Unable to connect with HTTP proxy - go

Question

go version: go1.13.5 linux/amd64
I am using "x/net/proxy" to connect with the "http_proxy".
I have referred following proxy page:
https://godoc.org/golang.org/x/net/proxy
To get proxy information I have set environment variable "all_proxy" to the the desired proxy "http://192.130.0.10:3200", and performed the tcp connection, but following error is raised:
[Network Error : socks connect tcp 192.130.0.10:3200->mx.eu1.mico.io:8883: read tcp 172.17.0.2:48118->192.130.0.10:3200: read: connection reset by peer]
I have looked "x/net/proxy", It seems "http_proxy" support is not available instead of "SOCKS5" proxy is supported. I have similar implementation for "http_proxy", but unfortunately it does not worked.
I have created a sample code (with port 1883) which is working for the non proxy environment, Please suggest how I can enable "http_proxy" or "https_proxy" support?
package main
import (
"fmt"
"os"
"golang.org/x/net/proxy"
)
//The host address which we want to connect with the proxy
var host = "google.com:80"
func main() {
fmt.Println("Inside main...")
//Setting the proxy before starting the application
if os.Getenv("http_proxy") == "" {
os.Setenv("http_proxy", "http://192.130.0.10:3200")
}
os.Setenv("all_proxy", os.Getenv("http_proxy"))
if os.Getenv("all_proxy") != os.Getenv("http_proxy") {
fmt.Println("Environment variables are not matching...")
return
}
fmt.Println("System proxy is:", os.Getenv("all_proxy"))
proxyDialer := proxy.FromEnvironment()
fmt.Println("Connecting to...", host)
conn, err := proxyDialer.Dial("tcp", host)
if err != nil {
fmt.Println("Unable to dial...", err)
return
}
fmt.Println("Connected...", conn)
}
Output:
Inside main...
System proxy is: http://192.130.0.10:3200
Connecting to... google.com:80
Unable to dial... dial tcp 172.217.23.174:80: connect: connection timed out

Answer 1

What's your purpose?
If you need to use an http-proxy server for http requests, you can just configure your http-client without another package usage:
package main
import (
"fmt"
"net/http"
"net/url"
"time"
)
func main() {
proxyUrl, err := url.Parse("http://192.130.0.10:3200")
if err != nil {
// TODO handle me
panic(err)
}
cl := http.Client{
Transport: &http.Transport{
Proxy: http.ProxyURL(proxyUrl),
},
Timeout: 3000 * time.Millisecond,
}
resp, err := cl.Get("http://google.com")
if err != nil {
// TODO handle me
panic(err)
}
// TODO work with the response
fmt.Println(resp)
}