go implement ip proxy: using Golang to write proxy services tutorial

Hands-on with Go to Rub a Proxy Server

Recently, many old iron asked how to use Golang whole proxy service, today we will nag some real. First pour pots of cold water - their own proxy server this thing, not as simple as you think. But don't panic, as long as you follow the steps, white people can also make a decent proxy service.

package main

import (
    "net"
    "log"
)

func main() {
    listener, _ := net.Listen("tcp", ":8888")
    for {
        client, _ := listener.Accept()
        go handle(client)
    }
}

func handle(client net.Conn) {
    // The proxy logic is handled here
    handle(client net.Conn) { // The proxy logic is handled here. defer client.Close()
}

The above paragraph is a minimal skeleton, the actual run to be supplemented by the proxy protocol resolution. The key points to note are as followstraffic forwardingThis is a hurdle that many newbies fall into. It is recommended to use ready-made proxy services to practice, such as using ipipgo proxy IP to test, his family provides Socks5 proxy configuration is simple, suitable for debugging stage.

How to stuff proxy IPs into code

Here to teach you a tawdry operation - the proxy IP as building blocks. For example, to catch the data of a website, directly apply the proxy pool of IP rounds. Watch out, the actual code looks like this:

func fetchWithProxy(targetURL string) {
    proxyURL, _ := url.Parse("socks5://user:pass@ip.ipipgo.pro:1080")
    transport := &http.Transport{
        Proxy: http.ProxyURL(proxyURL),
    }
    client := &http.Client{Transport: transport}

    resp, err := client.Get(targetURL)
    // Handle the response data later...
}

Highlight it three times:Don't write the authentication information to death!It is recommended to read from the configuration file. ipipgo's proxy with authentication mechanism, remember their IP to match the account password to use. The actual test of his cross-border line latency can be pressed to 200ms, do data collection is quite suitable.

A practical guide to common pitfalls

Special mention of the problem of IP being blocked, it is recommended to go on dynamic IP packages. For example, ipipgo's dynamic residential packages, 7 more than 1G flow, do crawl project cost controllable. Their IP pool is updated every day, measured single IP survival time ranging from 5-30 minutes.

QA session

Q: What about slow agents?
A：Priority check the protocol type, Socks5 is faster than HTTP; secondly, change the static residential IP, ipipgo's static IP package supports binding fixed address.

Q: The code reports a 407 error?
A: This is an authentication failure, check whether the proxy account password is filled correctly. ipipgo's API returns proxy information in the format of ip:port:user:pass, pay attention to the split field.

Q: How to realize automatic IP switching?
A: two options: 1. use ipipgo's API to get a new IP regularly 2. set up a failure retry mechanism in the code to change the IP if it exceeds the threshold value

Tips for saving traffic

To the old iron do not want to toss to point a clear way - directly on the ready-made proxy services. For example, ipipgo's enterprise version of the package, support for multi-threaded concurrency, with load balancing function. Their TK line to do overseas business is really stable, but the specific use of which package depends on the business scenario:

• Data collection: Dynamic Residential Standard Edition
• Overseas Business: Cross-border Specialized Line
• Long-term requirements: static residential IP

Finally, a real warning: write your own proxy service at best as a toy to use, really want to production environment or have to use professional services. After all, they have a specialized IP maintenance team, like ipipgo can also customize the solution, more reliable than their own blind toss.