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npm ERR! 403 MediaTypeBlocked: bootstrap@4.0.0-beta.2

What I Wanted to Do

I wanted to compile angular-split-website-src.

What Happened Instead

npm ERR! 403 MediaTypeBlocked: bootstrap@4.0.0-beta.2

Reproduction Steps

I downloaded angular-split-website-src, unzipped it, and ran npm install


2018-10-22T07_48_35_107Z-debug.log (182.2 KB)

Platform Info

$ npm --versions
{ npm: '6.4.1',
  ares: '1.10.1-DEV',
  cldr: '32.0',
  http_parser: '2.8.0',
  icu: '60.1',
  modules: '57',
  napi: '3',
  nghttp2: '1.32.0',
  node: '8.12.0',
  openssl: '1.0.2p',
  tz: '2017c',
  unicode: '10.0',
  uv: '1.19.2',
  v8: '6.2.414.66',
  zlib: '1.2.11' }
$ node -p process.platform

(post withdrawn by author, will be automatically deleted in 24 hours unless flagged)

As you can see from the log, it was able to load until zone.js. If failed upon loading opn@4.0.2. Why is opn blocked? Beeing a Nodejs package, it should have only Javascript files.

I’m unable to reproduce this (opn downloads and installs just fine for me). Is it possible that you’re using a corporate proxy that’s doing the blocking? I would note that it includes a rather large shell script, in addition to the JS.

Yes, when I try to download the opn zip file from github (, I get the following error:

File Blocked

McAfee Web Gateway has blocked the file, because the detected media type (see below) is not allowed.

Filename: opn-master/xdg-open
Media Type (detected): application/x-sh, text/plain
Media Type (from file name):
Transaction ID: 2RfjtX8NckzXyi+WNwZD+/qOiMHdTn86e1QCdP41HoZY/wQ3Bi2xwJU9q47ekwa0wYINdA2QC+dPajS6UGDMMg==
This message was generated by webwash3

generated 2018-10-25 10:26:11 by McAfee Web Gateway

It seems that the coporate proxy blocks shell scripts.