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Built to power [visual-csp.pages.dev](https://visual-csp.pages.dev).\n\n## How it works\n\n```mermaid\nsequenceDiagram\n    participant User as visual-csp.pages.dev\n    participant Worker as csp-clipper (Cloudflare Worker)\n    participant Target as Target Website\n\n    User-\u003e\u003eWorker: GET /csp?url=https://example.com\n    Worker-\u003e\u003eWorker: Validate URL \u0026 check rate limit\n    alt Rate limit exceeded\n        Worker--\u003e\u003eUser: 429 Too Many Requests\n    else\n        Worker-\u003e\u003eTarget: GET https://example.com\n        Target--\u003e\u003eWorker: HTTP Response with headers\n        Worker-\u003e\u003eWorker: Extract CSP header\n        alt CSP header found\n            Worker--\u003e\u003eUser: 200 { url, csp }\n        else No CSP header\n            Worker--\u003e\u003eUser: 200 { url, csp: null }\n        end\n    end\n```\n\n## API\n\n### `GET /csp?url=\u003ctarget\u003e`\n\n| Parameter | Description |\n|-----------|-------------|\n| `url` | Required. Absolute HTTP or HTTPS URL to fetch the CSP header from. |\n\n### Response\n\n```json\n{\n  \"url\": \"https://example.com\",\n  \"csp\": \"default-src 'self'; script-src 'none'\"\n}\n```\n\nWhen no CSP header is found:\n\n```json\n{\n  \"url\": \"https://example.com\",\n  \"csp\": null,\n  \"message\": \"No CSP header found\"\n}\n```\n\n### Rate Limiting\n\nRequests are limited to **30 per minute** per IP. Rate limit info is included in response headers:\n\n| Header | Description |\n|--------|-------------|\n| `X-RateLimit-Limit` | Maximum requests per window |\n| `X-RateLimit-Remaining` | Remaining requests in current window |\n| `X-RateLimit-Reset` | Unix timestamp when the window resets |\n\n### CORS\n\nOnly requests from `https://visual-csp.pages.dev` are allowed.\n\n## Development\n\n```bash\nnpm install\nnpm run dev       # Start local dev server on localhost:8787\nnpm test          # Run unit tests\n```\n\n## Deploy\n\n```bash\nnpm run deploy\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fteles%2Fcsp-clipper","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fteles%2Fcsp-clipper","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fteles%2Fcsp-clipper/lists"}