Golang Crawler: Go Language Crawler

Golang crawler with a "face mask".

Do web crawler brothers understand, now the site's anti-climbing measures than the neighborhood gated. A few days ago with Go wrote a collection tool, just run half an hour on the 403 gift package received - IP was pulled black. At this time, we need a proxy IP to act as a "stand-in actor", so that the crawler can change a vest to continue to work.

The proxy IP thing is like the uniform of a courier boy, wearing it to blend into different neighborhoods. However, the proxy services on the market are uneven, and some of them will fall off after using them. Here we must favoripipgo家的动态住宅代理，实测稳定性比那些节点靠谱多了，特别是他们的智能轮换机制，能自动切换IP避免触发风控。

Hands on with playing proxies in Go!

Client comes with http.Client support for proxy setup, so it's nice to not have to install third-party libraries. The core code is just three lines, but there are a few pitfalls to be aware of:

func createClient(proxyURL string) http.Client {
    transport := &http.Transport {
        Proxy: http.ProxyURL(parseProxy(proxyURL)), // key configuration points
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // skip certificate verification
    }
    return &http.Client{Transport: transport}
}

Here's a tasty maneuver: write the proxy address as"username:password@ip:port"format, such asuser123:pass456@gateway.ipipgo.net:9021The backend of ipipgo automatically assigns the optimal line, which saves you a lot of work compared to manually switching it yourself.

What about the "shift system" in the agency pool?

If you use a single proxy for a long time, it will still be blocked, so you need to set up an IP pool for them to stand guard in shifts. Recommendedredis+Timerof the program:

The real-world program can spike the success rate from 37% to 89%, especially with ipipgo'squantity-based billing model, costing half as much as buying a fixed IP package.

A must-see guide to avoiding the pitfalls for beginners

Q: Why do I still get blocked after using a proxy?
A: 80% of the headers are not camouflaged in place, remember to bring User-Agent and Referer. ipipgo background has a ready-made header template can be directly copied homework

Q: What should I do if the proxy IP latency is high?
A: Add a speed measurement logic in the code to prioritize nodes with response speeds <800ms. ipipgo nodes come with latency tags that can be filtered directly

Q: What if I need to deal with CAPTCHA?
A: Don't get tough, get on ipipgo'sHigh Stash Residential Agency. These types of IPs have a low probability of being flagged, and with random click track simulation, they can basically bypass the CAPTCHA

Troublesome maneuvers in the real world

Recently, I found a great trick: binding proxy IPs to browser fingerprints. With go-rod and other headless browser libraries, each IP with a separate browser fingerprint, the site is more difficult to identify the crawler. The code looks like this:

browser := rod.New().Proxy("socks5://ipipgo_001:password@gateway.ipipgo.net:9050")
defer browser.Close()
page := browser.MustPage("https://target.com")
// Set the independent fingerprint parameter
page.SetUserAgent("Mac OS X/ Safari 15.0")
page.SetViewport(1920, 1080, 1, false)

This combination of punches out, the target site basically take you as a normal user in the slipstream. ipipgo's technical customer service also taught a trick: the request is dispersed to different geographic export nodes, can effectively reduce the density of single-IP requests.

How much should I spend so that I don't lose out?

Proxy services are not the more expensive the better, it depends on the business scenario. Make a comparison table for newbies:

At first it is recommended to start with ipipgo'sFree Trial PackageThe 500 requests per day are enough to test the basic functions. When you run smoothly before upgrading, do not come up to buy the most expensive package as a wrongdoer.