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