Full measure static caching - Don't cache pages where content type is not text/html

[jasonvarga]

Bug Description

If you cache an xml page, the first request would be served as xml, but then the html file would be served as html which is incorrect.

Extra Detail

See #2259

[github-actions]

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[SenseAndImage]

I am reviving this. Currently static cache only servers HTML files. That is ugly when trying to use static caching for non-html files. For example JSON works when trying to access it via an SPA, however sitemap.xml does not work, since the xml file is not present at all.

I would prefer if statamic respects the mime type in e.g. routes/web.php

Tee following does not work when static caching is enabled (or has to be excluded from static_caching.php):

// The Sitemap route to the sitemap.xml
Route::statamic('/sitemap.xml', 'sitemap/sitemap', [
    'layout' => null,
    'content_type' => 'text/xml'
]);

[duncanmcclean]

@SenseAndImage Could you open a new issue for that please?