From 3c52f5339178569f61f531fff4548d22b20daeb1 Mon Sep 17 00:00:00 2001
From: Matthew Horton <mkhorton@users.noreply.github.com>
Date: Tue, 26 Mar 2019 14:16:36 -0700
Subject: [PATCH] Update MPRester to warn if a non-standard endpoint is used

---
 pymatgen/ext/matproj.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pymatgen/ext/matproj.py b/pymatgen/ext/matproj.py
index 380d31b1a3c..900ec8ac8d0 100644
--- a/pymatgen/ext/matproj.py
+++ b/pymatgen/ext/matproj.py
@@ -104,6 +104,10 @@ def __init__(self, api_key=None, endpoint=None):
         else:
             self.preamble = SETTINGS.get("PMG_MAPI_ENDPOINT",
                                          "https://materialsproject.org/rest/v2")
+
+        if self.preamble != "https://materialsproject.org/rest/v2":
+            warnings.warn("Non-default endpoint used: {}".format(self.preamble))
+
         import requests
         if sys.version_info[0] < 3:
             try: