http proxy to establish tcp tunnel: HTTP proxy to establish TCP tunnel method

Hands-on with HTTP Proxy Tunneling

Recently, some friends asked me how to use the HTTP proxy to engage in TCP tunneling, this thing sounds mysterious in fact, especially simple. Let's use the most down-to-earth way today, break open the crumbs to talk about this matter.

Tunneling principles in layman's terms

An HTTP proxy is essentially asecond passer (in soccer)，把咱们的请求转给目标服务器。建立TCP隧道就是让代理服务器帮咱们和目标服务器保持长连接，好比在两者之间挖了条专属通道。举个栗子，你想访问某网站的数据库端口，但直接连会被防火代理拦住，这时候就需要代理来当中间人。

import socket

 Example of proxy configuration with ipipgo
proxy_host = "gateway.ipipgo.com"
proxy_port = 9021
target_host = "Target server IP"
target_port = 3306

proxy = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
proxy.connect((proxy_host, proxy_port))
proxy.send(f "CONNECT {target_host}:{target_port} HTTP/1.1rr".encode())
response = proxy.recv(4096)

Three axes for real-world configurations

Tip #1: Pick the right type of agent

Tip #2: Don't step on potholes with protocol settings

Remember that HTTP proxy only recognizes ports 80/443 by default, if you want to use other ports, you have to check with your service provider in advance. Like ipipgo's TK line supports customized ports, which is especially suitable for those who want to connect to the database.

Tip #3: Timeout Parameter Tuning

Tunnel keep-alive time is recommended to be set between 120-300 seconds, too short is easy to disconnect, too long is a waste of resources. If you use the ipipgo client, their intelligent keep-alive function will automatically optimize this parameter.

Frequently Asked Questions First Aid Kit

Q: The tunnel is built but the data can't be transmitted?
First check the response header of the proxy server, the normal is to return "HTTP/1.1 200 Connection established". If you see 407 error code, it is likely that the authentication did not pass, remember to add Authorization field in the request header.

Q: How can I avoid my IP being blocked by the target server?
With dynamic residential IP pools switching automatically, ipipgo's Enterprise package can change 100+ IPs per minute, much more reliable than manual switching.

Q: Will there be conflicts when I open more than one tunnel at the same time?
Not as long as you use a different proxy channel, it is recommended to open separate sub-accounts for each business. ipipgo supports multi-account management, and you can also set traffic quotas.

The doorway to choosing a proxy service

There are numerous agency service providers on the market, but those who can fulfill both the低、高匿名、协议全这三个条件的真不多。像ipipgo的跨境专线，实测能控制在50ms以内，比普通代理快3倍不止。

The design of their packages is also really good:

• Personal users choose dynamic residential (standard) enough, more than 7 dollars 1G traffic
• Enterprise level business directly on the enterprise version, more than 9 dollars also with exclusive customer service
• If you need a fixed IP to choose a static home, 35 dollars a month is quite a good deal!

最后唠叨句，用代理搞隧道千万要遵守当地法规。像游戏代理ip、数据采集这些合法用途完全没问题，但别拿来做违法乱纪的事儿。技术本无罪，关键看咋用不是？