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, use golang.org/x/net/proxy package with Dialer. Or use the SOCKS5 port (7001) directly with a SOCKS5 dialer.
KnoxProxy has no connection limit. Use goroutines with a semaphore to control concurrency: make(chan struct{}, maxConcurrent).
Yes. Colly is a Go scraping framework that uses http.Transport under the hood. Configure the collector with c.SetProxyFunc() using your KnoxProxy URL.
Check the error from client.Do(). For retries, wrap in a loop with exponential backoff. Check resp.StatusCode for 407 (auth) or 429 (rate limit).
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