tested: XMM URLs are head-safe (they give the data size in the header)

Author: keflavich

astroquery/esa/xmm_newton/core.py

@@ -122,7 +122,7 @@ def download_data(self, observation_id, *, filename=None, verbose=False,
 
         filename += "".join(suffixes)
 
-        self._download_file(link, filename)
+        self._download_file(link, filename, head_safe=True)
 
         if verbose:
             log.info("Wrote {0} to {1}".format(link, filename))