<div id="dynamic-viewer"> <iframe id="content-frame" src="about:blank" allowfullscreen></iframe> </div>

Unlike modern cameras that utilize encrypted HTTPS protocols and complex authentication tokens, early IP cameras often utilized HTTP on port 80. Many generic cameras relied on a CGI (Common Gateway Interface) script named viewerframe to serve video content.

The "ViewerFrame" part of the link is a specific page or directory within that web server’s file structure. The "Mode" parameter tells the server how to deliver the video. Common modes include:

Because ViewerFrame mode links accept external link parameters, they can be abused for open redirects or XSS attacks if improperly sanitized.