docs: def with_body(self, body):
          # @todo take encoding into account
          """Sets the request body to the provided value and returns the request itself.
  
          Keyword arguments:
          body -- A UTF-8 string or bytes-like object which represents the request body.
          """
          try:
              self.body = body.encode('utf-8')
          except:
              try:
                  self.body = bytes(body)
              except:
                  raise ValueError("Request body must be a string or bytes-like object.")
          hasher = hashlib.sha256()
          hasher.update(self.body)
          digest = base64.b64encode(hasher.digest()).decode('utf-8')
          self.with_header("X-Authorization-Content-Sha256", digest)
          return self