In this lab youll create a web app (a web server program) that tells the user (whos viewing the resulting webpage in a browser) a knock-knock joke. This will involve creating a simple web server program like in class (i.e., a program listening on a given tcp port that then, whenever a new request arrives, talks in http over the resulting socket with the sender of that request) that asks the users a knock-knock joke over a series of http request/response roundtrips. This will involve generating html (in particular simple html forms), get parameters, and cookies. Entry from form = get params! Which step / if error mode = cookies! Define a cookie (named, say, state) that encodes what step of the joke-telling process you are in. (A cookie, not a Java var, because multiple users (webbrowsers) can simultaneously be on different steps with the server.) Details (more to come): First visit to the page (e.g. localhost:8080) (example logic: state = 0, or state cookie doesnt exist) return an html page (the message Knock knock! and an html form with a text entry box and a submit button) and set state cookie to (say) 1 in http response header Entering Whos there? (state = 1) a message with NAMEOFWHOSTHERE and another text box/button form (and set state cookie to 2) Entering anything else an error message telling them theyre supposed to say Whos there? and the form again Entering NAMEOFWHOSTHERE + who? (state = 2) Entering anything else similar error behavior Message with NAMOFWHOSTHEREWHO, and a start over button (and reset state cooke to 0) Pressing button original screen Servers logic upon receiving new http request: read state cookie, it should be 0/1/2 or missing (treat missing as being 0) read get param text (either the string that the user entered, or missing) if state == 0/missing: return KNOCKKNOCK webpage, with state set to 1 in header if state == 1: if text case-insens-equals whos there?: return NAMEOFWHO webpage, setting state to 2 in header else: return KNOCKKNOCKAGAIN webpage, setting state to 1 (no change) in header if state == 2: if text case-insens-equals NAMEOFWHO who?: return WHOLEFUNNYNAME webpage (with no text entry box, just a start over button), setting state to 0 in header else: return NAMOFWHOSTHERWHOAGAIN webpage, setting state to 2 (no change) in header KNOCKKNOCKAGAIN webpage: same as KNOCKKNOCK webpage, except complaining that they didnt correctly enter whos there? like theyre supposed to.

WITH CODE PLEASE!