How would I intercept all pages/images on my website?
How would I intercept all pages and images on my website to add the header on my website?

For example, if somebody went to "www.bla.com/submit.png" it would include my header, and the image.
How would I intercept all pages/images on my website?
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How would I intercept all pages and images on my website to add the header on my website?

For example, if somebody went to "www.bla.com/submit.png" it would include my header, and the image.