Server
The Server header describes the
software used by the origin server that handled the request — that is, the server that
generated the response.
Warning: Avoid overly-detailed Server values, as they can reveal information that
may make it (slightly) easier for attackers to exploit known security holes.
| Header type | Response header |
|---|---|
| Forbidden header name | no |
Syntax
Server: <product>
Directives
- <product>
-
A name of the software or the product that handled the request. Usually in a format similar to
User-Agent.
How much detail to include is an interesting balance to strike; exposing the OS version
is probably a bad idea, as mentioned in the earlier warning about overly-detailed
values. However, exposed Apache versions helped browsers to work around a bug of the
versions with Content-Encoding and
Range in combination.
Examples
Server: Apache/2.4.1 (Unix)
Specifications
| Specification |
|---|
| Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content # header.server |
Browser compatibility
BCD tables only load in the browser