As an Internet worker, it is inevitable that you will encounter such problems in your work: IP addresses are blocked due to too many posts; insufficient number of votes to participate in activities, and no good rankings; many accounts need to be registered, but the website only allows one IP Register an account; crawl the website information, and only crawl a few IPs, and then you will be restricted access...These situations require the use of proxy IPs. Today, Tianqi IP will take you to find out~
1. Some common functions of proxy IP
1. Break through your own IP access restrictions. Many websites now restrict access to IP addresses. At this time, you can use proxy IP to break through the restrictions and allow yourself to enter the website.
2. Improve access speed. Usually the proxy IP server sets a larger hard disk buffer. When there is external information, the information is directly taken out of the buffer and passed to the user to improve the access speed.
3. Hide the real IP to achieve anonymity, you can go online through the proxy IP and hide the real IP address.
4. Break through IP blocking, for example, to capture data from a website, but the website limits the data that can be captured by each IP. At this time, we use the proxy IP and constantly switch the IP to break through the restriction, thus Improve work efficiency.
2. Four methods for the system to identify proxy IP
Reverse detection technology: scan the IP to see if the ports that are often opened by proxy servers such as 80 and 8080 have been opened. Obviously, an ordinary user IP is unlikely to open the above ports;
X_Forward_For in the HTTP header: The IP with HTTP proxy enabled can be used to identify whether it is a proxy or not. If it contains XFF information, it means that the IP is a proxy IP.
Keep-alive message: If there is a Keep-alive message with Proxy-Connection, there is no doubt that the IP is a proxy IP;
Check the port on the IP: If some port in an IP is greater than 10000, then most of the IP also has problems.
3. How to quickly determine whether the proxy IP is available
Enter telnet XXX.XX.XX.XXX XX under the command line
即 telnet IP address port
For example: telnet 213.197.81.50 3128
If it is connected, it is valid
In addition, you can also use online POST tools to detect