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Web Technology Management Lecture III
 

Web Technology Management Lecture III

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    Web Technology Management Lecture III Web Technology Management Lecture III Presentation Transcript

    • The Principles of Web TechnologyManagement
      http://purl.org/net/wtm
      sopek@makolab.com
      Principia Webica
    • HTTP protocol, CGIweb application objects &
      Principles of Web Design
      HTTP
    • HTTP– RFC 2616http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol
      The Hypertext Transfer Protocol (HTTP) is a networking protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web.
      HTTP/0.9 — 1990, HTTP/1.0 —May 1996, HTTP/1.1 — June 1999
      The most important current document – RFC 2616 – defines HTTP/1.1 - http://tools.ietf.org/html/rfc2616
    • HTTP– mainfeaturesHTTP is …
      applicationLayerprotocol
      a Request-ResponseprotocolintheClient-Servercomputing model:
      Clients:UsersAgents – UA(browsers, crawlers, robots, spiders, proxies etc)
      Servers: Web Servers (includingproxies)
      statelessprotocol(each request as an independent transaction that is unrelated to any previous request so that the communication consists of independent pairs of requests and responses)
      resource(network data objects) based. Resources areidentified by URL (Uniform ResourceLocators)
    • HTTP– mainfeaturesHTTP basicoperational model
    • HTTP– mainfeaturesIX HTTP methods (verbs)
      HEAD
      GET
      POST
      PUT
      DELETE
      TRACE
      OPTIONS
      CONNECT
      PATCH
      Safemethods
      Idempotentmethods
    • HTTP– mainfeaturesNaked HTTP illustrated
    • CGI – CommonGatewayInterfaceTalk to yourserver
    • CGI – CommonGatewayInterfaceTalk to yourserver
      POST /tf.asp HTTP/1.1Host: www.ehandel.plContent-Type: application/x-www-form-urlencodedContent-Length: 14T3=z&B1=Submit
    • „Objects” of the Web ApplicationsFundamentalstructures
      Request
      Response
      Session
      Application
      Server
    • Server-sidesoftwareHarder part …
      Server-sidetechnologies and theirlanguages
      Pure CGI (any)
      PHP (php)
      ASP (VB,Jscript, Python)
      ASP.NET (any)
      JSP (Java)
      And …
      CFM
      Ruby on Rails …
    • Netcraftsurvey in March 2011.
      [edit]
      Server-sidesoftwareMost importantservers
      Server-sidesolutions
      Apache
      IIS
      Nginx
      GWS
      lighttpd
      http://en.wikipedia.org/wiki/Web_server
    • Client-sidesoftwareItused to be easier part …
      JavaScript (never to confusewith Java)
      VBScript (forgetit !)
      AJAX (JavaScript + XML)
      Flash/Flex
      SliverLight
    • Web software design principlesSir Tim-Berners-Leeagain …
      Simlicity
      Modular Design
      Tolerance
      Decentralization
      Test of Independent Invention
      Principle of Least Power
      Studythem: http://www.w3.org/DesignIssues/Principles.html
    • NEXT …
      Yourownvirtualserver !
    • Lab work6.
      Remeber: http://purl.org/net/wtm
      Explore the web for topics:
      Find out more about Stateless nature of HTTP protocol
      What is proxy? How it works ?
      Find out more about HTTP methods: TRACE, OPTIONS, PATCH
      Practice with manual execution of HTTP commands
      Find out more about classical CGI
      Find out more about Request, Response, Session, Application, Server objects of the Web programming
      Use Netcraft (www.netcraft.com) to find out interesting statistics about the Web.
      Read http://www.w3.org/DesignIssues/Principles.html and find out more about the principles in the other sources
      3 pages per topic