G'day djlerman,
I ran a few tests:
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Your HTML (<html>...</html>) by itself renders with an image.
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Your code, as written, generates PDF without an image: I tried with both piping to xpdf and redirecting to a file and opening that file with two different PDF viewers.
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I saved the image (from the base64 data) generated in the pure HTML test as a JPEG file and used that filename in the src attribute in your code: the generated PDF still had no image.
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I also tried replacing the to_string() method with the to_file() method: again, PDF had no image.
There are 22 new/open bugs (raised at various times over the last decade): Active bugs for HTML-HTMLDoc.
The current version (0.10) was written 9 years ago.
There was a developer release (0.11_01) 5 years ago.
Here's a list of releases.
Maintainance of this module appears to have been abandoned.
The author didn't even reply to this (from 5 years ago): Bug #47649 for HTML-HTMLDoc: Question about maintenance for HTML::HTMLDoc.
You can raise a bug report but I wouldn't hold my breath waiting for a fix.
In your situation, I'd probably be looking for an alternative solution that didn't involve this module.
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