Wrong version number-error with plotly-extension install

[Khris777]

Hi.

While trying to install the plotly-extension I'm constantly getting this error:

npm ERR! request to https://registry.npmjs.org/@jupyterlab%2fplotly-extension failed, reason: write EPROTO 14104:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:openssl\ssl\record\ssl3_record.c:252:

Full error log:

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'pack',
1 verbose cli   '@jupyterlab/plotly-extension' ]
2 info using npm@6.4.1
3 info using node@v10.15.0
4 verbose npm-session 93883b3a99b6d833
5 silly fetchPackageMetaData error for @jupyterlab/plotly-extension request to https://registry.npmjs.org/@jupyterlab%2fplotly-extension failed, reason: write EPROTO 14104:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:openssl\ssl\record\ssl3_record.c:252:
6 verbose type system
7 verbose stack FetchError: request to https://registry.npmjs.org/@jupyterlab%2fplotly-extension failed, reason: write EPROTO 14104:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:openssl\ssl\record\ssl3_record.c:252:
7 verbose stack
7 verbose stack     at ClientRequest.req.on.err (C:\Program Files\nodejs\node_modules\npm\node_modules\node-fetch-npm\src\index.js:68:14)
7 verbose stack     at ClientRequest.emit (events.js:182:13)
7 verbose stack     at onerror (C:\Program Files\nodejs\node_modules\npm\node_modules\agent-base\index.js:100:9)
7 verbose stack     at callbackError (C:\Program Files\nodejs\node_modules\npm\node_modules\agent-base\index.js:122:5)
7 verbose stack     at process._tickCallback (internal/process/next_tick.js:68:7)
8 verbose cwd C:\Users\...\AppData\Local\Temp\tmp6a_cd08f
9 verbose Windows_NT 10.0.17763
10 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "pack" "@jupyterlab/plotly-extension"
11 verbose node v10.15.0
12 verbose npm  v6.4.1
13 error code EPROTO
14 error errno EPROTO
15 error request to https://registry.npmjs.org/@jupyterlab%2fplotly-extension failed, reason: write EPROTO 14104:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:openssl\ssl\record\ssl3_record.c:252:
16 verbose exit [ 1, true ]

I'm behind a company proxy and I did configure my proxy settings in .npmrc.

Versions:

Python 3.6.6
Plotly 3.4.2
Jupyterlab 0.35.4
Windows 10 64bit
Firefox 64.0.2
nodejs 10.15.0