docs: Add `HTTP headers` guide #705

Job	Run time
PR title check	6s
Checks / Actions lint check	30s
Checks / Package check	37s
Checks / Doc check / Docs check	1m 44s
Checks / Spell check	6s
Checks / Type check / Type check (3.14)	34s
Checks / Type check / Type check (3.13)	29s
Checks / Lint check / Lint check (3.11)	29s
Checks / Type check / Type check (3.10)	55s
Checks / Lint check / Lint check (3.13)	31s
Checks / Type check / Type check (3.12)	36s
Checks / Lint check / Lint check (3.10)	29s
Checks / Lint check / Lint check (3.12)	37s
Checks / Type check / Type check (3.11)	37s
Checks / Lint check / Lint check (3.14)	35s
Checks / Unit tests / Unit tests (windows-latest, 3.10)	7m 49s
Checks / Unit tests / Unit tests (macos-latest, 3.13)	4m 21s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 0s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	9m 6s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 39s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 56s
Checks / Unit tests / Unit tests (macos-latest, 3.11)	4m 31s
Checks / Unit tests / Unit tests (macos-latest, 3.10)	5m 52s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	6m 42s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	5m 24s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	7m 25s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	6m 44s
Checks / Unit tests / Unit tests (macos-latest, 3.14)	3m 23s
Checks / Unit tests / Unit tests (macos-latest, 3.12)	5m 59s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 29s
	1h 36m 15s

Provide feedback