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
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Content-Length | ||||||||||||
CORS-safelisted response header |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.