Add a 5s timeout to the download request.

Author: theengineear

plotly/graph_reference.py

@@ -15,6 +15,7 @@
 from plotly import exceptions, files, utils
 
 GRAPH_REFERENCE_PATH = '/v2/plot-schema'
+GRAPH_REFERENCE_DOWNLOAD_TIMEOUT = 5  # seconds
 
 
 def get_graph_reference():
@@ -43,7 +44,8 @@ def get_graph_reference():
                                                 GRAPH_REFERENCE_PATH, sha1)
 
     try:
-        response = requests.get(graph_reference_url)
+        response = requests.get(graph_reference_url,
+                                timeout=GRAPH_REFERENCE_DOWNLOAD_TIMEOUT)
         response.raise_for_status()
     except requests.exceptions.RequestException:
         if not graph_reference: