Web. Services. Web Technologies. Today. Web. Technologies. Internet WWW. Protocols TCP/IP HTTP. Apache. Next Time. Lecture # Apache.
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1 JSP, and JSP, and JSP, and 1 2 Lecture # JSP, and JSP, and Markup & presentation (HTML, XHTML, CSS etc) Data storage & access (JDBC, XML etc) Network & application protocols (, etc) Programming & scripting languages (Java, JSP etc) Heterogenous network of networks More than 1 billion users Handles the web, , file transfers, instant messaging, telecommunication etc JSP, and JSP, and Protocol (IP) Packet-oriented Uses IP-addresses ( )
2 JSP, and World Wide () JSP, and Hypertext Markup Language (HTML) clients and servers More than 1 billion web pages on More than 100 million sites More than 170 million TLDs (May 2008) HTML, graphics, and components Transfered via (over ) Text-based Content + Markup Interpreted and visualized by browsers Constitutes a small part of the resulting network traffic JSP, and Extensible Hypertext Markup Language (XHTML) JSP, and Uniform Resource Locator (URL) XML version of HTML Well-formed XML document Can be parsed by any XML tool Treated by browsers as a new version of HTML Contains Protocol (http) Address ( Port (80) Path (/kurser/5dv076/som-07/index.html) JSP, and Universally Unique Identifier (UUID) JSP, and Client 20269f4c f78-249fea2b2e6e Generated from MAC-addresses, timestamps, and random numbers Unique to a very high probability Requests resources via Interprets and presents the data retrieved Can be anything that requests data via Usually a web browser Uses URLs to reference resources Used as unique filenames, database ids etc
3 JSP, and Server JSP, and Domain Name System (DNS) Serves resources via Can be anything that serves data via Usually a dedicated server software May contain several pieces of software working together One server may serve several sites (and vice versa) A network of DNS servers Resolves IP-addresses = = Large sites often clustered for performance JSP, and Proxy JSP, and Firewall Acts as an intermediary between clients and servers A web proxy can, e.g., Enforce access control Block, filter or alter information Cache information Anonymize traffic Perform network address translation Regulates traffic between networks A firewall can, e.g., Enforce access control Block, filter or alter connections Perform network address translation Be stateless, stateful or application-aware JSP, and Actors JSP, and Specifies how information is exchanged in networks In which order In what format Transport level and application level protocols Built in protocol stacks
4 JSP, and JSP, and Hypertext Transfer Protocol () Packet-switched transport protocols Transport: Protocol (IP) Reliable: Transmission Control Protocol (TCP) Unreliable: User Datagram Protocol (UDP) Each computer has (at least one) IP-address IP-addresses are resolved using DNS-systems Packets are routed from sender to receiver Text-based Application-level protocol (mostly used over TCP) Client-driven (requests and responses) Stateless (sessions are stored in cookies or rewritten URLs) Can handle text as well as binary data (encoded as text) Packets can be lost, delayed or arrive in any order JSP, and Request JSP, and GET Request Example Request line (method + URI + protocol) Headers (request information) Body (optional) GET /kurser/5dv076/som-07/test.html /1.1 Host: JSP, and Response Status line (protocol + status code + reason phrase) Headers (response information) Body (response data) JSP, and Response Example / OK Date: Tue, 15 May :25:27 GMT Server: / (Unix) Accept-Ranges: bytes Content-Length: 50 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html; charset=iso <html> <head> </head> <body> test </body> </html>
5 JSP, and Request Methods JSP, and HEAD Request HEAD - simulate a get request GET - retrieve resource POST - submit data to resource PUT - upload resource Used to retrieve meta-information (headers) Simulates GET request DELETE - delete resource TRACE - echo request No body (data) in response OPTIONS - query server for supported methods CONNECT - create tunnel JSP, and GET Request JSP, and POST Request Used to retrieve resources from web servers Parameters stored in query string (limited size) Used to submit (form) data to resources Data stored in request body Default method for data retrieval Default method for data storage JSP, and PUT Request JSP, and Response Status Codes Directs client behavior Used to upload resources Data stored (encoded) in request body informational request successful resource unavailable / moved client-side error server-side error
6 JSP, and JSP, and Server Software Foundation Non-profit organization developing open-source software A (patchy) web server Arrived early and helped shape the web Runs 50% of the world s web sites (May 2008) Serves and S requests Runs CGI-scripts for dynamic content Can host modules for PHP, JSP, ASP etc JSP, and Tomcat JSP, and Axis2 Servlet & JSP container with built-in web server Can run standalone or as a module in Serves and S requests Requests may have been forwarded from D Server Contains configuration and management tools Service framework Refactorization of Axis Contains tools for generating language bindings and interfaces Includes a Service hosting environment Can run as a module / web application in Tomcat JSP, and Ant JSP, and Derby A build tool for software development Make for Java Used to automate build, deployment and clean-up A Pure-Java relational database management system Can be embedded into Java programs No configuration required No management clients provided Databases accessible through JDBC
7 JSP, and Other Related Project JSP, and Struts - web application framework Jakarta - server-side Java projects Xalan - XSLT processor Xerces - A validating XML parser... JavaServer Pages (JSP)
Server-Side Web Development JSP. Today. Web Servers. Static HTML Directives. Actions Comments Tag Libraries Implicit Objects. Apache.
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