Content-Length

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

Header type Request header, Response header, Payload header
Forbidden header name yes
CORS-safelisted response header yes

Syntax

Content-Length: <length>

Directives

<length>
The length in decimal number of octets.

Specifications

Specification
Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing (HTTP/1.1)
# header.content-length

Browser compatibility

BCD tables only load in the browser

See also