What is the use of SOCKS5 proxy? What is the difference between SOCKS4 and SOCKS5?

SOCKS proxy is divided into SOCKS4 and SOCKS5. What is the difference between the two? What is the use of SOCKS5 proxy? Since SOCKS proxy only transmits data packets, it is much faster than other application layer proxies. So what is the difference between SOCKS proxy and HTTP proxy? Let's learn about SOCKS proxy through Kookeey proxy.

What is the use of SOCKS5 proxy? SOCKS is a network transmission protocol, mainly used for intermediate communication between clients and external network servers. SOCKS is the abbreviation of "Sockets".

When a client behind a firewall wants to access an external server, it connects to a SOCKS proxy server. The proxy server controls the client's eligibility to access the external network and, if allowed, sends the client's request to the external server. The protocol was originally developed by David Koblas and later extended to version 4 by Ying-Da Lee of NEC. The latest protocol is version 5. Compared with previous versions, it adds support for UDP, authentication, and IPv6. According to the OSI model, SOCKS is a protocol at the session layer, located between the presentation layer and the transport layer.

Therefore, any SOCKS5 protocol can be used as a proxy. For example, QQ uses the UDP protocol, and SOCKS5 can be used. In other words, SOCKS5 supports TCP and UDP protocols, as well as authentication, server-side domain name resolution, etc. In actual applications, SOCKS proxies can be used as: email, newsgroup software, network paging ICQ, network chat MIRC, and using proxy servers to play games in various game applications such as Lianzhong. Whether it is a proxy game or a proxy web page, it can be a global proxy or a local proxy that only allows specified processes to use the proxy.

What is the difference between SOCKS4 and SOCKS5? SOCKS proxy is widely used, but SOCKS is divided into SOCKS4 and SOCKS5. SOCKS4 only supports TCP protocol, while SOCKS5 supports TCP and UDP protocols, as well as authentication and server-side domain name resolution. SOCKS4 can do what SOCKS5 cannot. Our commonly used chat software (such as QQ) all used UDP protocol at the beginning, so only SOCKS5 proxy can be used, while foreign ICQ uses TCP protocol, which is safer than UDP protocol, so SOCKS4 proxy can be used.

What is the difference between SOCKS proxy and HTTP proxy ?

1. HTTP:

Bill wants to download a web page from Jane's web server. Bill can't connect directly to Jane's server because there is a firewall on his network. To communicate with the server, Bill connects to his network's HTTP proxy. His web browser communicates with the proxy the same way he would if he connected directly to Jane's server; that is, the web browser sends a standard HTTP request header. The HTTP proxy connects to Jane's server and then sends any data returned by Jane's server back to Bill.

2.SOCKS:

Bill wants to communicate with Jane over the Internet, but there is a firewall between their networks, and Bill cannot communicate with Jane directly. Therefore, Bill connects to the SOCKS proxy on his network and tells it that he wants to establish a connection with Jane; the SOCKS proxy opens a connection that can pass through the firewall, facilitating communication between Bill and Jane.

SOCKS works at a lower level than HTTP proxies: SOCKS uses a handshake protocol to inform the proxy software of the connection that its client is trying to establish, and then operates as transparently as possible, while traditional proxies may interpret and rewrite the headers (for example, using other underlying protocols such as FTP; however, HTTP proxies simply forward HTTP requests to the desired HTTP server). Although HTTP proxies are used in different ways, the CONNECT method allows forwarding TCP connections; however, SOCKS proxies can also forward UDP traffic and reverse proxy, while HTTP proxies cannot. HTTP proxies usually understand the HTTP protocol better and perform higher-level filtering (although usually only for GET and POST methods, not for CONNECT methods).

The above introduces the purpose of SOCKS5 proxy in detail, analyzes the difference between SOCKS4 and SOCKS5, and the difference between SOCKS proxy and HTTP proxy. Through the above analysis, I believe everyone has a clear understanding of the price comparison of SOCKS proxy and chooses SOCKS reasonably.