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Auth fail on image stream when generating PDF’s with PHP
The error:PHP Warning: failed to open stream: HTTP request failed! HTTP/1.1 401 Unauthorized
…and you either get blanks where there should be images in your PDF, or you get no PDF at all. I encountered this problem while using wp-post-to-pdf-enhanced and Kalin’s PDF Creation Station for WordPress.
The methods throwing the warning:
getimagesize()
imagecreatefromjpeg()
The cause:
This appears to happen under 2 conditions: Apache authentication is required on the directory, AND the path to the image file contains directories named with numbers.
The fix:
You need to change just one of these conditions for it to work. Either rename the image directories to NOT begin with numbers, OR remove the apache authentication.