Making an Ajax request by leveraging the power of an image tag

I am facing a challenge with trying to establish communication on my server between port 80 and port 8080 through an ajax request. I understand the implications of CORS and the cross domain request origin policy, as well as the potential solution involving iframes as discussed here.

Out of sheer curiosity, I am intrigued to explore whether it is feasible to achieve this task. Could it be accomplished by making the requested information appear as an <img> tag with the necessary URL in the SRC attribute, then parsing the returned content from the received data?

Is such a mechanism possible? If not, what are the limitations preventing it, and if so, how could it be implemented?

Thank you!

javascriptajaxcross-domain

Answer №1

When working within the same domain, you can achieve this by utilizing a canvas element. Simply draw the image onto the canvas using canvas.drawImage, and then utilize either canvas.toDataURL or canvas.toBlob to retrieve the data from the canvas.

In scenarios involving cross-domain activity, the use of toDataURL and toBlob will be restricted if the canvas has been marked as "tainted" with a cross-domain image. To overcome this limitation, certain steps must be taken:

  1. Ensure the image is served with CORS headers,

  2. Set the crossorigin attribute of the <img> element to either "anonymous" or "use-credentials" depending on the nature of the fetch.

Answer №2

Unfortunately, no. Although there are APIs available to retrieve image data, they are typically limited to bitmaps loaded onto <canvas> rather than regular <img> elements. Additionally, the Same Origin Policy still restricts access to data from different origins.

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