code: def complete_multipart_upload(self, key_name, upload_id,
                                    xml_body, headers=None):
          
          query_args = 'uploadId=%s' % upload_id
          if headers is None:
              headers = {}
          headers['Content-Type'] = 'text/xml'
          response = self.connection.make_request('POST', self.name, key_name,
                                                  query_args=query_args,
                                                  headers=headers, data=xml_body)
          contains_error = False
          body = response.read()
          # Some errors will be reported in the body of the response
          # even though the HTTP response code is 200.  This check
          # does a quick and dirty peek in the body for an error element.
          if body.find('<Error>') > 0:
              contains_error = True
          boto.log.debug(body)
          if response.status == 200 and not contains_error:
              resp = CompleteMultiPartUpload(self)
              h = handler.XmlHandler(resp, self)
              xml.sax.parseString(body, h)
              return resp
          else:
              raise self.connection.provider.storage_response_error(
                  response.status, response.reason, body)
docs: Complete a multipart upload operation.