[Bug] Unexpected return from /api/openai endpoint

I set the OpenAI Enpoint to "/api/openai" and when I start a new chat with arbitrary message, it returns html code instead of a response.

```

NextChat

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initial-scale=1\"}]]\n"])self.__next_f.push([1,"6:[[\"$\",\"meta\",\"0\",{\"charSet\":\"utf-8\"}],[\"$\",\"title\",\"1\",{\"children\":\"NextChat\"}],[\"$\",\"meta\",\"2\",{\"name\":\"description\",\"content\":\"Your personal ChatGPT Chat Bot.\"}],[\"$\",\"meta\",\"3\",{\"name\":\"theme-color\",\"media\":\"(prefers-color-scheme: light)\",\"content\":\"#fafafa\"}],[\"$\",\"meta\",\"4\",{\"name\":\"theme-color\",\"media\":\"(prefers-color-scheme: dark)\",\"content\":\"#151515\"}],[\"$\",\"meta\",\"5\",{\"name\":\"viewport\",\"content\":\"width=device-width, initial-scale=1, maximum-scale=1\"}],[\"$\",\"meta\",\"6\",{\"name\":\"apple-mobile-web-app-capable\",\"content\":\"yes\"}],[\"$\",\"meta\",\"7\",{\"name\":\"apple-mobile-web-app-title\",\"content\":\"NextChat\"}],[\"$\",\"meta\",\"8\",{\"name\":\"apple-mobile-web-app-status-bar-style\",\"content\":\"default\"}]]\n"])

```

None of the other end points I tested work, including https://gpt.nextapi.fun/api/proxy

**Deployment**
Native App: v2.10.1

**Desktop**
- OS: MacOS Sonoma 14.2.1