Description
Objective
The objective of this homework is to extend lab exercise and refresh your memory on the
following concepts and skills from “CSE-278: Systems 1” prerequisite course:
• Working with HTTP GET request and generating HTTP response
• Basic of I/O operations in C++
• Developing C++ program involving simple string manipulation.
• Working with command-line arguments.
• Practice developing properly styled programs
• Gain experience with testing via web-browser
Due before: 11:59 PM on Wed Sept 26 2020
Page 2 of 5
Grading Rubric:
The program submitted for this homework must pass necessary base case
test(s) in order to qualify for earning any score at all. Programs that do not
meet base case requirements or just skeleton code will be assigned zero score!
Program that do not compile, have even 1 method longer than 25 lines, or
just some skeleton code will be assigned zero score.
• -1 Points: for each warning generated by the compiler.
• NOTE: Violating CSE programming style guidelines is a compiler error! Your program
should not have any style violations reported in NetBeans when you compile it.
• Do not use global variables – that is not good programming practice.
• Base case: 20 points: Since this homework is just a recap of lab exercise on prerequisite
concepts you should be able to complete the 3 straightforward methods in this homework.
• Formatting & Documentation: 5 points (if your comments are poor, then you lose points
int his category)
Homework overview
In this homework you will be completing a webserver that can perform simple Natural Language
Processing (NLP) of counting words and
computing average word length. A screenshot of
the program operating via a web-browser is shown
in the adjacent figure. Specifically, your program
must operate as follows:
1. Your program will operate as a web-server based on URLs of the form:
a. http://os1.csi.miamioh.edu:8080/http://www.users.miami
oh.edu/raodm/ones.txt
b. http://os1.csi.miamioh.edu:4432/http://ceclnx01.cec.mi
maioh.edu/~raodm/miami_university.txt
2. Read a HTTP-GET request with URL in the format /http://Host:Port/Path
(e.g., /http://os1.csi.miamioh.edu:8080/~raodm/words.txt).
3. Obtain the specified file from the remote web-server using a suitable HTTP-GET request.
Here, your web-server also acts a web-client. This type of operation is called proxying. It
is commonly used in Tor (https://en.wikipedia.org/wiki/Tor_(anonymity_network)) and
other anonymizing services, which are important concepts & tools in cybersecurity.
4. Process the response from the remote web-server and calculate: word count, total number
of characters, and average word length. These are super-simple operations. So, don’t
overcomplicate them.
5. The output is generated in HTML format and returned as an HTTP response. See sample
output below.
Due before: 11:59 PM on Wed Sept 26 2020
Page 3 of 5
Starter Code
Several aspects of this homework have been covered in the previous lab exercise(s). Hence, ensure
you review previous exercise. The starter code with skeleton methods are supplied. Ensure you
scp all of the starter files to your NetBeans project. Your task is to:
1. Understand operations of the methods in the starter code. There are plenty of comments to
help you understand the starter code. When in doubt, ensure you ask clarifications about
the starter code so that you really understand the work you are doing.
2. The starter code can be run as a web-server, but troubleshooting incorrect output is
cumbersome with a web-browser. Note that web-browsers will not work even if 1-character
is incorrect in your output.
3. Hence the starter code is designed to read input from a file and print output so that it is
easier to troubleshoot. For this you will need to set command-line arguments in NetBeans.
Ensure you review the video on how to set command-line arguments from the Video
Demonstrations Page on Canvas. See Tips below for screenshot specific to this homework.
Testing with web-browsers
The key requirement for this homework is that your program must work correctly with a webbrowser. You may test operation of your program using the following URLs, by suitably
changing the port number below:
• http://os1.csi.miamioh.edu:8080/http://www.users.miamioh.edu/raodm/ones
.txt
• http://os1.csi.miamioh.edu:4432/http://ceclnx01.cec.mimaioh.edu/~raodm/
miami_university.txt
Sample inputs and outputs
Testing your program is best accomplished by supplying exactly the same inputs a web-browser
would generate. The starter code permits inputs to be supplied from a text file specified as a
command-line argument. The sample outputs below illustrate testing using command-line
arguments. This is the same approach that will be used when you submit your solution via
Canvas CODE plug-in.
Base case #1:
$ ./homework1 base_case1_inputs.txt
URL to be processed is: http://www.users.miamioh.edu/raodm/ones.txt
Processing file “/raodm/ones.txt” from “www.users.miamioh.edu”:”80″ …
HTTP/1.1 200 OK
Server: localhost
Connection: Close
Content-Type: text/html
Content-Length: 182
Analysis results
Number of words: 10
Total number of characters: 40
Average word length: 4 chars/word
Base case #2:
$ ./homework1 base_case2_inputs.txt
URL to be processed is: http://ceclnx01.cec.miamioh.edu/~raodm/miami_university.txt
Processing file “/~raodm/miami_university.txt” from “ceclnx01.cec.miamioh.edu”:”80″ …
Due before: 11:59 PM on Wed Sept 26 2020
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HTTP/1.1 200 OK
Server: localhost
Connection: Close
Content-Type: text/html
Content-Length: 195
Analysis results
Number of words: 15180
Total number of characters: 188493
Average word length: 12.4172 chars/word
Tips
1. Review and suitably use parts of code from previous exercise.
2. Review concepts of command-line arguments. Watch the video on setting command-line
arguments in NetBeans on Canvas ®Pages®NetBeans video
Demonstrations. Here is a screenshot of an example of command-line argument
settings for this homework in NetBeans:
3. Rest assured that I/O is trivial. See example in C++ review video Part 1: Introduction to
data types, conditionals, loops, and console I/O (PDF is in: Lecture Materials
®Cpp_Review®Part1_Cpp-Basics.pdf)
4. First write skeleton code with plenty of comments to help you work out the solution.
5. Save and compile often – you should type no more than 3-or-4 lines before saving
and compiling.
6. For troubleshooting use the debugger. There is video demonstrating the use of the
debugger in NetBeans Canvas ®Pages®Video Demonstrations. Ensure you
review the video on how to use the debugger.
Due before: 11:59 PM on Wed Sept 26 2020
Page 5 of 5
Turn-in:
This homework assignment must be turned-in electronically via Canvas CODE plug-in. Ensure
your C++ source code is named MUid_homework1.cpp (where MUid is your Miami Unique
ID). Ensure you have tested operations of your program with a web-browser. Once you have tested
your implementation, upload just your source code to Canvas.
