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.
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