Basic Proxy Server knowledge

1. What is a proxy server?

Proxy ServerProxy ServerThe proxy network user obtains network information. It is a transfer station for network information. The proxy server is between the browser and the other partyWebA server between servers, with which the browser does not directlyWebThe server sends a request to the proxy server to retrieve the webpage. The request signal is sent to the proxy server first. The proxy server retrieves the information required by the browser and sends it to your browser.

2. What are the benefits of using a proxy server?

First, you can use a proxy to protect your IP address. For example, when you use a proxy server to browse a website, the server does not record your real IP address, it is the proxy IP address. For some friends with low network speed, using a proxy can improve the network speed, but also can access some sites that are prohibited to access:
Let's talk about the principle of proxy. For example, if you are A server, B is A proxy server, and C is the host you want to access, but you cannot connect to the C server, however, you can quickly connect B to C, so you can connect B to C first and then B to C. In this way, we can also understand how the vro blocks our access. For example, the vro disables the connection of C but does not prohibit the connection of B, so we can access C through B!
　

Iii. What types of proxy servers are available?

GenerallyHttp,Ftp,Socks,TelnetProxy server type,Http,FtpAndTelnetThe proxy server, as its name implies, acts as a proxy for Web browsing, file transmission, and remote logon.SocksIs an irrevocable all-around proxy.--All of the preceding functions can be implemented.SocksProxy is dividedSocks4AndSocks5,Socks4The proxy only supportsTCPProtocol(Transmission Control Protocol),Socks5Proxy SupportTCPAndUDPProtocol(User Datagram Protocol)It also supports various authentication mechanisms and server-side domain name resolution.Socks4CompetentSocks5You can do it in turn, as shown inICQOnlySocks5Proxy.

Iv. Proxy Server Parameters

Generally, the information includes IP address, service port, service type, verification status, local connection time characteristics, and comments.
For example, 10.48.72.2: 80 @ HTTP $6 & 263,1987, 2543 # Harbin
10.48.72.2 indicates that the IP address of the proxy server is 10.48.72.2.
: 80 ":" indicates that the Service port of the proxy server is 80.
(Common ports include 21, 23, 80, 81, 1080, 3128, and 8080)
@ HTTP "@" indicates that the type of the proxy server is HTTP proxy.
The value after $ "indicates the proxy server verification status
$4: verifying
$5: verification timeout (the network connection is too slow. You will find it when you verify it multiple times)
$6: Free (this is what we want ^. ^)
$7: Password required
(For luck, you can use demo/demo, guest/gues, temp/temp, share/ahare, and test/test.
Try it as a password/password)
$8: non-conforming Protocol
$9: mismatch (this can happen if the proxy server is too busy)
$10: Unsupported protocols
$11: uncertain
The three values separated by "." after "&" are the three time characteristics that reflect the local connection of the proxy.
The first is the response speed, the second is the verification time, and the third is the connection time;
So of course, the smaller the value, the faster the proxy is.
# The comment proxy is Harbin (custom)