Distinguish between client- and server-side call of getServerSideProps

[stigkj]

Is it possible to determine whether a call to getServerSideProps comes from the initial load of the page or from a page navigation?

We are caching client-side some parts of the data returned from getServerSideProps as it is used on all pages. Some data is different between pages, so on a page navigation we would like to return only the data specific to each page.

[claus]

This is more or less how Next does it internally:

const isClientSide = url.parse(req.url).pathname.match(/_next\/data/);