Feed won't validate WordPress feeds containing images with srcset

[pingram3541]

I have a site where the script outputs errors stating the feed url is invalid or the feed content is not valid:

Error: Feed failed! Causes may be (1) No data found for RSS feed https://www.mywebsite.com/blog/feed; (2) There are no items are available for this feed; (3) The RSS feed does not validate.

However when I execute the script src directly in my browser it works just fine.

feed2js_ck = true;

document.write('<div class="rss-box">');
document.write('<ul class="rss-items">');
document.write('<li class="rss-item"><a class="rss-item" href="https://www.mywebsite.com/blog/families-of-criminals-reach-their-breaking-point-a-new-investigation-discovery-series-premiering-january-15" target="_self">FAMILIES OF CRIMINALS REACH THEIR BREAKING POINT - A NEW INVESTIGATION DISCOVERY SERIES PREMIERING JANUARY 15</a><br />');
document.write('</li>');
document.write('<li class="rss-item"><a class="rss-item" href="https://www.mywebsite.com/blog/lifestyle-leader-and-mindfulness-expert-is-keynote-speaker-at-long-island-womens-wellness-conference" target="_self">LIFESTYLE LEADER AND MINDFULNESS EXPERT IS KEYNOTE SPEAKER AT LONG ISLAND WOMENS WELLNESS CONFERENCE</a><br />');
document.write('</li>');
document.write('<li class="rss-item"><a class="rss-item" href="https://www.mywebsite.com/blog/lifestyle-leader-joan-moran-receives-nomination-la-business-journal-for-women-making-a-difference-award" target="_self">Lifestyle Leader Joan Moran Receives Nomination - LA Business Journal for Women Making a Difference Award</a><br />');
document.write('</li>');
document.write('<li class="rss-item"><a class="rss-item" href="https://www.mywebsite.com/blog/the-annual-socal-csp-event" target="_self">the Annual SoCal CSP Event</a><br />');
document.write('</li>');
document.write('<li class="rss-item"><a class="rss-item" href="https://www.mywebsite.com/blog/slam-dunk-delivery-with-two-nsa-members" target="_self">SLAM Dunk Delivery with Two NSA Members</a><br />');
document.write('</li>');
document.write('</ul></div>');

Any ideas?

[pingram3541]

Issue was the main site was https and blog was http.

[pingram3541]

Nope that wasn't it. Well it is but blog feed url is indeed loading http or https but fails when using https as the src attr when using this script. I should also clarify that I am using the "build" tool on the feed2js.org website. When I use a url with https, the script errors out. If I change to http it works but when loading from my website, http will always rewrite to https.