diff --git a/adafruit_portalbase/network.py b/adafruit_portalbase/network.py
index 6665de8..43ed1f8 100755
--- a/adafruit_portalbase/network.py
+++ b/adafruit_portalbase/network.py
@@ -435,6 +435,7 @@ def fetch_data(
         json_path=None,
         regexp_path=None,
         timeout=10,
+        json_content_type=None,
     ):
         """Fetch data from the specified url and perfom any parsing
 
@@ -444,7 +445,7 @@ def fetch_data(
         :param regexp_path: The path formatted as a regular expression to drill down
                             into the JSON data.
         :param int timeout: The timeout period in seconds.
-
+        :param json_content_type: A known value for content-type when JSON is returned
         """
         json_out = None
         values = []
@@ -468,6 +469,8 @@ def fetch_data(
                     content_type = CONTENT_JSON
                 elif "application/javascript" in headers["content-type"]:
                     content_type = CONTENT_JSON
+                elif json_content_type and json_content_type in headers["content-type"]:
+                    content_type = CONTENT_JSON
         else:
             if self._debug:
                 if "content-length" in headers: