Go standard library net/http with proxy support. Build high-performance concurrent scrapers with KnoxProxy and goroutines.
Parse proxy URL for http.Transport.
proxyURL, _ := url.Parse("http://USER:PASS@gw.knoxproxy.com:7000")Configure http.Transport with proxy.
transport := &http.Transport{Proxy: http.ProxyURL(proxyURL)}Attach transport to client.
client := &http.Client{Transport: transport, Timeout: 30 * time.Second}Use the proxied client.
resp, err := client.Get("https://httpbin.org/ip")Add country to username.
proxyURL, _ := url.Parse("http://USER-country-de:PASS@gw.knoxproxy.com:7000")Print exit IP.
body, _ := io.ReadAll(resp.Body)
fmt.Println(string(body))// KnoxProxy + Go -- concurrent proxy requests with goroutines.
package main
import (
"fmt"
"io"
"net/http"
"net/url"
"sync"
"time"
)
func main() {
proxyURL, _ := url.Parse("http://USER:PASS@gw.knoxproxy.com:7000")
client := &http.Client{
Transport: &http.Transport{Proxy: http.ProxyURL(proxyURL)},
Timeout: 30 * time.Second,
}
// Single request
resp, err := client.Get("https://httpbin.org/ip")
if err != nil {
panic(err)
}
body, _ := io.ReadAll(resp.Body)
resp.Body.Close()
fmt.Printf("Exit IP: %s\n", body)
// Concurrent requests with goroutines
var wg sync.WaitGroup
for i := 0; i < 10; i++ {
wg.Add(1)
go func(id int) {
defer wg.Done()
r, err := client.Get("https://httpbin.org/ip")
if err != nil {
fmt.Printf("Request %d failed: %v\n", id, err)
return
}
b, _ := io.ReadAll(r.Body)
r.Body.Close()
fmt.Printf("Request %d: %s\n", id, b)
}(i)
}
wg.Wait()
}Each HTTP request through the transport gets a new IP. For sticky sessions, include -session-{id} in the proxy username.
| Problem | Fix |
|---|---|
| proxyconnect tcp: dial tcp: connection refused | Verify host, port, and firewall rules. |
| 407 Proxy Authentication Required | Check username:password in the proxy URL. |
| context deadline exceeded | Increase client.Timeout or use context.WithTimeout with longer duration. |
USER-country-de-city-berlin-session-profile07Order matters -- geo flags before the session flag. The session name is free text; use the profile ID so the mapping is self-documenting. Password stays as issued; no flags belong there. HTTP on :7000, SOCKS5 on :7001, same credentials.
Yes, though not through the plain net/http package alone. Use the golang.org/x/net/proxy package to build a SOCKS5 Dialer, then wrap it into your http.Transport, and point it at the KnoxProxy SOCKS5 gateway on port 7001 instead of the default HTTP port 7000. Standard library HTTP proxying still works fine on the HTTP port without this extra package.
KnoxProxy places no hard limit on concurrent connections, so the practical ceiling is your own machine's file descriptors and the target site's tolerance for parallel requests. Use goroutines for concurrency, gated by a semaphore built from a buffered channel like make(chan struct{}, maxConcurrent), so you control exactly how many requests run against KnoxProxy at once.
Yes. Colly is a Go scraping framework built on top of the standard http.Transport, so it accepts the same proxy configuration as any other Go HTTP client. Configure the collector with c.SetProxyFunc(), pointing it at your KnoxProxy URL including username, password, and any -country or -session flags, and every request the collector makes routes through KnoxProxy automatically.
Always check the error returned by client.Do() first, since a nil response usually means the KnoxProxy gateway itself was unreachable. When the request does return a response, inspect resp.StatusCode for 407, which signals bad proxy credentials, or 429, which signals a rate limit, and wrap retryable calls in a loop with exponential backoff between attempts.
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