squid proxy port discovery

#!/usr/bin/python3

import sys, signal, requests

def def_handler(sig, frame):
    print("\n\n[!] Saliendo..\n")
    sys.exit(1)

# Ctrl+C
signal.signal(signal.SIGINT, def_handler)

#127.0.0.1 seria lo mismo que utilizar la ip 192.168.139.131 ya que la solicitud seria mediante el squid proxie que para el seria lo mismo que hacer la solicitud a si mismo)
main_url = "http://127.0.0.1"

squid_proxy = {'http': 'http://192.168.139.131:3128'}

def portDiscovery():

    # Conjunto de puertos TCP comunes a escanear
    common_tcp_ports = {
        20,    # FTP - File Transfer Protocol (Data)
        21,    # FTP - File Transfer Protocol (Control)
        22,    # SSH - Secure Shell
        23,    # Telnet
        25,    # SMTP - Simple Mail Transfer Protocol
        53,    # DNS - Domain Name System
        80,    # HTTP - Hypertext Transfer Protocol
        110,   # POP3 - Post Office Protocol version 3
        115,   # SFTP - Simple File Transfer Protocol
        119,   # NNTP - Network News Transfer Protocol
        123,   # NTP - Network Time Protocol
        143,   # IMAP - Internet Message Access Protocol
        161,   # SNMP - Simple Network Management Protocol
        194,   # IRC - Internet Relay Chat
        443,   # HTTPS - Hypertext Transfer Protocol Secure
        993,   # IMAPS - Internet Message Access Protocol over SSL/TLS
        995,   # POP3S - Post Office Protocol version 3 over SSL/TLS
        1080,  # Socks - Proxy
        1433,  # MSSQL - Microsoft SQL Server
        1521,  # Oracle database default listener
        1723,  # PPTP - Point-to-Point Tunneling Protocol
        3306,  # MySQL database system
        3389,  # RDP - Remote Desktop Protocol
        5432,  # PostgreSQL database system
        5900,  # VNC - Virtual Network Computing
        8080,  # HTTP Proxy
        8443,  # HTTPS-alt - Alternative HTTP Secure
        9100,  # Printer
        27017, # MongoDB database system
        27018, # MongoDB database system
        27019, # MongoDB database system
        28017, # MongoDB database system (Web Interface)
        50000, # SAP - Systems, Applications, and Products in Data Processing
        50070, # Hadoop HDFS NameNode default port
        50075, # Hadoop HDFS DataNode default port
        54321, # Pentaho Report Designer
        5500,  # VNC remote desktop protocol (RFB)
        5501,  # Hotline tracker server connection
        5672,  # RabbitMQ messaging system
        6379,  # Redis key-value store
        7001,  # WebLogic Server (SSL)
        8086,  # InfluxDB database
        8089,  # Splunk
        8888,  # Jupyter Notebook
        9000,  # Elasticsearch
        9042,  # Cassandra database
        9160,  # Cassandra database
        9200,  # Elasticsearch RESTful API
        9300,  # Elasticsearch transport
        10000, # Webmin - web-based system administration tool
        11211, # Memcached
        27015, # Valve Steam servers
    }

    for tcp_port in common_tcp_ports:

        # Realizar una solicitud GET a cada puerto en el servidor especificado
        r = requests.get(main_url + ':' + str(tcp_port), proxies=squid_proxy)

        if r.status_code != 503:
            # Si el código de estado de la respuesta no es 503 (Servicio no disponible), el puerto se considera abierto
            print("\n[+] Port " + str(tcp_port) + " - OPEN")

if _name_ == "_main_":

    portDiscovery()