Function ensureUrlProtocol

packages/core/src/utils/api.ts:247–256

(url: string)

 * "endpoint did not return JSON" error chain on connect.
 */
export function ensureUrlProtocol(url: string): string {
  const trimmed = url.trim();
  if (!trimmed) return trimmed;
  if (/^[a-z][a-z0-9+\-.]*:\/\//i.test(trimmed)) return trimmed;
  if (trimmed.startsWith("//")) return trimmed;
  const stripped = trimmed.replace(/^\/+/, "");
  const isLoopback =
    /^(localhost(?:[:/]|$)|127\.\d+\.\d+\.\d+|0\.0\.0\.0(?:[:/]|$)|\[::1?\])/i.test(stripped);
  return `${isLoopback ? "http://" : "https://"}${stripped}`;
}

function sanitizeOpenAICompatibleBaseUrl(url: string): string {
  const trimmed = trimApiUrl(url);