Download as PDF, PPTX
![Sample
Exchange
KK605406LS-2:~ pohjus$ telnet www.jmarshall.com 80
Trying 192.220.73.220...
Connected to www.jmarshall.com.
Escape character is '^]'.
GET /index.html HTTP/1.0
HTTP/1.1 200 OK
Date: Mon, 18 Mar 2013 09:51:18 GMT
Server: Apache/1.3.42 (Unix) mod_auth_tkt/2.1.0 FrontPage/5.0.2.2635 mod_ssl/2.8.31
OpenSSL/0.9.8r
Last-Modified: Mon, 04 Feb 2013 20:21:01 GMT
ETag: "1d697f5-9f3-5110182d"
Accept-Ranges: bytes
Content-Length: 2547
Connection: close
Content-Type: text/html
<html>](https://image.slidesharecdn.com/http-connection-130318050915-phpapp02/85/About-Http-Connection-8-320.jpg)
Uploaded byJussi Pohjolainen
About Http Connection
HTTP is a network protocol used to deliver web resources like HTML files and dynamically generated content. An HTTP client like a web browser sends a request to an HTTP server using methods like GET and POST. The server responds with a status line indicating success or failure and may include a message body containing the requested resource. Requests and responses have an initial line followed by header lines and an optional message body. Common headers provide information about the client, server, resource properties and more.
More Related Content
Similar to About Http Connection
![Getting Started with Apache Spark: Big Data Made Simple [Free Meetup]](https://cdn.slidesharecdn.com/ss_thumbnails/apachesparkgettingstarted-260203175547-8361bcc3-thumbnail.jpg?width=640&height=640&fit=bounds)
About Http Connection
- 1.
- 2. HTTP network protocol • HTTP is a network protocol of the Web • Hypertext Transfer Protocol – Delivers resources on the WWW – Usually delivered by TCP/IP • HTTP client sends a request to HTTP server – Default port is 80 • Resource can be a file or dynamically generated query result (CGI, PHP …)
- 3. Structure of HTTP • Consists of request and response • Format – an iniPal line, – zero or more header lines, – a blank line, – opPonal message body (this is the resource) • Example – <initial line, different for request and response> – Header1: value1 – Header2: value2 – <optional message body>
- 4. IniPal Request Line • IniPal line is different for the request than response. • Request line has three parts – method name, local path to resource, version of hVp • Example – GET /path/to/file/index.html HTTP/1.0 • Method name can be GET, POST and HEAD
- 5. IniPal Response Line • The iniPal response line, called the status line • Typical status lines – HTTP/1.0 200 OK – HTTP/1.0 404 Not Found • Status code (200, 404) is computer-‐readable, reason phrase is human-‐readable • Status codes – 1xx, informaPon message – 2xx, success – 3xx, redirect – 4xx, client error – 5xx, server error • See all status codes – hVp://www.w3.org/Protocols/rfc2616/rfc2616-‐sec10.html
- 6. Header Lines • Header lines provide informaPon about the request and response – Header-‐name: value • HTTP 1.0 provides 16 headers, HTTP 1.1 46 headers • Client should tell who is making the request – From: – User-‐Agent: • Server should idenPfy – Server: – Last-‐modified:
- 7. Message Body • Message body contains the resource • Usually the message body includes header lines – Content-‐type: • MIME type of the resource, for example text/html, image/gif – Content-‐length • bytes
- 8. Sample Exchange KK605406LS-2:~pohjus$ telnet www.jmarshall.com 80 Trying 192.220.73.220... Connected to www.jmarshall.com. Escape character is '^]'. GET /index.html HTTP/1.0 HTTP/1.1 200 OK Date: Mon, 18 Mar 2013 09:51:18 GMT Server: Apache/1.3.42 (Unix) mod_auth_tkt/2.1.0 FrontPage/5.0.2.2635 mod_ssl/2.8.31 OpenSSL/0.9.8r Last-Modified: Mon, 04 Feb 2013 20:21:01 GMT ETag: "1d697f5-9f3-5110182d" Accept-Ranges: bytes Content-Length: 2547 Connection: close Content-Type: text/html <html>
- 9. POST Method POST/path/script.cgi HTTP/1.0 From: myname@email.com User-Agent: Some-tool Content-Type: application/x-www-form-urlencoded Content-Length: 32 name=jack&age=22
- 10. Exercise 1. Use telnet to make a connecPon to site, see response 2. Use some live hVp extension in browser to see hVp informaPon 3. Make a HTTP GET to www.whaPsmybrowser.com. Fake your "browser".