Use this text operation when its stated character encoding, token boundaries, normalization, case handling, and output format match the surrounding workflow.

Referrer-Policy header

Required string.

The cited overview of HTTP referer supplies background for the terminology and domain context used by this tool.^[1]

Select the last recognized token from a comma-separated Referrer-Policy header while preserving an empty result if none is recognized. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Last recognized policy

Returned string.

Recognized a policy

Returned boolean.

• Unicode normalization, locale, grapheme clusters, malformed input, ambiguous syntax, and implementation-specific conventions can change text-processing results.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Preserve the original text, test representative non-ASCII and malformed cases, and use a standards-aware parser or serializer when interoperability matters.

• Transfer Encoding Parser

  Parse a simple comma-separated Transfer-Encoding coding list into lowercase HTTP tokens; extension parameters are outside this tool's scope.

• Vary Parser

  Parse a Vary response header as a case-insensitive set of field names or the single wildcard value.

• Cross-Origin Attribute Parser

  Resolve an HTML crossorigin attribute to no-CORS, anonymous, or use-credentials state; an invalid present value defaults to anonymous.