Lim02/26/2015
Copyright (c) 2013 -2015 Young W. Lim.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
Please send corrections (or suggestions) to [email protected].
This document was produced by using OpenOffice and Octave.
HTTP (1A) 3 Young Won Lim02/26/2015
HTTP
http://host:port/path?query
An HTTP request from a client to a server is simply sent using TCP
GET /index.html HTTP/1.1Host: www.example.comUser-Agent:Accept:Accept-Language:Accept-Encoding:Accept-Charset:Keep-Alive:Connection:Referer:
HTTP/1.1 200 OK Date: Server: Last-Modified: Etag: Accept-Ranges: Content-Length: Connection: Content-Type:
Client Server
URI HTML
HTTP Req
HTTP Rsp
HTTP Req Header
HTTP Rsp Header
HTTP (1A) 4 Young Won Lim02/26/2015
From URI to HTTP Req
http://www.google.com/search?q=Embedded+Web+Server
GET /search?q=Embedded+Web+Server HTTP/1.1Host: www.google.comUser-Agent:Accept:Accept-Language:Accept-Encoding:Accept-Charset:Keep-Alive:Connection:Referer:
HTTP Req Body (Empty)
HTTP Req Header
HTTP Req Body
POST /search HTTP/1.1Host: www.google.comUser-Agent:Accept:Accept-Language:Accept-Encoding:Accept-Charset:Keep-Alive:Connection:Referer:
q=Embedded+Web+Server
HTTP Req Header
HTTP Req Body
HTTP (1A) 5 Young Won Lim02/26/2015
HTTP Rsp Result Display
http://www.google.com/search?q=Embedded+Web+Server
HTTP (1A) 6 Young Won Lim02/26/2015
HTTP Rsp
HTTP/1.1 200 OK Date: Server: Last-Modified: Etag: Accept-Ranges: Content-Length: Connection: Content-Type:
HTTP Rsp Body (HTML contents)
HTTP Rsp Header
HTTP Rsp Body
HTTP (1A) 7 Young Won Lim02/26/2015
HTTP Request
Host:User-Agent:Refer:
Accept:Accept-Language:Accept-Encoding:Accept-Charset:
http://host:port/path?query
GET method
field: value
GET /index.html HTTP/1.1 Host: www.example.com
field:
HTTP (1A) 8 Young Won Lim02/26/2015
Response (1)
1xx: Informational2xx: Success
200 OK:206 Partial Content:
3xx: Redirection301 Moved Permanently304 Not Modified:307 Temporary Redirect
4xx: Client Error400 Bad Request401 Unauthroized404 Not Found406 Not Acceptable415 Unsupported Media Type
5xx: Service Error 500 Internal Server Error501 Not Implemented503 Service Unavailable
Status codes
HTTP/1.1 200 OK Date: Mon, 23 May 2005 22:38:34 GMT Server: Apache/1.3.3.7 (Unix) (Red-Hat/Linux) Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT ETag: "3f80f-1b6-3e1cb03b" Accept-Ranges: none Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8
1xx: Informational2xx: Success3xx: Redirection4xx: Client Error5xx: Service Error
HTTP (1A) 9 Young Won Lim02/26/2015
Response (2)
Field: value
HTTP/1.1 200 OK Date: Mon, 23 May 2005 22:38:34 GMT Server: Apache/1.3.3.7 (Unix) (Red-Hat/Linux) Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT ETag: "3f80f-1b6-3e1cb03b" Accept-Ranges: none Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8
Date:Server:Etag:Content-Length:Content-Type:Content-Encoding:Location:
HTTP (1A) 10 Young Won Lim02/26/2015
HTML Forms
form.html
<html><body> <form action="form_handler.php" method="GET"> User Name: <input name="user" type="text" /> <input type="submit" /> </form></body></html>
Form HandlingClient side languages: JavascriptServer side languages: PHP, JSP
<html><body><?php // This will print whatever the user put $name = $_GET['user']; echo "Hello, ". $name ."!";?></body></html>
form_handler.php
HTTP (1A) 11 Young Won Lim02/26/2015
HTTP Request Methods
GET Method
Form HandlingClient side languages: JavascriptServer side languages: PHP, JSP
POST MethodThe POST request method is designed to request that a web server accepts the data enclosed in the request message's body for storage.Query string will be placed in the body of the HTTP request
Requests a representation of the specified resource.Requests using GET should only retrieve data and should have no other effect. Query string is in the URI
GET Host: www.example.com
POST Host: www.example.comContent-Type:Content-Length:an empty line
HTTP (1A) 12 Young Won Lim02/26/2015
URL Encoding
key value pairsName: Jonathan DoeAge: 23Formula: a + b == 13%!
Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21
application/x-www-form-urlencoded
HTTP (1A) 13 Young Won Lim02/26/2015
GET Method
http://host:port/path?Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21
GET /path?Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21 HTTP/1.1
GET Method
GET Host: www.example.com
the HTTP GET request method is designed to retrieve information from the server. As part of a GET request, some data can be passed within the URI's query string, specifying for example search terms, date ranges, or other information that defines the query.
HTTP (1A) 14 Young Won Lim02/26/2015
POST Method
http://host:port/path?Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21
POST /path HTTP/1.1HOST: ...Content-Type: application/X-www-form-urlencodedContent-Length: ...Empty line
Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21
POST Method
POST Host: www.example.comContent-Type:Content-Length:an empty line
The POST request method is designed to request that a web server accept the data enclosed in the request message's body for storage.It is often used when uploading a file or submitting a completed web form.
HTTP (1A) 15 Young Won Lim02/26/2015
Authentication
IP-address-basedForm-basedHTTP BasicHTTP Digest
HTTP (1A) 16 Young Won Lim02/26/2015
Sessions
Hidden Form FieldsCookies
HTTP (1A) 17 Young Won Lim02/26/2015
SSL and TLS
Secure Sockets Layer (SSL)Transport Layer Security (TLS)
HTTP (1A) 18 Young Won Lim02/26/2015
Client and Server
HTTP architectures
HTTP (1A) 19 Young Won Lim02/26/2015
Proxy
Proxy
HTTP (1A) 20 Young Won Lim02/26/2015
Gateway
Gateway
HTTP (1A) 21 Young Won Lim02/26/2015
Tunnel
Tunnel
HTTP (1A) 22 Young Won Lim02/26/2015
Intermediate Nodes
A chain of intermediate systems
HTTP (1A) 23 Young Won Lim02/26/2015
Gnuplot and Canvas
In Gnuplot,
set terminal 'canvas'set output 'myplot.html'
set view 60, 30, 0.85, 1.1set samples 60, 60set isosamples 61, 61
set contour bothset cntrparam levels discrete 1, 4
set xrange [-2: 2]set yrange [-2: 2]set zrange [0: 4]splot sqrt(x**2+y**2)
HTTP (1A) 24 Young Won Lim02/26/2015
Reference
References
[1] http://en.wikipedia.org/[2] http://www.w3schools.com/[3] K.H. Koh, HTML, CSS, Javascript (in Korean)[4] Gnuplot manual
![[MS-HTTPE]: Hypertext Transfer Protocol (HTTP) Extensions€¦ · Hypertext Transfer Protocol (HTTP): An application-level protocol for distributed, collaborative, hypermedia information](https://static.fdocuments.net/doc/165x107/5fc2854a9f02264a2e3bc3b9/ms-httpe-hypertext-transfer-protocol-http-extensions-hypertext-transfer-protocol.jpg)
![[MS-HTTPE]: Hypertext Transfer Protocol (HTTP) Extensions...The Hypertext Transfer Protocol (HTTP) Extensions Protocol specifies a set of extensions to Hypertext Transfer Protocol](https://static.fdocuments.net/doc/165x107/60eb2628313cb27cf2480cf3/ms-httpe-hypertext-transfer-protocol-http-extensions-the-hypertext-transfer.jpg)
