For example:
"mainpage" field is omitted when querying Barack Obama https://en.wikipedia.org/wiki/Special:ApiSandbox#action=mobileview&format=json&page=Barack_Obama&prop=pageprops&pageprops=mainpage :
{ "mobileview": { "pageprops": [], "sections": [] } }
But, it's present when querying Main Page https://en.wikipedia.org/wiki/Special:ApiSandbox#action=mobileview&format=json&page=Main_Page&prop=pageprops&pageprops=mainpage :
{ "mobileview": { "pageprops": [], "mainpage": "", "sections": [ ... ]
}
}
Is this the desired behavior?