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HTTP version 11 specifies a persistent connection by default In a persistent connection, the server leaves the connection open for more requests after sending a response The server can close the connection at the request of a client or if a time-out has been reached The sender usually sends the length of the data with each response However, there are some occasions when the sender does not know the length of the data This is the case when a document is created dynamically or actively In these cases, the server informs the client that the length is not known and closes the connection after sending the data so the client knows that the end of the data has been reached
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HTTP version 11 specifies a persistent connection by default
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HTTP supports proxy servers A proxy server is a computer that keeps copies of responses to recent requests The HTTP client sends a request to the proxy server The proxy server checks its cache If the response is not stored in the cache, the proxy server sends the request to the corresponding server Incoming responses are sent to the proxy server and stored for future requests from other clients The proxy server reduces the load on the original server, decreases traffic, and improves latency However, to use the proxy server, the client must be configured to access the proxy instead of the target server
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For more details about subjects discussed in this chapter, we recommend the following books and sites The items in brackets [] refer to the reference list at the end of the text
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HTTP is discussed in s 13 and 14 of [Ste96], Section 93 of [PD03], 35 of [Com04], and Section 73 of [Tan03]
Sites
The following sites are related to topics discussed in this chapter
wwwietforg/rfchtml
Information about RFCs
RFCs
The following RFCs are related to WWW:
1614,1630,1737,1738
The following RFCs are related to HTTP:
2068,2109
KEY TERMS
Java Server Pages (JSP) nonpersistent connection path persistent connection proxy server request header request line request type response header static document status code status line tag uniform resource locator (URL) Web World Wide Web (WWW)
active document Active Server Pages (ASP) applet browser ColdFusion Common Gateway Interface (CGI) dynamic document entity header general header host Hypertext Markup Language (HTML) Hypertext Preprocessor (PHP) Hypertext Transfer Protocol (HTTP) Java JavaScript
WWW AND HITP
276 SUMMARY o The World Wide Web (WWW) is a repository of information linked together from
o o o
o o o
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
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