This is a simple HTTP server developed for Recurse Center's application.

http-server.py

#!/usr/bin/env python
#((2021-01-12)) For Recurse Center

import socket
import re

SERVER_HOST = "localhost"
SERVER_PORT = 4000

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind((SERVER_HOST, SERVER_PORT))
server_socket.listen(1)
print(f"Listening on port {SERVER_PORT}...")

http_200 = "HTTP/1.0 200 OK\n\n" #OK
http_400 = "HTTP/1.0 400 OK\n\n" #Syntax Error
http_404 = "HTTP/1.0 404 OK\n\n" #Path Error

#This is our memory storage
storage = dict()


def processAction(action, path):
    '''
    This function processes get and set actions
    Inputs:
        action: get or set
        path: path requested by the client
    '''
    keyvalues = re.search(rf"/{action}\?(\w+)\=(\w+)", path)

    #First, extract key and value from the path
    if keyvalues:
        key, value = keyvalues[1], keyvalues[2]
    else:
        response = http_400 + f"Received {action} request but it's a bad one and can't be processed"
        return response #Return early. No point in further processing

    #Process GET and SET
    if action == 'get' and key == 'key': #For correctly formatted GET
        response = http_200 + f"Received {action} request with key {keyvalues[1]} and value {keyvalues[2]}"
        if value in storage:
            respValue = storage[value] 
            response += f"\nValue for the requested key {value} is {respValue}"
        else:
            response += "\nAlas! No values found for the requested key"
    elif action == 'get': #For incorrectly formatted GET
        response = http_400 + f"Received {action} request but it's badly formatted."
    else: #For SET
        storage[key] = value
        response = http_200 + f"Received {action} request with key {keyvalues[1]} and value {keyvalues[2]}"
        response += "\nSET values successfully"

    return response
    

while True:
    client_connection, client_address = server_socket.accept()

    request = client_connection.recv(1024).decode()
    path = request.split('\n')[0].split()[1]
    print(path)

    if path == "/":
        response = http_200 + "Hello World"
    elif "/set" in path:
        response = processAction('set', path)
    elif "/get" in path:
        response = processAction('get', path)
    else:
        response = http_404 + "That's a 404. Path not known to server."

    client_connection.sendall(response.encode())
    client_connection.close()

server_socket.close()