imgspy finds the metadata (type, size) of an image given its url by fetching as little as needed. This is a python implementation of fastimage. Supports image types BMP, CUR, GIF, ICO, JPEG, PNG, PSD, TIFF, WEBP.
>>> imgspy.info('http://via.placeholder.com/1920x1080')
{'type': 'png', 'width': 1920, 'height': 1080}
>>> with requests.get('http://via.placeholder.com/1920x1080', stream=True) as res:
... imgspy.info(res.raw)
{'type': 'png', 'width': 1920, 'height': 1080}
>>> imgspy.info('/path/to/image.jpg')
{'type': 'jpg', 'width': 420, 'height': 240}
>>> with open('/path/to/image.jpg') as f:
... imgspy.info(f)
{'type': 'jpg', 'width': 420, 'height': 240}
