WWW and HTTP Study Notes Data Communication

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Lets See some Basic WWW HTTP study notes

  • The World Wide Web (WWW) is a repository of information linked together from
    points all over the world.
  • Hypertexts are documents linked to one another through the concept of pointers.
  • Browsers interpret and display a Web document.
  • A browser consists of a controller, client programs, and interpreters.
  • A Web document can be classified as static, dynamic, or active.
  • A static document is one in which the contents are fixed and stored in a server. The
    client can make no changes in the server document.
  • Hypertext Markup Language (HTML) is a language used to create static Web pages.
  • Any browser can read formatting instructions (tags) embedded in an HTML
    document.
  • Tags provide structure to a document, define titles and headers, format text, control
    the data flow, insert figures, link different documents together, and define executable code.
  • A dynamic Web document is created by a server only at a browser request.
  • The Common Gateway Interface (CGI) is a standard for creating and handling
    dynamic Web documents.
  • A CGI program with its embedded CGI interface tags can be written in a language
    such as C, C++, Shell Script, or Perl.
  • An active document is a copy of a program retrieved by the client and run at the
    client site.
  • Java is a combination of a high-level programming language, a run-time environment, and a class library that allows a programmer to write an active document and
    a browser to run it.
  • Java is used to create applets (small application programs).
  • The Hypertext Transfer Protocol (HTTP) is the main protocol used to access data
    on the World Wide Web (WWW).
  • HTTP uses a TCP connection to transfer files.
  • An HTTP message is similar in form to an SMTP message.
  • The HTTP request line consists of a request type, a URL, and the HTTP version
    number.
  • The uniform resource locator (URL) consists of a method, host computer, optional
    port number, and path name to locate information on the WWW.
  • The HTTP request type or method is the actual command or request issued by the
    client to the server.
  • The status line consists of the HTTP version number, a status code, and a status
    phrase.
  • The HTTP status code relays general information, information related to a successful
    request, redirection information, or error information.
  • The HTTP header relays additional information between the client and server.
  • An HTTP header consists of a header name and a header value.
  • An HTTP general header gives general information about the request or response
    message.
  • An HTTP request header specifies a client’s configuration and preferred document
    format.
  • An HTTP response header specifies a server’s configuration and special information
    about the request.
  • An HTTP entity header provides information about the body of a document.
  • HTTP, version 1.1, specifies a persistent connection.
  •  A proxy server keeps copies of responses to recent requests.

 

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