Introduction
Some time ago at work, I was tasked with loading an image from S3 to render it onto a canvas. However, a CORS error popped up, causing the image to not display. After a long debugging journey, I finally solved the issue and wrote an article about it on Medium. When I was about to copy that article here, I stumbled upon Huli’s excellent CORS Complete Guide, and realized my knowledge of CORS was pretty shallow. After digesting more information and doing extra research, I decided to rewrite and supplement my original content to make it more complete.
If you want the best CORS tutorial, please refer to Huli’s articles. This post will focus on the topic discussed in Part 6 of the series: CORS Issues That May Not Be CORS Issues”.