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referrer-policy-middleware\n\n[![deno land](http://img.shields.io/badge/available%20on-deno.land/x-lightgrey.svg?logo=deno)](https://deno.land/x/referrer_policy_middleware)\n[![deno doc](https://doc.deno.land/badge.svg)](https://doc.deno.land/https/deno.land/x/referrer_policy_middleware/mod.ts)\n[![GitHub release (latest by date)](https://img.shields.io/github/v/release/httpland/referrer-policy-middleware)](https://github.com/httpland/referrer-policy-middleware/releases)\n[![codecov](https://codecov.io/github/httpland/referrer-policy-middleware/branch/main/graph/badge.svg)](https://codecov.io/gh/httpland/referrer-policy-middleware)\n[![GitHub](https://img.shields.io/github/license/httpland/referrer-policy-middleware)](https://github.com/httpland/referrer-policy-middleware/blob/main/LICENSE)\n\n[![test](https://github.com/httpland/referrer-policy-middleware/actions/workflows/test.yaml/badge.svg)](https://github.com/httpland/referrer-policy-middleware/actions/workflows/test.yaml)\n[![NPM](https://nodei.co/npm/@httpland/referrer-policy-middleware.png?mini=true)](https://nodei.co/npm/@httpland/referrer-policy-middleware/)\n\nHTTP referrer policy middleware.\n\nCompliant with [Referrer Policy](https://www.w3.org/TR/referrer-policy/).\n\n## Middleware\n\nFor a definition of Universal HTTP middleware, see the\n[http-middleware](https://github.com/httpland/http-middleware) project.\n\n## Usage\n\nMiddleware adds the `Referrer-Policy` header to the response.\n\n```ts\nimport {\n  type Handler,\n  referrerPolicy,\n} from \"https://deno.land/x/referrer_policy_middleware@$VERSION/mod.ts\";\nimport { assert } from \"https://deno.land/std/testing/asserts.ts\";\n\ndeclare const request: Request;\ndeclare const handler: Handler;\n\nconst middleware = referrerPolicy();\nconst response = await middleware(request, handler);\n\nassert(response.headers.has(\"referrer-policy\"));\n```\n\nyield:\n\n```http\nReferrer-Policy: strict-origin-when-cross-origin\n```\n\nThe default field value is `strict-origin-when-cross-origin`.\n\n## Policy\n\nTo change the referrer policy, do the following:\n\n```ts\nimport {\n  referrerPolicy,\n} from \"https://deno.land/x/referrer_policy_middleware@$VERSION/middleware.ts\";\n\nconst middleware = referrerPolicy(\"no-referrer\");\n```\n\nyield:\n\n```http\nReferrer-Policy: no-referrer\n```\n\nMultiple directives may be specified.\n\nThe UA ignores directives that are unknown to it and uses the last one.\n\n```ts\nimport {\n  referrerPolicy,\n} from \"https://deno.land/x/referrer_policy_middleware@$VERSION/middleware.ts\";\n\nconst middleware = referrerPolicy([\"no-referrer\", \"unsafe-url\"]);\n```\n\nyield:\n\n```http\nReferrer-Policy: no-referrer, unsafe-url\n```\n\n## Conditions\n\nMiddleware will execute if all of the following conditions are met:\n\n- Response does not include `Referrer-Policy` header\n\n## Effects\n\nMiddleware may make changes to the following elements of the HTTP message.\n\n- HTTP Headers\n  - Referrer-Policy\n\n## API\n\nAll APIs can be found in the\n[deno doc](https://doc.deno.land/https/deno.land/x/referrer_policy_middleware/mod.ts).\n\n## License\n\nCopyright © 2023-present [httpland](https://github.com/httpland).\n\nReleased under the 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