D2 Third party nodes do not appear - blocked due to forbidden MIME („text/html”)

Dashboard
1

A user has reported an issue against my gauge-classic node, but in fact it appears that he/she sees the same problem with other third party ui nodes. In the browser tools he sees

/resources/@colinl/node-red-dashboard-2-ui-gauge-classic/ui-gauge-classic.umd.js” zostało zablokowane z powodu niedozwolonego typu MIME („text/html”).

"blocked due to forbidden MIME („text/html”)."

Can anyone throw any light on this? Since the problem is not specific to the gauge node I suggest we have the discussion here rather than on the issue on github.

2

This can be caused by several things but it is generally because the Express server has no-discover mimetypes turned on and then the links in the HTML are not identifying things correctly.

So I think maybe start by checking the HTML that is being delivered?

3

It must be something to do with this user's setup, as this is the first time the problem has been seen as far as I know.

4

The only thing I can think of is a NR server restart - how are they running Node-RED?

5

The problem mentioned by the OP was originally reported by me. Node-red is installed via docker. The problem occurs in both NR 3.11.1 and 4.0.0 . Flowfuse dashboard 2.0 1.11.1 installed normally from the palette. I just noticed that the problem occurs only when the dashboard is behind nginx reverse proxy. When opening directly everything is ok.

6

This is very useful detail, thanks. I think @hardillb reported some similar issues to this recently as well actually. I'm guessing we have a hardcoded path that isn't proxy-friendly - will investigate.

1 Like
7

I see that Joe has opened an issue to track this. Third-party nodes not loading when Dashboard hosted on proxy · Issue #1024 · FlowFuse/node-red-dashboard · GitHub

2 Likes
8

I have most of my node-red sites behind a nginx-reverse-proxy, and the third party widgets are loading fine (ui-iframe; ui-led; ui-gauge-classic).

So it can be related with the addition of docker.

1 Like