Pico Web Server

#!/usr/bin/python3
from time import sleep
from os import stat
from random import randrange as rng # using this for random cache time between 1 and 2 weeks
from gc import mem_free as fram
from gc import collect as clearRAM
import network
import socket

def file_exists(filename):
    try:
        return (stat(filename)[0] & 0x4000) == 0
    except OSError:
        return False

ssid="Your's WiFi"
password="12345678"
# WOW much security; This is fine...

wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)

max_wait = 10
while max_wait > 0:
    if wlan.status() < 0 or wlan.status() >= 3:
        break
    max_wait -= 1
    print('Waiting for connection...')
    sleep(1)

if wlan.status() != 3:
    raise RuntimeError('network connection failed')
else:
    print('connected')
    status = wlan.ifconfig()
    print( 'ip = ' + status[0] )

addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]

s = socket.socket()
s.bind(addr)
s.listen(1)

print('Listening on', addr,'\n\n')

while True:
    try:
        cl, addr = s.accept()
        print('Client connected from', addr)
        request = cl.recv(1024)

        request = str(request)
        request=request.split("\\r\\n")[0].split(' ')

        if len(request) > 0:
            if request[0]=="b'GET":
                if request[1] == "/":
                    request[1] = "/index.html"
                if request[1] == "/favicon.ico":
                    request[1] = "/favicon.png"

                file='www'+request[1]
                if file_exists(file):
                    header='HTTP/1.0 200 OK\r\nContent-type: '
                    if request[1].find('.html') > 0:
                        header+='text/html'
                    elif request[1].find('.css') > 0:
                        header+='text/css'
                    elif request[1].find('.js') > 0:
                        header+='application/javascript'
                    elif request[1].find('.webp') > 0:
                        header+='image/webp'
                    elif request[1].find('.gif') > 0:
                        header+='image/gif'
                    elif request[1].find('.png') > 0:
                        header+='image/png'
                    elif request[1].find('.jpg') > 0:
                        header+='image/jpeg'
                    elif request[1].find('.gif') > 0:
                        header+='image/gif'
                    else:
                        print('Not Implemented:', file,'\n')
                        cl.send(header+'text/plain\r\n\r\nFile type not impliemted')
                        cl.close()
                        print('Closed connection\n')
                        continue

                    end=stat(file)[6]
                    print('Open',end,':',file,'with', fram())
                    if(end*1.1 < fram()): # end*1.1 is to be sure we are not completely out of memory, in theory you do not need the *1.1
                        cl.send(header+'\r\nContent-Language: pt-BR\r\nCache-Control: max-age='+str(rng(604800,1209600))+'\r\n')
                        with open(file, 'rb') as f:
                            cl.send('Content-Length:'+str(end))
                            f=f.read()
                            cl.send('\r\n\r\n')
                            cl.sendall(f)
                    else:
                        print("Low Ram: Offload",file,"to alt server")
                        # this is gonna be a issue if it happens to index.html
                        cl.send('HTTP/1.0 301 OK\r\nLocation: http://10.0.0.25:8080/thermostat/'+file[4:])
                elif request[1].find('.json') >0:
                    print('Emulate:',file)
                    if file[0:13] == "www/temp.json":
                        json='{"temp":"20000","tube1":0,"tube2":1,"relay1":0,"relay2":1}'
                    elif file[0:15] == "www/config.json":
                        json='{"target": 72.5, "format": "F", "auxon": 1, "auxenabled": 1, "enabled": 1, "auxoff": 2, "trigger": 1, "sunset": 30, "night": 0, "day": 0, "sunrise": 90}'
                    elif file[0:12] == "www/sun.json":
                        json='{"rise":{"time":"6:59 AM","hour":6,"minute":59,"stamp":1664103540},"set":{"time":"6:56 PM","hour":18,"minute":56,"stamp":1664146560}}'
                    elif file[0:13] == "www/cron.json":
                        json='[{"enable":false,"days":[6,0],"time":{"start":{"h":22,"m":30},"end":{"h":23,"m":59}},"offset":-0.45,"name":"1. Chad wants cooler for sleep on weekend"},{"enable":false,"days":[1,0],"time":{"start":{"h":0,"m":0},"end":{"h":3,"m":0}},"offset":-0.45,"name":"2. Chad wants cooler for sleep on weekend"},{"enable":true,"days":[1,2,3,4,5,6,0],"time":{"start":{"h":4,"m":0},"end":{"h":10,"m":0}},"offset":-0.5,"name":"Lower temp in early morning"}]'
                    else:
                        json='{"Error":"File not implemented, typo?"}'
                    cl.send('HTTP/1.0 200 OK\r\nContent-type: application/json\r\nContent-Length: '+str(len(json))+'\r\nCache-Control: no-cache\r\n\r\n'+json)
                else:
                    print('404 Error',file)
                    cl.send('HTTP/1.0 404 OK\r\nContent-type: text/html\r\n\r\n<html><head><title>404 Error</title></head><body>404 File not found</body></html>')
            elif request[0]=="b'POST":
                print('Not Implemented: todo')
            else:
                print('Say what?:',request)
        else:
            print('Say what?:',request)
        cl.close()
        print('Closed connection\n')
        clearRAM()

    except OSError as e:
        cl.close()
        print('Connection closed; Error:',e,'\n')