error message that catches responses with HTTP and not HTTPS

Author: Kully

plotly/api/v2/utils.py

@@ -8,6 +8,37 @@
 from plotly.api.utils import basic_auth
 
 
+HTTP_ERROR_MESSAGE = (
+    """Your plotly_domain and plotly_api_domain must be HTTPS and not HTTP.\n
+    If you are not using On-Prem then run the following code to ensure your
+    plotly_domain and plotly_api_domain start with 'https':
+
+    ```
+    import plotly
+    plotly.tools.set_config_file(
+        plotly_domain='https://plot.ly',
+        plotly_api_domain='https://api.plot.ly'
+    )
+    ```
+
+    If you are using On-Prem then you will need to use your company's
+    domain and api_domain urls:
+
+    ```
+    import plotly
+    plotly.tools.set_config_file(
+        plotly_domain='https://plotly.your-company.com',
+        plotly_api_domain='https://plotly.your-company.com'
+    )
+    ```
+
+    Make sure to replace "your-company.com" with the URL of your Plotly On-Premise server.
+
+    See https://plot.ly/python/getting-started/#special-instructions-for-plotly-onpremise-users
+    for more tips for getting started with Plotly."""
+)
+
+
 def make_params(**kwargs):
     """
     Helper to create a params dict, skipping undefined entries.
@@ -76,6 +107,10 @@ def validate_response(response):
     if not message:
         message = content if content else 'No Content'
 
+    if not response.history[0].url.startswith('https:'):
+        raise exceptions.PlotlyRequestError(HTTP_ERROR_MESSAGE,
+                                            status_code, content)
+
     raise exceptions.PlotlyRequestError(message, status_code, content)