local version of the document for lecture
Examples. You will need to fix them if you want to play with them on the server.

• cookie.html: setting a cookie on the browser in html, see the meta element. Load the page in a browser and then take a look at the browsers cookies.
• cookie.php: setting a cookie in php. This one comes in as part of the http header. to see this # simulate http://cp3101b-1.comp.nus.edu.sg/~arnold/chttp/cookie.php # Note: cp3101b-1.comp.nus.edu.sg is the particular machine. # Host: cp3101b-1.comp.nus.edu.sg is an HTTP/1.1 feature which tells the web server which particular domain # to serve files from for this request. This allows a single machine to serve # files for zzz.com, www.com, stuff.com etc. telnet cp3101b-1.comp.nus.edu.sg 80 GET /~arnold/chttp/cookie.php HTTP/1.1 Host: cp3101b-1.comp.nus.edu.sg ----- above is client request ----- hit return a few times here!! ----- below is server responce HTTP/1.1 200 OK Date: Tue, 21 Jan 2014 11:37:57 GMT Server: Apache/2.4.6 (Ubuntu) X-Powered-By: PHP/5.5.3-1ubuntu2.1 Set-Cookie: mySecret=this+is+a+hugh+secret Content-Length: 1 Content-Type: text/html or you can just load this in your browser and check the browsers cookies.
• getCookies.php: list the cookies the browser just sent the server
• login.html, protectedContentHTML.php, logout.html: try visiting protectedContentHTML.php before visiting login.php, and after, then visit logout.html and try visiting protectedContentHTML.php. Think about why this is not good security. # simulate http://cp3101b-1.comp.nus.edu.sg/~arnold/chttp/protectedContentHTML.php telnet cp3101b-1.comp.nus.edu.sg 80 GET /~arnold/chttp/protectedContentHTML.php HTTP/1.1 Host: cp3101b-1.comp.nus.edu.sg Cookie: is_logged_in=true ----- above is client request ----- hit return a few times here!! ----- below is server responce HTTP/1.1 200 OK Date: Tue, 21 Jan 2014 11:38:29 GMT Server: Apache/2.4.6 (Ubuntu) X-Powered-By: PHP/5.5.3-1ubuntu2.1 Content-Length: 45 Content-Type: text/html You are logged in, so can access the content.
• session.php: starting a session in php. php sends a PHPSESSID, but the session data resides on the server. # simulate http://cp3101b-1.comp.nus.edu.sg/~arnold/chttp/session.php telnet cp3101b-1.comp.nus.edu.sg 80 GET /~arnold/chttp/session.php HTTP/1.1 Host: cp3101b-1.comp.nus.edu.sg ----- above is client request ----- hit return a few times here!! ----- below is server responce HTTP/1.1 200 OK Date: Tue, 21 Jan 2014 11:39:27 GMT Server: Apache/2.4.6 (Ubuntu) X-Powered-By: PHP/5.5.3-1ubuntu2.1 Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Set-Cookie: PHPSESSID=s52io6qs0p94ubic2kuq49ffg7; path=/ Content-Length: 0 Content-Type: text/html
• sess: the directory where the session data are stored.
• login.php, protectedContent.php: as above, only this time using a session variable. You can't play the same game as above. You can hijack a session though.