画像理解リクエストがタイムアウトし続ける — 画像が大きすぎますか？

import base64, io
from PIL import Image

def image_to_data_uri(path, max_side=2048, quality=85):
    img = Image.open(path)
    img = img.convert("RGB")                      # normalize to RGB; handles PNG, MPO, etc.
    img.thumbnail((max_side, max_side))           # keep aspect ratio, longer side <= max_side
    buf = io.BytesIO()
    img.save(buf, "JPEG", quality=quality)
    return "data:image/jpeg;base64," + base64.b64encode(buf.getvalue()).decode()