Lab 7 - Writing a Web proxy

Lab 7 is due Monday, December 10 at 11:59pm. There will be no extensions to this deadline.

Resources

Lab 7 handout: postscript, PDF
All files for this lab are in /afs.cs.cmu.edu/academic/class/15213-f01/L7
Handin and evaluation:

Additional Information

Mon December 10

Demo locations:

Some people have difficulty in passing test cases gif.tst and pdf.tst. The reason could be that you used readline to receive data from the server. Since these test cases involve transfering binary files, please use readn to receive data from the server instead of readline. The general I/O flow should look like the following:

Sun December 9

IMPORTANT: The sign up sheets disappeared from where it should be. Since demos are coming soon, two new sign up sheets are put up on the door of WH 4112. Please go and sign up by 6pm Monday December 10. For those who signed up earlier, we are sorry about the inconvenience.

Wed December 5

On reception of a filtered request, your proxy should send back a permission denied message which has both the HEADER part and the CONTENT part. The CONTENT part is going to be compared by the test script. For clarification, the entire HTTP response is printed below:

"HTTP/1.0 403 Forbidden\r\nContent-type: text/html\r\n\r\n<html><head><title>Proxy Error</title></head>\n<body>You are not allowed to access this web page</body></html>\n"

Mon December 3

Demos will be 30-minute slots on Tue Dec 11 and Wed Dec 12. The sign-up sheets are available outside of WeH 4218.
Some brief ideas about demos:

We are going to use the final versions that you submit on line for testing. We will run the test script and also set up a real browser to test your proxy with a list of URLs. You might also be asked some questions related to your specific implementation.

Some of the test cases are updated and we have a new version of test script driver.pl accordingly. The new version of driver.pl can be obtained from the lab directory and is also included in the new tar file distribution.

Sun December 2

You are allowed to use functions defined in "csapp.h". We have provided the files "csapp.h", "csapp.c" and a new Makefile which would link in csapp.o in the lab file distribution. To use functions defined in csapp.h, you need:

You are going to be graded by demo this time. Each group will need to sign up a 30-minute time slot (more information about this will be posted early next week). However, for fairness, you still need to submit your solution electronically before the deadline. We will use the final version of your submissions for testing in the demo. Note: proxy.c is the only file you need to submit.

Last modified: Mon Nov 19 20:26:09 EDT 2001