Customize settings for detecting image in url and detection by content-type
At now detecting of image in url done by searching .jpg and other text in url.
But some images have other extensions - will be good to have ability for extend list of file extensions. Some images have no extension in url, so we can't detect those images via text analysis of url.
Another way to extend detection of image is preload url and check content-type of data, if it contain image (for example Content-Type: image/jpeg) - insert image tag in chat log.