transport should try ipv4 then ipv6 explicitly

client list panic guards and debug logging

cmd/cli/library.go

@@ -1,5 +1,12 @@
 package cli
 
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+)
+
 // AppCallback provides hooks for injecting certain functionalities
 // from mobile platforms to main ctrld cli.
 type AppCallback struct {
@@ -17,3 +24,55 @@ type AppConfig struct {
 	Verbose       int
 	LogPath       string
 }
+
+const (
+	defaultHTTPTimeout = 30 * time.Second
+	defaultMaxRetries  = 3
+)
+
+// httpClientWithFallback returns an HTTP client configured with timeout and IPv4 fallback
+func httpClientWithFallback(timeout time.Duration) *http.Client {
+	return &http.Client{
+		Timeout: timeout,
+		Transport: &http.Transport{
+			// Prefer IPv4 over IPv6
+			DialContext: (&net.Dialer{
+				Timeout:       10 * time.Second,
+				KeepAlive:     30 * time.Second,
+				FallbackDelay: 1 * time.Millisecond, // Very small delay to prefer IPv4
+			}).DialContext,
+		},
+	}
+}
+
+// doWithRetry performs an HTTP request with retries
+func doWithRetry(req *http.Request, maxRetries int) (*http.Response, error) {
+	var lastErr error
+	client := httpClientWithFallback(defaultHTTPTimeout)
+
+	for attempt := 0; attempt < maxRetries; attempt++ {
+		if attempt > 0 {
+			time.Sleep(time.Second * time.Duration(attempt+1)) // Exponential backoff
+		}
+
+		resp, err := client.Do(req)
+		if err == nil {
+			return resp, nil
+		}
+		lastErr = err
+		mainLog.Load().Debug().Err(err).
+			Str("method", req.Method).
+			Str("url", req.URL.String()).
+			Msgf("HTTP request attempt %d/%d failed", attempt+1, maxRetries)
+	}
+	return nil, fmt.Errorf("failed after %d attempts to %s %s: %v", maxRetries, req.Method, req.URL, lastErr)
+}
+
+// Helper for making GET requests with retries
+func getWithRetry(url string) (*http.Response, error) {
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+	return doWithRetry(req, defaultMaxRetries)
+}