Api call in Next JS

Question

Reading the documentation of NextJs i noticed that this framework has this feature:

function Page({ data }) {
  // Render data...
}

// This gets called on every request
export async function getServerSideProps() {
  // Fetch data from external API
  const res = await fetch(`https://.../data`)
  const data = await res.json()

  // Pass data to the page via props
  return { props: { data } }
}

export default Page

So, this getServerSideProps allows to make http requests using SSR approach.
Question: It is correct if i will say that SSR requests are available only for get requests? I say this because only this function allows us to make SSR requests and i can not imagine how to make a POST request using NEXT JS, like the user submit a form and want to send on back-end, so how in this case to use getServerSideProps? Also, it is correct that NEXTJs allows us to make SSR requests only within pages but not components?