Assignment 3.3 Web File Browser Solution

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In this assignment, you need to use python3 asyncio stream to create a web file browser. HTTP/1.0 should be used, because HTTP/1.1 supports keep-alive, which makes our implementation complex.


When running in a directory, your server home page should be the list of files.


An example is given.
















  1. Logic


  1. Your server should only support GET/HEAD method. For more details about the difference between GET and HEAD method, please read the slides. When receive other method (POST etc.), you should return an error code 405 Method Not Allowed.


  1. Remember to add Connection: closeto your response header.


  • When receive a request path, check if it is a directory.


You might want to add ‘./’ to the client path to make sure you are working on current directory.

path = ‘./’ + header.get(‘path’)


If the path is a directory, render a html page with files and directories listed in it.


  1. If the path is a file, return the file with a correct mime type. If server cannot decide the mime type from the file extension (.exe, .mp3, etc.), the mime type should be application/octet-stream.


  1. If the path doesn’t exist, return an error 404 Not Found.


CS305 Computer Network Lab Tutorial


  1. Functions you might need


  1. listdir


This can list current directory or a given path.


  1. path.isfile


This function can check if a path is a file.






















  • path.getsize


This function can get the filesize in bytes, which might be useful if you want to add Content-Length to your response header.


  1. open Example:

file = open(name) writer.write(

Calling these function may raise FileNotFoundError Exception, you can organize your code like follow example:




  • some server logic except FileNotFoundError:


  • write 404 Not Found Response


CS305 Computer Network Lab Tutorial


  1. HTML Example


<html><head><title>Index of .//</title></head> <body bgcolor=”white”>


<h1>Index of .//</h1><hr> <pre>


<a href=”dir1/”>dir1/</a><br> <a href=”dir2/”>dir2/</a><br> <a href=”file1″>file1</a><br> <a href=”file1″>file1</a><br> </pre>