Leywn

Last Echo You Will Need — an all-in-one demo backend for APIs and services.

• GET /echo — echoes back all request details (headers, body, query params, …)
• ANY /echo/{path} — same, for any sub-path
• ANY /status/{code} — respond with any HTTP status code
• GET /image/{type} — serve a demo image (png, jpeg, gif)
• ANY /auth/basic-auth — Basic Auth (username: basic, password: password)
• ANY /auth/basic-auth/{user}/{pass} — Basic Auth with custom credentials
• ANY /auth/api-key — API key (header: apikey: my-key)
• ANY /auth/api-key/{header}/{value} — API key with custom header and value
• ANY /auth/jwt — Bearer JWT (validates structure, not signature)
• ANY /auth/mtls — mTLS client certificate (HTTPS port 4443)
• GET /auth/mtls/get-client-cert — download the generated client cert + key
• ANY /anything — alias for /echo
• GET /uuid — random UUID v4
• GET /guuid — random GUID (UUID v4 in curly braces)
• GET /random — sample of all random values
• GET /random/int — random integer in [-32000, 32000]
• GET /random/int/{lower}/{upper} — random integer in custom range
• GET /random/uint — random unsigned integer in [0, 65535]
• GET /random/lorem-ipsum — one paragraph of Lorem Ipsum
• GET /random/lorem-ipsum/{n} — up to 32 paragraphs of Lorem Ipsum
• GET /ip — caller's IPv4 and IPv6 (set LEYWN_TRUST_FORWARD=true to use X-Forwarded-For)
• GET /ip/v4 — caller's IPv4
• GET /ip/v6 — caller's IPv6
• GET /date — current date in UTC (ISO 8601)
• GET /date/{timezone} — current date in given timezone (e.g. America/New_York)
• GET /time — current time in UTC (ISO 8601)
• GET /time/{timezone} — current time in given timezone
• ANY /auth/jwt/exchange — exchange a Bearer JWT for a Leywn-signed HS256 JWT