How to Use Proxies with UTLS and HTTP 1.1 Requests?

Use Proxies with UTLS and HTTP 1.1 Requests

Question:

How do you connect to a host using UTLS with a randomized TLS fingerprint while utilizing an HTTP or SOCKS5 proxy?

Answer:

To use proxies with UTLS and HTTP 1.1 requests, you can follow these steps:

1. Create a Proxy Dialer:

First, create a proxy dialer that will dial the proxy and return a net.Conn. Here's a simplified example:

import (
    "net/url"
    "github.com/magisterquis/connectproxy"
    "golang.org/x/net/proxy"
)

var proxyString = "http://127.0.0.1:8080"

dialTLS := func(network, addr string, _ *tls.Config) (net.Conn, error) {
    proxyURI, _ := url.Parse(proxyString)

    var proxyDialer proxy.Dialer
    switch proxyURI.Scheme {
    case "socks5":
        proxyDialer, _ = proxy.SOCKS5("tcp", proxyString, nil, proxy.Direct)
    case "http":
        proxyDialer, _ = connectproxy.New(proxyURI, proxy.Direct)
    }

    return proxyDialer.Dial("tcp", addr)
}

2. Dial the Proxy and Create a UTLS Client:

Once you have a proxy dialer, dial the proxy to create a net.Conn. Then, use that net.Conn when creating the UTLS Client, before handshaking. For example:

import (
    "github.com/refraction-networking/utls"
)

uconn := utls.UClient(conn, cfg, &utls.HelloRandomizedALPN)

3. Send HTTP Request over UTLS Connection:

Finally, you can use the UTLS connection to send an HTTP 1.1 request. Here's how you can do it:

req := &http.Request{
    Method: "GET",
    URL:    &url.URL{Host: "www.example.com", Path: "/"},
    Header: make(http.Header),
}

req.Proto = "HTTP/1.1"
req.ProtoMajor = 1
req.ProtoMinor = 1

if err := req.Write(uconn); err != nil {
    return nil, err
}

Additional Tips:

• Consider using the "connectproxy" module for HTTP CONNECT proxies.
• Explore the Meek pluggable transport source for Tor, which simplifies proxy handling for UTLS and HTTP 1.1 requests.

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