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HTTP Header
Referrer-Policy
SecurityControls how much referrer information should be sent with requests.
HTTP header reference, syntax, examples, and developer usage.
What is the Referrer-Policy header?
The Referrer-Policy HTTP header is used to transmit metadata between a client and server as part of HTTP requests or responses.
HTTP headers define how content should be interpreted, cached, authenticated, secured, or processed by browsers and APIs.
Direction
This header may appear in both HTTP requests and responses.
Syntax
Referrer-Policy: policy
Example
Referrer-Policy: strict-origin-when-cross-origin
Common use cases
- Privacy improvements
- Reducing leaked URL information
- Security hardening
Common mistakes
- Using the header in the wrong request or response context
- Sending invalid header values
- Incorrect header syntax
- Assuming the header automatically changes server behaviour