refactor(playback): simplify handlers, http utils, and ranking

internal/features/playback/http_utils.go

@@ -0,0 +1,25 @@
+package playback
+
+import (
+	"context"
+	"net/http"
+)
+
+func doProxiedRequest(ctx context.Context, client *http.Client, url string, referer string) (*http.Response, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("User-Agent", defaultUserAgent)
+	if referer != "" {
+		req.Header.Set("Referer", referer)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	return resp, nil
+}