code: def metadata(self, file_path, params=None):
          
  
          url_base = self.hs.url_base
          url = "{url_base}/resource/{pid}/files/metadata/{file_path}/".format(url_base=url_base,
                                                                              pid=self.pid,
                                                                              file_path=file_path)
  
          if params is None:
              r = self.hs._request('GET', url)
          else:
              headers = {}
              headers["Content-Type"] = "application/json"
              r = self.hs._request("PUT", url, data=json.dumps(params), headers=headers)
  
          return r
docs: :params:
              title: string
              keywords: array
              extra_metadata: array
              temporal_coverage: coverage object
              spatial_coverage: coverage object
  
          :return:
              file metadata object (200 status code)