dl_files: use openurl in place of requests.head.

Author: Benjamin Moody

wfdb/io/download.py

@@ -526,8 +526,7 @@ def dl_files(db, dl_dir, files, keep_subdirs=True, overwrite=False):
     db_url = posixpath.join(PN_CONTENT_URL, db_dir) + '/'
 
     # Check if the database is valid
-    response = requests.head(db_url)
-    response.raise_for_status()
+    _url.openurl(db_url, check_access=True)
 
     # Construct the urls to download
     dl_inputs = [(os.path.split(file)[1], os.path.split(file)[0], db_dir, dl_dir, keep_subdirs, overwrite) for file in files]