godot http server

extends Node2D

var server = TCPServer.new()
var bind_address = "127.0.0.1"
var port = 3040 #39763
var backup_port = 67634

func try_start_server(err: int, attempt: int):
    match err:
        # code 0 no errors server listening
        0:
            if(attempt == 0):
                print("Server listening on http://%s:%s" % [bind_address, port])
            else:
                print("Server listening on http://%s:%s" % [bind_address, backup_port])
            return
        # err | failed to bind to port
        _:
            if(attempt == 0):
                print('error: starting http server on %s FAILED'  % [port])
                var new_err: int = server.listen(port, bind_address)
                try_start_server(new_err, 1)
            else:
                print('error: starting http server on %s FAILED' % [backup_port])
            server.stop()
            return


func _ready():
    set_process(true)
    var err: int = server.listen(port, bind_address)
    try_start_server(err, 0)
# handle connection
func _process(delta):
    if server.is_connection_available():
        var peer = server.take_connection()
        var status = peer.get_status()
        print("Got peer: ", peer.get_connected_host(), ":", peer.get_connected_port())
        handler(peer)


func handler(peer: StreamPeerTCP):

    var available_bytes := peer.get_available_bytes()
    if available_bytes == 0:
        print('delay')
        OS.delay_msec(100)

    var arr := peer.get_data(available_bytes)
    if arr[0] != OK:
        print_debug("Failed to get data (error ", arr[0], ")")
        return false
    var content = arr[1]
    var requestContent = PackedByteArray(content).get_string_from_ascii()
    var req_headers = requestContent.split('\r\n\r\n')[0].split('\r\n')
    var req_body = requestContent.split('\r\n\r\n')[0]

    var auth_ref_code
    for header in req_headers:
        if(header.contains('auth_ref_code:')):
            auth_ref_code = header.replace('auth_ref_code: ', '')
            print(auth_ref_code)
        else:
            print(':( no auth ref code provided')

    var response_content = "HTTP/1.1 200 OK\r\n"
    response_content += "Connection: Keep-Alive\r\n"
    response_content += "Host: Godot\r\n"
    response_content += "Content-Type: text/html; charset=utf-8\r\n"
    response_content += "Content-Length: {LGTH}\r\n\r\n"
    var body = "Hello World! From Godot\r\n"

    var res_length =body.length()
    response_content = response_content.replace('{LGTH}', str(res_length))
    response_content += body
    peer.put_data(response_content.to_ascii_buffer())