When I have a .fo document that contains a reference to an image using https, it doesn't render and I get an error in fop output. For example:
<?xml version="1.0" encoding="utf-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
<fo:layout-master-set>
<fo:simple-page-master page-width="8.5in" page-height="11in" master-name="BodyPage">
<fo:region-body margin-top=".5in" margin-right=".5in" margin-bottom=".5in" margin-left=".5in"/>
<fo:region-before region-name="header" extent=".5in" display-align="after"/>
<fo:region-after region-name="footer" extent=".5in" display-align="before"/>
</fo:simple-page-master>
</fo:layout-master-set>
<fo:page-sequence master-reference="BodyPage">
<fo:flow flow-name="xsl-region-body">
<fo:block space-before="1pc">
<fo:external-graphic src="url(https://ichef.bbci.co.uk/images/ic/960x540/p01br4cp.jpg)" overflow="hidden" content-width="scale-to-fit" content-height="scale-to-fit" width="100%" scaling="uniform"/>
</fo:block>
</fo:flow>
</fo:page-sequence>
</fo:root>
produces this error:
SEVERE: Image not found. URI: https://ichef.bbci.co.uk/images/ic/960x540/p01br4cp.jpg. (See position 13:202)
But simply modifying the url to be just http works fine. It is not a network issue as curl on the https url works just fine (via TLS 1.2). How do I get secure resources to load in my PDFs?