Complete this assignment with the same team you worked with for Continuations (Written). You and your partner should each understand the entire program but you only need one hand in.

Assignment Task

Repeat the Raw Web Programming assignment using the PLT Scheme Web Server. Instructions for installing and using the PLT Web Server follow.

Include a readme file in your submission. In it, list the names of the people in your group. Additionally, contrast 3-5 language features that you used in this assignment to the language features encountered in the Raw Web assignments. Even if the members of your group used different languages in the Raw Web assignment, all of you are still responsible for understanding the presented response. The analysis should be 2 paragraphs or fewer. Grammar and word choice matter.

Installing the Web Server

Finding Servlets and Pages

Static content (web pages, images, etc) are found in htdocs/. For example, htdocs/index.html is the page you see when you visit http://localhost:8080/.

Servlets are found in servlets/. For example, the file servlets/examples/ contains the code for the servlet at the URL http://localhost:8080/servlets/examples/ There are many examples in this directory; we suggest reading and tweaking with a few of them to get started.

Writing Servlets

You may write your servlets in DrScheme and save them in the servlets/ directory. Use this template for your servlets:

(module servlet mzscheme
  (require (lib "" "web-server")
           (lib "" "lang")
           (lib "" "plai"))
  (provide interface-version timeout start)

  (define interface-version 'v1)
  (define timeout +inf.0)
  (define (start initial-request)
    ; initial page goes here

If you change a servlet while the server is running, the web server will not reload it unless you explicitly instruct it to do so by visiting http://localhost:8080/conf/refresh-servlets. Note that when you do so, all suspended servlets are terminated.


You may notice sample servlets quoting lists with ` instead of '. This is called quasiquoting, as opposed to quoting. Quasiquoting lets you evaluate specific elements of a quasiquoted expression instead of directly returning the expression. To force evaluation of an element in a quasiquoted expression, prefix the element with a comma. For example, to generate the list '(1 2 3 4) you may write `(1 2 ,(+ 0 3) 4). Quasiquoting is a convenient way to insert dynamic elements into HTML templates. If you want more information or examples, the Scheme standard is a good place to look.


Only one member of your group should handin the assignment; we don't want duplicate submissions. From the root directory of your web-server, execute:

/course/cs173/bin/cs173handin pltweb

Ensure that your README file is in root directory.