How to use proxies with Colly

Which proxy works best with Colly?

For most scraping, Residential Lite is the cheapest way to get home IP addresses in the right country. Use Residential when you need a particular state or city, and Unlimited Datacenter for targets in the United States that do not block data centre addresses.

• Residentialfrom $3.52 per GB
• Residential Litefrom $0.96 per GB
• Unlimited Datacenterfrom $0.56 per hour

Proxy settings for Colly: host, port and login

A BooProxies plan gives you four things: a host, a port, a username and a password. These are the values for Residential; the username and password are on your plan page.

As one address:

http://USERNAME:PASSWORD@resi.proxies.boo:8080

The country and the session are chosen in the username, not in a separate setting. The generator on your plan page writes the username for you, and Targeting and sessions explains each part.

Colly proxy setup, step by step

1. Call SetProxy on the collector with the proxy address.
2. To rotate between fixed sessions, use proxy.RoundRobinProxySwitcher with several addresses that differ in session ID.

Colly proxy example

Go

package main

import (
	"fmt"

	"github.com/gocolly/colly/v2"
)

func main() {
	c := colly.NewCollector()
	c.SetProxy("http://USERNAME:PASSWORD@resi.proxies.boo:8080")
	c.OnResponse(func(r *colly.Response) { fmt.Println(string(r.Body)) })
	c.Visit("https://api.ipify.org")
}

Replace USERNAME and PASSWORD with the login from your plan page. The example asks an IP-check address, so the output is the address your request left from.

Rotating or sticky sessions for Colly?

For crawling many pages with Colly, leave the username without a session so every request leaves from a new IP address. For anything with steps that belong together, such as a login, a cart or a paginated search that sets cookies, add a session to the username so those requests share one address.

A sticky username looks like this:

USERNAME-country-us-time-600-session-a1b2c3d4

Colly proxy not working?

• With a rotating username you do not need the switcher at all: one address already gives a new IP per connection.
• A 407 error means the username or password was not accepted. Copy both again from your plan page, and check that nothing added a space or cut the username short.
• If the IP address is in the wrong country, look at the username: the country code is part of it. More fixes.

Questions about Colly and proxies

Terms explained: web scraping, rotating proxy, sticky session, rate limiting, headless browser.

Colly is a product of its own makers. BooProxies is not affiliated with it; the name is used here only to say what this guide is about. Use it within the rules of the sites you work with and our acceptable use policy.