I am seeing the following warnings server-side. I believe these are resulting in some 5XX errors going out in Nginx. Based on the warning, I would guess that the plugin is not set to handle drafts with empty post content…?
2016/10/20 16:27:17 [error] 1069#0: *240477 FastCGI sent in stderr: “PHP message: PHP Warning: DOMDocument::loadHTML(): Empty string supplied as input in /XXXXXX/wp-content/plugins/fb-instant-articles/vendor/facebook/facebook-instant-articles-sdk-php/src/Facebook/InstantArticles/Transformer/Transformer.php on line 178” while reading response header from upstream, client: 172.31.46.188, server: localhost, request: “POST /wp-admin/admin-ajax.php HTTP/1.1”, upstream: “fastcgi://unix:/var/run/php5-fpm.sock:”, host: “XXXXXX”, referrer: “http://XXXXXX/wp-admin/post-new.php”
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