The Web: an architectural view. Browser Render HTML Get URL Send HTML Get HTML file HTTPD File System The primitive Web model.

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Presentation transcript:

The Web: an architectural view

Browser Render HTML Get URL Send HTML Get HTML file HTTPD File System The primitive Web model

httpd The primitive Web model Internet HTTP Get Client Browser Server File System

Browser Render HTML Get URL with Params Send HTML Execute CGI(params) Build HTML on the fly HTTPD CGI Process A simple interactive Web model

httpd A simple interactive Web model Internet HTTP Get Cgi-bin process Client Browser Server File System

Browser Render HTML Get URL with Params Send HTML Execute CGI(params) Build HTML on the fly HTTPD CGI Process DB Run Sql query Send query results An evolved interactive Web model

httpd An evolved interactive Web model Internet HTTP Get Cgi-binQuery SQL process DB Data Client Browser Server File System

httpd The Bottlenecks Internet HTTP Get Cgi-binQuery SQL process DB Data Client Browser SLOW! Server File System

httpd The Bottleneck – part I Internet HTTP Get Cgi-binQuery SQL process DB Data Client Browser SLOW! Server File System

httpd The solution: Internet HTTP Get Cgi-binQuery SQL process DB Data Client Smart browser How? Including code in HTML Server File System reduce net traffic by having a smarter client!

Programming languages Java Java Enabling technologies Client Smart browser Scripting languages Javascript Javascript Vbscript Vbscript Perlscript Perlscript Python Python … … Interpreted: Source code travels Compiled: Executable travels (must be HW-OS-Browser independent!)

httpd The Bottleneck – part II Internet HTTP Get Cgi-binQuery SQL process DB Data Client Browser SLOW! Server File System

httpd The solution: Internet HTTP Get Query SQL Function DB Data Client Browser Server File System integrate the service into the httpd process

Enabling technologies Multithreading Multithreading DLL DLL Servlets Servlets Using… Scripting languagesScripting languages Programming languagesProgramming languages Function httpd Server How? Including code in HTML File System (depending on server implementation)

mixed client- and server-side scripting <HTML>… …VBScript Commands… </SCRIPT>… … …JavaScript Commands… </SCRIPT>…</HTML> Code executed by the Server BEFORE the page is transferred over the Net Code transferred to the client and interpreted by the Browser ASP Syntax

The state problem Internet Client 1 Server +CGI httpd Data User 1 Data User 2 Data User 3 Client 3 Client 2 ?

A typical solution Internet Client 1 Server +CGI httpd Data User 1 Data User 2 Data User 3 Client 3 Client 2 Cookie Cookie Cookie Supported by Java & JavaScript

httpd A more radical solution Internet HTTP Get Cgi-bin process Client Browser Server Java applet process Startup Socket connection Supported by Java

httpd An even more radical solution Internet HTTP Get Cgi-bin process Client Browser Server Java applet process Startup CORBA Middle Tier Supported by Java

WAP - CenniClient (cellular phone) MicroBrowser Gateway WAP Richiesta WDP + WTSL (Wireless Datagram Protocol) Wireless Transport Security Layer Server HTTP Descrizione delle pagine: Wml (Wireless Markup Language, in XML) Hdml (HandhelD Markup Language, variante di HTML 9600 baud (*) (*) con GPRS fino a 56 Kbit/sec, conUMTS fino a 2 Mbit/sec (Universal Mobile Telecommunication System) More info:

XML Enabled HTTP ServerClient DocumentServerHTTPServer XSLTProcessor HTTP request StylesheetServer Get document XML document Get SS XSL stylesheet XML + XSL HTML document HTML document