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CISC103 Web Development Basics: Web site:
All assignments and information is posted on web site All assignments must be submitted via Canvas All labs Are due Thursday at midnight All Homeworks are due MOnday at Midnight unless otherwise noted INSTALL Notepad++ or Text Wrangler on your COmputer
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Intro to the Internet Internet: a network of network
The internet consists of thousands of smaller networks They may be educational, commercial, nonprofit, military organizations, etc.
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Brief History Internet History
Began with 1969’s ARPANET for US Dept. of Defense 62 computers in 1974 500 computers in 1983 28,000 computers in 1987 Early 1990s, multimedia (www) became available on internet Today: 3,840,675,500 Plus… (we’re running out of places to put everyone!)
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How Does the Internet Work?
Protocols set of rules Whenever you see a P in anything computer related, it’s a good guess to assume the P stands for protocol Internet uses TCP/IP Rules used for all internet transactions Base protocol on which all other protocols are built
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How Does the Internet Work?
TCP Deals with Transfer of Data how it is broken up and reassembled to be sent across the internet Packets Fixed-length blocks of data Files are broken up into packets Not all packets from the same file follow the same path Data is reassembled at the other end IP Addresses Internet Protocol Address – a unique address that identifies every computer and device connected to the internet
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Key Internet Model: Client/Server Model Built ON Top Of TCP/IP
Client: a computer requesting data or services Server: a host computer, a central computer supplying data or services requested of it Services can be requested over the internet E.g., Check your bank account Getting Downloading Web page Often multiple clients share the services of one server
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WWW The World Wide Web: uses client-server model client : Your browser
Browser requests web page from web server, Server: a computer or set of computers (ELSEWHERE) that gives web pages to clients. Client (browser) requests Web pages, images, sounds, movies, etc from Server. If Server can locate it, it sends it back to browser If it can’t locate it, it sends back an error
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Browsers Browsers do 2 key things:
Locate And request web sites Using unique addresses (URL) Read web pages and display them (displays html code, css, javascript, etc.) You don’t see the code, you see the display
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WWW: URL http://udel.edu/fall17/webfile.HTML URL
A website’s unique address It consists of The web communication protocol, http The domain name of the web server The directory or folder on that server The file within the directory, including optional extension protocol domain name Directory (folder) file name . extension
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Clients, Servers and the Web
HTTP: The internet protocol used to access the World Wide Web rules that govern communication between a web client and a web server Stands for HyperText Transfer Protocol HTTPS The secure version of HTTP
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The Web HTML Hypertext links connect one web document to another
The language used in writing and publishing web pages The set of tags used for formatting and linking to other documents on the web NOT a programming language (but it can contain programming code) Hypertext links connect one web document to another
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Other Terms CSS – Javascript Cascading Style Sheets
used for styling web page HTML is for formatting CSS is used for styling Javascript Client-side scripting language Not stand-alone, but an add-on to HTML Most popular scripting language L
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HTML 5.0 Template <!DOCTYPE html> <html lang = “eng-us”>
<head> <meta charset=“utf-8" > <title> </title> </head> <body> </body> </html> Validate at:
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