Scraping With Golang And Proxy Authentication Why use Gloang for...
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Golang provides one of the fastest frameworks for scraping web content.
Go offers a wide selection of frameworks. Some are simple packages with core functionality, while others, such as Ferret, Gocrawl, Soup, and Hakrawler, offer a advanced web scraping architecture to simplify data extraction.
The most popular framework for writing web scrapers in Go is Colly.
With Colly you can easily extract structured data from websites, which can be used for a wide range of applications, like data mining, data processing, web site application testing or archiving.
Colly Features:
Colly has a clean API, handles cookies and sessions automatically, supports caching and robots.txt, and most importantly, it’s fast. Colly offers distributed scraping, HTTP request delays, and concurrency per domain.
Colly uses Golang’s default http client as networking layer. HTTP options can be tweaked by changing the default HTTP roundtripper.
c := colly.NewCollector()
c.WithTransport(&http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
roundRobinSwitcher, err := collyProxy.RoundRobinProxySwitcher("socks5://username:password@127.0.0.1:9000")
And the HTTP package will add auth header for you automatically:
(https://github.com/golang/go/blob/master/src/net/http/transport.go#L1624)
case cm.proxyURL.Scheme == "socks5":
conn := pconn.conn
d := socksNewDialer("tcp", conn.RemoteAddr().String())
if u := cm.proxyURL.User; u != nil {
auth := &socksUsernamePassword{
Username: u.Username(),
}
auth.Password, _ = u.Password()
d.AuthMethods = []socksAuthMethod{
socksAuthMethodNotRequired,
socksAuthMethodUsernamePassword,
}
d.Authenticate = auth.Authenticate
}
if _, err := d.DialWithConn(ctx, conn, "tcp", cm.targetAddr); err != nil {
conn.Close()
return nil, err
}
This method can be used if you want to force your user to specify their proxy server address and port number, and type their username and password into your application, and your application to store it somewhere (either in the clear or using necessarily reversible encryption)
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