fix: security problem with sockjs

[alexander-akait]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Existing

Motivation / Use-Case

Allow to setup https://github.com/nfriedly/express-rate-limit package (and other) to prevent a denial of service attack, We don't setup rate limits by default, because we are a development server and this is not applicable for us, but you can setup rate limit middleware using https://webpack.js.org/configuration/dev-server/#devserversetupmiddlewares

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #4482 (587baf8) into master (90488f1) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4482      +/-   ##
==========================================
- Coverage   92.19%   92.18%   -0.01%     
==========================================
  Files          16       16              
  Lines        1601     1600       -1     
  Branches      604      604              
==========================================
- Hits         1476     1475       -1     
  Misses        114      114              
  Partials       11       11              

Impacted Files	Coverage Δ
lib/Server.js	93.65% <100.00%> (-0.01%)	⬇️

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