X-Powered-By header

The HTTP X-Powered-By response header is a non-standard header for identifying the application or framework that generated the response.

Header type	[Response header](https://developer.mozilla.org/en-US/docs/Glossary/Response%20header)
[Forbidden response header name](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden%20response%20header%20name)	No

Syntax

X-Powered-By: <application>

Directives

• <application>
  • : A string describing the server application or framework.

Examples

Express X-Powered-By header

Express applications will usually include the X-Powered-By header in responses with the string express as the field value:

X-Powered-By: express

Specifications

Not part of any current specification.

See also

• X-Forwarded-Host, X-Forwarded-For, X-Forwarded-Proto headers
• Via
• Forwarded