Version 5.1.1 reports plotly-latest.min.js MIME type as text/html instead of text/javascript

[mmauri]

Hi, Thank you for your work on the plotly wrapper, This is what v.4.3.0 shows (correct):

But 5.1.1 reports MIME type as text/html:

The tricky point is that if the content-security-policy is enabled, Chromium refuses to load the plotly.js:

Thanks M