Confused about createProxySSGHelpers

If you can use this helper inside of getServerSideProps without having ssr: true what is the difference when you do enable ssr and forward headers to the server from the client?
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How to check if data is being prefetched?What is a method to check if ssg prefetching actually occurs? Through the network tab?How can I access ctx from inside of a procedure?``` const appRouter = t.router({ helloTab: t.procedure.input(z.object({ url: z.string().url() })).