feat: allow array for headers option

[snitin315]

• 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?

Yes

Motivation / Use-Case

allow array for headers option :-

          headers: [
            {
              key: "X-Foo",
              value: "value1",
            },
            {
              key: "X-Bar",
              value: "value2",
            },
          ],

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Merging #3847 (f2a2d9c) into master (71da079) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3847      +/-   ##
==========================================
+ Coverage   92.70%   92.72%   +0.02%     
==========================================
  Files          14       14              
  Lines        1329     1334       +5     
  Branches      466      467       +1     
==========================================
+ Hits         1232     1237       +5     
  Misses         89       89              
  Partials        8        8              

Impacted Files	Coverage Δ
lib/Server.js	93.64% <100.00%> (+0.03%)	⬆️

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