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Request URL:https://en.m.wikipedia.org/w/api.php
Request Method:POST

Form Data:
format:json
action:parse
title:Saudade
text:<ref>[http://www.priberam.pt/DLPO/default.aspx?pal=saudade Dicionário Priberam da Língua Portuguesa]</ref>
prop:text

Gives the response:
{"parse":{"title":"Saudade","text":{"*":"<p><sup id=\"cite_ref-1\" class=\"reference\"><a href=\"#cite_note-1\"><span>[</span>1<span>]</span></a></sup><br />\n<strong class=\"error\">Cite error: There are <code>&lt;ref&gt;</code> tags on this page, but the references will not show without a <code>{{Reflist}}</code> template or a <code>&lt;references /&gt;</code> tag (see the <a href=\"/wiki/Help:Cite_errors/Cite_error_refs_without_references\" title=\"Help:Cite errors/Cite error refs without references\">help page</a>).</strong></p>\n\n\n<!-- \nNewPP limit report\nPreprocessor visited node count: 134/1000000\nPreprocessor generated node count: 1529/1500000\nPost\u2010expand include size: 3063/2048000 bytes\nTemplate argument size: 1864/2048000 bytes\nHighest expansion depth: 12/40\nExpensive parser function count: 0/500\n-->\n"}}}

This should be a warning - not part of the HTML output. As an API consumer I should be able to choose how I handle errors in the parser.