Homework 4
Introduction to Networks and Their Applications
Due: April 11th, 2019
You are to develop a simple web server in Python. The web server must be started
with a two arguments specifying the IP address of the interface on which the server will
bind to and the port number on which the server will run. The server should handle http
requests such as (assuming the server is running on port 8000):
http://127.0.0.1:8000/index.html
http://127.0.0.1:8000/cars/ford.html
The server will store html static content in a local directory called static. Accordingly,
the above URLs will be resolved to the following files on the server:
URL file location
http://127.0.0.1:8000/index.html static/index.html
http://127.0.0.1:8000/cars/ford.html static/cars/ford.html
The server should implement the following logic:
Connection Setup: Create a socket to wait for incoming connections. The server
should be able to listen to 5 pending connections. Upon receiving a connection, you
should accept it and process the incoming http request as discussed in the next step.
Multiple Connections: You should support multiple connections and multiplex
between them using select.
HTTP Request: Your server should only handle HTTP GET requests. A complete
description of how an http request is formatted may be found in RFC 2616. For the
purposes of this assignment it is safe to assume the following restricted format:
GET SP Request-URI SP HTTP/1.1 CRLF
(HTTPKey:HTTPValue CRLF)*
CRLF
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In the above, the following notation is used: the text in blue will appear as it is in
the header packet. SP stands for space and CRLF for ’\r\n’. The RequestURI is the
request URI. The HTTPKey:HTTPValue are header fields that may appear. The
()* indicates that there could be zero or more header fields. Your server should read
these fields and make sure the header is formatted correct but it can safely ignore
them (i.e., you do not need to take any actions based on their values). The server
must make sure that the incoming request is consistent with the above format. It
is safe to assume that the RequestURI will not exceed 255 bytes. This functionality
should be process http header(socket) that returns the URI that is requested in
the case when the request is correctly formatted or None otherwise.
Responding to an HTTP request: There are three possible outcomes when
handling an HTTP request:
1. Bad Request: the HTTP request was invalid (i.e., it does not copy with the
above format). In this case your server should respond with a Bad Request
reply.
2. Not Found: if the HTTP request is valid, then your program the process http header
should store the RequestURI into the memory location pointed by uri variable.
The RequestURI must be translated into a file location as indicated in the URL
to file mapping table. After performing this translation, the server must check
if the request file exists. If it does not, the server should respond with a Not
Found error.
3. No errors: in the case when the file exists, the server shall read the contents of
the file and generate an HTTP reply.
Generating an HTTP reply: In the case of finding the appropriate file to server
on the web server, you need to send the content. However, you need to generate an
appropriate HTTP header. In our case the minimal HTTP header is:
HTTP/1.1 SP 200 SP OK CRLF
Content-Type: text/html
CRLF
CRLF
After sending the header, you can send the contents of the file.
As usual, you have to submit your homework through ICON. The following resources
may be useful in solving the homework: HTTP RFC (https://tools.ietf.org/html/
rfc2616).
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