Content-Length

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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Заголовок Content-Length указывает размер отправленного получателю тела объекта в байтах.

Тип заголовка	Заголовок сущности
Можно не передавать	да

Синтаксис

Content-Length: <длина>

Specification
HTTP Semantics # field.content-length