implementation of getServerSideProps in pages/xyz.js files

index.js

export async function getServerSideProps(context) {
    const session = await getSession(context)
    const client = initializeApollo({})
    //await getDataFromTree(Index) replaced by manual client.query calls
    const cpl = await client.query({
        query: ComplaintsQuery, context: {
            headers: {'infra-token': session?.infraToken}
        }
    })
//...
    return {props: {session, ...(documentProps.props), fullUrl}}
}