Data URIs are useful for embedding resources in a page (e.g. a single HTML file containing all of its own CSS, JS, images, etc.)
This is different: it's a single file which can be parsed as either a HTML page or a JPEG. Hence, when a program expects a HTML page (like a browser loading a Web page), it will be parsed and displayed as a HTML page. When a program expects a JPEG file (like a browser loading the "src" of an "img" element) it will be parsed and displayed as a JPEG.
The trick is to use each format's comment syntax to hide the other format. Not sure if the HTTP headers need to be set differently for each request or not.
This is different: it's a single file which can be parsed as either a HTML page or a JPEG. Hence, when a program expects a HTML page (like a browser loading a Web page), it will be parsed and displayed as a HTML page. When a program expects a JPEG file (like a browser loading the "src" of an "img" element) it will be parsed and displayed as a JPEG.
The trick is to use each format's comment syntax to hide the other format. Not sure if the HTTP headers need to be set differently for each request or not.