Testing, Mocking & Request Simulation
Build cURL commands and Authorization headers, generate OpenAPI security schemes, and simulate rate-limit headers and 401/403 responses to test client error handling.
Tools in Testing
- SIM
cURL command generator
Build an authenticated request as cURL, fetch, httpx or HTTPie, and see the raw HTTP it produces.
- SIM
Authorization header builder
Build Bearer, Basic, ApiKey and Token headers for tests and fixtures.
- SIM
Rate limit header simulator
See exactly what your client receives at the limit, in three header conventions.
- SIM
OpenAPI & Postman scheme generator
Generate a correct OpenAPI 3.1 securityScheme or a Postman collection with auth configured.
- SIM
401 & 403 error simulator
See the exact response for each auth failure mode, and what actually causes it.
- SIM
API authentication sandbox
Step a request through the checks a gateway performs and see exactly where it fails.
- SIM
Webhook payload simulator
Generate a signed event and replay it locally, including the tampered version your endpoint must reject.
- SIM
REST & GraphQL auth header debugger
Paste your request headers and find the malformed credential in seconds.