Like cookieDomain, other fields are “Create Only”:

sampleRate
siteSpeedSampleRate
allowLinker

https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference

Calls to the non-SSL Google Analytics domain incur a “307 Internal Redirect” + 2nd HTTP request penalty.

This affects also all pageviews and event tracking requests too.

i.e. Google have deprecated non-SSL calls and issue a redirect for backwards compatibility.

…le()

We’re now aligned with Google Analytics syntax too `ga('create', trackingId, fieldsObject);`.

Backward compatibility has been confirmed and new tests added.