Plotly.js IIS deployment - WebGL setup failed - deployment

Question

i tried to deploy my plotly application to an IIS (running under windows server 2012). Unfortunately, the graph is not shown and an error is logged out:
WARN: webgl setup failed possibly due to enabling
preserveDrawingBuffer config. The device may not be supported by
is-mobile module! Inverting preserveDrawingBuffer option in second
attempt to create webgl scene.
as I figured out using the error page, I have to add some rewrites/mime types to my web.config. But it still doesn’t work after.
My web.config looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<staticContent>
<remove fileExtension=".mem" />
<mimeMap fileExtension=".mem" mimeType="application/octet-stream" />
<remove fileExtension=".data" />
<mimeMap fileExtension=".data" mimeType="application/octet-stream" />
<remove fileExtension=".memgz" />
<mimeMap fileExtension=".memgz" mimeType="application/octet-stream" />
<remove fileExtension=".datagz" />
<mimeMap fileExtension=".datagz" mimeType="application/octet-stream" />
<remove fileExtension=".unity3dgz" />
<mimeMap fileExtension=".unity3dgz" mimeType="application/octet-stream" />
<remove fileExtension=".jsgz" />
<mimeMap fileExtension=".jsgz" mimeType="application/x-javascript; charset=UTF-8" />
</staticContent>
<rewrite>
<outboundRules>
<rule name="Append gzip Content-Encoding header">
<match serverVariable="RESPONSE_Content-Encoding" pattern=".*" />
<conditions>
<add input="{REQUEST_FILENAME}" pattern="\.unityweb$" />
</conditions>
<action type="Rewrite" value="gzip" />
</rule>
</outboundRules>
</rewrite>
</system.webServer>
</configuration>
Dou you have an idea, how to cope with this error?

Answer 1

problem was not caused by IIS (as the error misleadingly states). Error is caused by the current version of plotly, downgrading to version 1.43 fixed the issue.
Somehow the minified version of the new plotly version is not valid.