v5.0.67: fix proxy nil crash + net/url import

universal_rebuild/internal/provider/provider.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
 	"strings"
 	"time"
@@ -137,7 +138,7 @@ func (p *NubesProvider) Configure(ctx context.Context, req provider.ConfigureReq
 		proxyFunc := transport.Proxy
 		target := addr
 		if proxyFunc != nil {
-			proxy, err := proxyFunc(nil)
+			proxy, err := proxyFunc(&http.Request{URL: &url.URL{Scheme: "https", Host: target}})
 			if err == nil && proxy != nil {
 				conn, err := dialer.DialContext(ctx, "tcp", proxy.Host)
 				if err != nil {