Assignment: Understanding the Request-Response Cycle

Your application will be a single index.php file with some elements in HTML, some elements in PHP, and some elements in JavaScript - all working in the same file. Make sure to save your screen shots JPG or PNG files and keep them less than 1MB. You must include the URL bar in all of your screen shots and the software must be running in your PHP server (i.e. file:// urls will not be accepted)

Your name must be in the <title> taglike 'Charles Severance Request/Response'
There should be an <h1> tag with your name and text like 'Charles Severance Request/Response'
You should use a <pre> tag to create ASCII art of the first letter of your name four spaces in from the left margin
Your code should use PHP to compute the SHA256 of your name and print it out like the sample application. You must compute this in your index.php file. The PHP code to achieve this for 'Charles Severance' is:
```
 
print hash('sha256', 'Charles Severance'); 
```
Your name must be in a JavaScript alert() box with text like 'Charles Severance in an alert box'
Your name must be in the console log with text like 'Charles Severance in the log'
Open this file and copy-paste its contents into a file named fail.php in the same folder as your index.php. Do not alter this file - do not fix the mistake in the code in this file. The goal is to trigger an error to verify that we see errors in the browser.
Open this file and copy-paste in the contents into a file named check.php in the same folder as your index.php.

You must run these files in your PHP server. Make a folder under your DOCUMENT_ROOT and then make sure your files are in that file. Sample DOCUMENT_ROOT values for some servers:

DOCUMENT_ROOT: c:\xampp\htdocs
DOCUMENT_ROOT: /Applications/MAMP/htdocs

You can check the DOCUMENT_ROOT value for your server by scrolling down in your PHPInfo output. You may have changed a setting in your PHP server to move the DOCUMENT_ROOT and that is OK as well.

Just make sure all the files are in a folder somewhere within DOCUMENT_ROOT and that all your testing uses localhost URLs like:

http://localhost:8888/wa4e/rrc/index.php

If you turn in screen shots with file:// in the URL you will get zero points for the assignment.

Sample solution

You can explore a sample solution for this problem at

http://www.wa4e.com/solutions/rrc/

Resources

There are several sources of information so you can do the assignment:

Lectures and materials on Introduction to Dynamic Web Content from www.wa4e.com
The Wikipedia page on HTTP - Hypertext Transfer Protocol
Chapters 23, 24, 25, and 26 from the free textbook The Missing Link: An Introduction to Web Development and Programming written by Michael Menendez and published by Open SUNY Textbooks.

What To Hand In

For this assignment you will hand in:

Image of your application showing the URL bar, alert box and the rest of the output.
Image of your application showing the URL bar, console and the rest of the output
Image of your application showing the URL bar and output of fail.php
Image of your application showing the URL bar output of check.php
Source code of your index.php

Grading

Please review carefully. The actual points are less important and useful comments about what might be wrong and need fixing. You cannot re-submit your assignment unless the instructor allows you to resubmit.

The total number of points for this assignment is 10. You will get up to 5 points from your instructor. You will get up to 3 points from your peers. You will get 1 for each peer assignment you assess. You need to grade a minimum of 2 peer assignments. You can grade up to 5 peer assignments if you like.

Sample Screen Shots

Optional Challenges

This section is entirely optional and is here in case you want to explore a bit more deeply and test your code skillz.

Here is a possible improvement:

The string that is your name is used in several places in the index.php file (PHP, HTML, and JavaScript). Make a single variable at the top of the file:
```
<?php
$name = 'Charles Severance';
?>
```
Then use that variable everywhere else in the file.

Provided by: www.wa4e.com