Page "Project:VisualEditor_testing/Basic_example_worksheet" on mediawiki.org used to be named "VisualEditor:Basic example worksheet".
As no redirect was left, "VisualEditor:Basic_example_worksheet" no longer exists.
Opening VE there by clicking Create (https://www.mediawiki.org/w/index.php?title=VisualEditor:Basic_example_worksheet&veaction=edit) results in an error:
Error loading data from server: ve-api:
Revision IDs (doc=1751441,api=0) returned by server do not match. Would you like to retry?
This is because even though this page doesn't exist in MediaWiki, the RESTBase request is responded to with an actual revision (the last revision of that page before it was renamed, revision 1751441).
The following requests are made:
- https://www.mediawiki.org/w/api.php?action=visualeditor&format=json&paction=metadata&page=VisualEditor%3ABasic_example_worksheet&uselang=en
- oldid: 0
- https://www.mediawiki.org/api/rest_v1/page/html/VisualEditor%3ABasic_example_worksheet
<html .. revision/1751441"> <meta property="mw:TimeUuid" content="de9960d-2afc-11e5-8bd4-6a7065b61a44"/> <meta property="mw:articleNamespace" content="2500"/> <link rel="dc:replaces" resource="mwr:revision/1666615"/> <meta property="dc:modified" content="2015-07-15T14:22:00.000Z"/> <meta property="mw:revisionSHA1" content="28755873c21aaa53f9540a8819dab3881f1c4df4"/> <meta property="mw:parsoidVersion" content="0"/> <link rel="dc:isVersionOf" href="//www.mediawiki.org/wiki/VisualEditor%3ABasic_example_worksheet"/> <title>VisualEditor:Basic_example_worksheet</title> <body id="mwAA" ..> <p id="mwAQ">Some test cases for VisualEditor.</p>
- https://www.mediawiki.org/w/api.php?action=visualeditor&format=json&paction=metadata&page=VisualEditor%3ABasic_example_worksheet&uselang=en&oldid=1751441
- oldid: 0
- https://www.mediawiki.org/api/rest_v1/page/html/VisualEditor%3ABasic_example_worksheet/1751441
<html .. revision/1751441"> .. <title>VisualEditor:Basic_example_worksheet</title> <body id="mwAA" ..> <p id="mwAQ">Some test cases for VisualEditor.</p>