fix: compatibility with experiments.buildHttp

[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?

No need, existing tests

Motivation / Use-Case

fixes webpack/webpack#16091

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Base: 90.48% // Head: 92.00% // Increases project coverage by +1.51% 🎉

Coverage data is based on head (a250a69) compared to base (87c08f1).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4585      +/-   ##
==========================================
+ Coverage   90.48%   92.00%   +1.51%     
==========================================
  Files          16       16              
  Lines        1639     1650      +11     
  Branches      617      621       +4     
==========================================
+ Hits         1483     1518      +35     
+ Misses        142      121      -21     
+ Partials       14       11       -3     

Impacted Files	Coverage Δ
lib/Server.js	93.64% <85.71%> (+2.02%)	⬆️

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