refactor(request): toLowerCase() is unnecessary for req.header()

[yusukebe]

The arg of get in the Headers object is not case-insensitive. So, the name.toLowerCase() is unnecessary.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[github-actions]

Bundle size check

	main (093d3fd)	#3880 (fd3fc7e)	+/-
Bundle Size (B)	18,771B	18,757B	-14B
Bundle Size (KB)	18.33K	18.32K	-0.01K

Compiler Diagnostics

	main (093d3fd)	#3880 (fd3fc7e)	+/-
Files	257	257	0
Lines	115,048	115,048	0
Identifiers	112,929	112,928	-1
Symbols	301,429	301,429	0
Types	213,638	213,638	0
Instantiations	3,090,073	3,090,073	0
Memory used	445,303K	445,165K	-138K
I/O read	0.02s	0.02s	0s
I/O write	0s	0s	0s
Parse time	0.67s	0.67s	0s
Bind time	0.28s	0.3s	0.02s
Check time	5.83s	5.73s	-0.1s
Emit time	0s	0s	0s
Total time	6.78s	6.7s	-0.08s

---

Reported by octocov

[yusukebe]

Hi @EdamAme-x

Can you review this?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.78%. Comparing base (b2affb8) to head (cb67408).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3880   +/-   ##
=======================================
  Coverage   90.78%   90.78%           
=======================================
  Files         162      162           
  Lines       10263    10263           
  Branches     2943     2866   -77     
=======================================
  Hits         9317     9317           
  Misses        945      945           
  Partials        1        1           

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[EdamAme-x]

LGTM! (Sorry for late)
If you ping me on X, I will notice it right away!

[yusukebe]

@EdamAme-x

Thank you! Merging.