Content-Length

The HTTP Content-Length header indicates the size, in bytes, of the message body sent to the recipient.

Header type Request header, Response header, Content header
Forbidden header name Yes
CORS-safelisted response header Yes

Syntax

http
Content-Length: <length>

Directives

<length>

The length in octets.

Specifications

Specification
HTTP Semantics
# field.content-length

Browser compatibility

BCD tables only load in the browser

See also