CS101 Lecture 05: The World Wide Web. What You ll Learn Today Computer Science
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1 CS101 Lecture 05: The World Wide Web How the Web Works Publishing Web Pages Aaron Stevens 20 September 2012 What You ll Learn Today How does the WWW work? What are web servers, anyway? So I got some HTML pages and stuff. How do I make them show up on the web? Who can see my pages? 1
2 The World Wide Web The World Wide Web A system of interlinked hypertext documents and other resources accessed via the Internet. Tim Berners-Lee invented the WWW circa The World Wide Web How do we find stuff on the web? Uniform Resource Locator A standard way of specifying the location of a resource, it s name, and how to get it. 2
3 Protocols A protocol is a set of rules governing the exchange or transmission of data between devices. How do you visit a website? You don t visit a website. The website gets delivered to you. 3
4 HTTP HyperText Transfer Protocol ~ht/whatareuris/ The Web Server? Web server: a software application which waits for/responds to HTTP requests. Tim Berners-Lee wrote 2 applications to make the web: A web browser called WorldWideWeb A server called HTTPd The first WWW Server at CERN. 4
5 Web Servers Contemporary web servers use highperformance hardware: (fast network and disk access) Pictured: IBM Blade Servers hosting files.myopera.com, photo from Wikipedia How a Web Server Works Receives HTTP Request Search for resource (file) on disk Send HTTP Response (status code + data) If not found: status 404 (NOT FOUND) If not permitted: status 403 (FORBIDDEN) Else: status 200 (OK) + send data Speaking of HTTP status codes, check out: 5
6 How to Publish a Web Page 1. Create HTML document, locate ancillary files (e.g images). 2. Transfer files to web server 3. Set permissions for read access 4. Test the URL in your browser cs-people.bu.edu Our WWW server is cs-people.bu.edu. Main page is Subdirectories for individual users: Example: 6
7 Your UNIX Home Directory Each user has a UNIX home directory: General form: /cs/course/<section>/<username>/ Example: /cs/course/cs101a2/azs/ This has a UNIX pseudonym of ~. Also mapped to your Windows Z:/ drive. Your WWW Directory The web server will map your URL: to your UNIX s account ~/public_html/ directory (or Z:/public_html/ on Windows). 7
8 Locate files in Finder/Windows Explorer Find your files on your local computer How to Transfer Files to csa2.bu.edu Use a file transfer client-program: Fetch (Mac) (a free academic license is available) WinSCP (Windows) (also free) 8
9 Connecting by WinSCP: Hostname: csa2.bu.edu Be sure to use the SFTP protocol WinSCP to csa2.bu.edu Local Computer WWW Server After you connect, transfer files by drag n drop. Then right-click to set permissions. 9
10 File Protection Users and Groups Many operating systems (for example, Unix) have a concept of users (each with unique username/password). Users are organized into groups. Example: I m in all of these groups: faculty3 cs108grades cs101stuff cs108stuff cs101grades Example: you are in one of these group: cs101a2, cs101a3, cs101a4, cs101a5, cs101b2, cs101b3 or cs101b4 File Permissions Each file has its own set of permissions for: Reading, writing or executing Owner, group, or others This leads to a 3x3 matrix of permissions: 10
11 Setting Permissions by WinSCP Right-click to open this dialog Set the permissions to 644 Transferring File by Fetch Use drag n drop interface to transfer files WWW Server Then use the Get Info button to set permissions. 11
12 Setting Permissions by Fetch Set permissions to 644 Testing the Webpage: After uploading the files, test in your browser: 12
13 index.html There are two special filenames that the web server looks for automatically: home.html! index.html Create the file index.html as the main landing page for your website, which corresponds to the URL: Example: What You Learned Today HTTP revisted, Web server UNIX home directory File Transfer Protocol UNIX File Permissions index.html 13
14 Announcements & To Do List Readings: HTML Tutorial Reed ch 3, pp (today) HW 3 due 9/25 14
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