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Http Presentation
Presented by:Manoj Kirar PRN-060341076
Topics Covered
Http Overview Http Operation Http Message Http Method
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
2
Http Overview Uses TCP:
1-client initiates TCP connection to serve -generally port 80. 2-server accepts TCP connection from client 3-HTTP messages (application-layer protocol messages) exchanged between browser (client) and Web server (server). 4-TCP connection closed 10/14/08
Topic: HTTP
Presented by:Manoj Kirar
3
HTTP overview (cont.)
HTTP is “stateless” 1- Server maintains no information about past client requests. 2- Aside: Protocols that maintain “state” are complex! • past history (state) must be maintained • if server/client crashes, their views of “state” may be inconsistent
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
4
Http Operation 1a. client initiates TCP connection to HTTP server on port 80 1b. HTTP server at host waiting for TCP connection at port 80 “accepts” connection,notifying client
User enter some URL
2.HTTP client sends HTTP Request message (containing URL) into TCP connection.
10/14/08
3. HTTP server receives request message, forms response message containing requested object, and sends message into its socket Topic: HTTP
Presented by:Manoj Kirar
5
Http Operation (Cont.) 4.HTTP server closes TCP connection. 5.HTTP client receives response message containing html file, displays html.
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
6
Http Messages
Two types of HTTP messages: – Request – Response
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
7
Http Request Message
ASCII(human-readable form)
Request line
GET /somedir/page.html HTTP/1.1 Host: www.someschool.edu User-agent: Mozilla/4.0
Header line
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
8
Method types HTTP/1.1 1- GET, POST, HEAD 2- PUT– uploads file in entity body to path specifiedin URL field 3- DELETE – deletes file specified in the URL field
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
9
Http Response Message HTTP/1.1 200 OK Connection: close Server: Apache/1.3.0 Content-Length: 6821 Content-Type: text/html
Status line(protocol status Code)
Header line
Data e.g. requested HTML file 10/14/08
Topic: HTTP
Presented by:Manoj Kirar
10
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
11
Presented by:Manoj Kirar PRN-060341076
Topics Covered
Http Overview Http Operation Http Message Http Method
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
2
Http Overview Uses TCP:
1-client initiates TCP connection to serve -generally port 80. 2-server accepts TCP connection from client 3-HTTP messages (application-layer protocol messages) exchanged between browser (client) and Web server (server). 4-TCP connection closed 10/14/08
Topic: HTTP
Presented by:Manoj Kirar
3
HTTP overview (cont.)
HTTP is “stateless” 1- Server maintains no information about past client requests. 2- Aside: Protocols that maintain “state” are complex! • past history (state) must be maintained • if server/client crashes, their views of “state” may be inconsistent
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
4
Http Operation 1a. client initiates TCP connection to HTTP server on port 80 1b. HTTP server at host waiting for TCP connection at port 80 “accepts” connection,notifying client
User enter some URL
2.HTTP client sends HTTP Request message (containing URL) into TCP connection.
10/14/08
3. HTTP server receives request message, forms response message containing requested object, and sends message into its socket Topic: HTTP
Presented by:Manoj Kirar
5
Http Operation (Cont.) 4.HTTP server closes TCP connection. 5.HTTP client receives response message containing html file, displays html.
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
6
Http Messages
Two types of HTTP messages: – Request – Response
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
7
Http Request Message
ASCII(human-readable form)
Request line
GET /somedir/page.html HTTP/1.1 Host: www.someschool.edu User-agent: Mozilla/4.0
Header line
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
8
Method types HTTP/1.1 1- GET, POST, HEAD 2- PUT– uploads file in entity body to path specifiedin URL field 3- DELETE – deletes file specified in the URL field
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
9
Http Response Message HTTP/1.1 200 OK Connection: close Server: Apache/1.3.0 Content-Length: 6821 Content-Type: text/html
Status line(protocol status Code)
Header line
Data e.g. requested HTML file 10/14/08
Topic: HTTP
Presented by:Manoj Kirar
10
10/14/08
Topic: HTTP
Presented by:Manoj Kirar
11
