HTTP Security Headers Checker
Check a website's HTTP security headers, redirect chain, and common browser protection settings.
HTTP Status Sandbox
Create mock endpoints that return configurable HTTP status codes for testing client behavior.
Build a mock response URL
Generated endpoint
200 OKHow to use this HTTP status sandbox
Use this sandbox when you need a dependable endpoint that returns the status code your code path is supposed to handle.
- Choose the HTTP status code you want to test.
- For statuses that include a body, use the JSON response to inspect the status code, status text, request method, path, and query values.
- Copy the generated URL into your test, script, monitor, webhook handler, or manual QA checklist.
HTTP Status Sandbox features
- Return HTTP status codes from 200 through 999, including unregistered extension codes.
- Use simple endpoints such as /developer/http-status-sandbox/404.
- Support GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS requests.
- Return JSON responses for statuses that allow response bodies.
- Reflect the request method and path in JSON responses.
- Include CORS headers so browser fetch tests can read the response.
- Redirect 300, 301, 302, 303, 307, and 308 responses to the 200 sandbox endpoint.
- Copy the generated endpoint URL.
Why mock status endpoints are useful
Application code often works well on the happy path and becomes fragile around errors, redirects, empty responses, timeouts, and rate limits. A status sandbox gives you a stable URL that intentionally returns a specific HTTP result, so you can exercise those paths without changing a real API, waiting for an outage, or building a temporary endpoint in your own app.
Use a 404 endpoint to check missing-resource messages, a 401 or 403 endpoint to review authentication and permission flows, a 429 endpoint to test rate-limit copy and retry behavior, and a 500 or 503 endpoint to confirm that users see a useful fallback when an upstream service fails. For success paths, 201 and 204 responses are helpful because they catch assumptions about response bodies after create, update, or delete actions.
The sandbox is deliberately predictable. It does not store requests, inspect secrets, or behave like a full mock-server product. That makes it useful for unit tests, manual QA, examples in documentation, uptime monitor configuration, and quick client-side experiments where the only thing you need is a known HTTP response.
How the sandbox responds
The endpoint reads the three-digit status code from the URL path, validates that it is from 200 through 999, and sends that response from utilkit. It supports GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS requests so you can test the methods your client actually sends. JSON is the response format for status codes that can include a body. The JSON body includes the status code, reason phrase when one is registered, request method, path, and query parameters.
Informational 1xx statuses are excluded because they are interim protocol responses, not final responses a mock endpoint can safely return as a completed request. Statuses such as 204 No Content, 205 Reset Content, and 304 Not Modified are sent without a body. Redirect responses such as 301, 302, 303, 307, and 308 include a Location header that points to the 200 sandbox endpoint.
Sandbox responses include Access-Control-Allow-Origin: * so browser-based fetch tests can read the response without extra setup.
HTTP status sandbox FAQ
Can I use this from automated tests?
Yes. The endpoints are stable and accept common HTTP methods, so they work well for smoke tests, client integration tests, retry logic, and documentation examples.
Why are 1xx status codes not available?
Informational 1xx statuses are interim protocol responses, not final completed responses. The sandbox starts at 200 so generated endpoints do not leave clients waiting for a later final response.
Does the sandbox log or store request bodies?
No. It returns a mock response and does not provide request capture, replay, or hosted mock-server storage.
Can I test redirects?
Yes. Choose 300, 301, 302, 303, 307, or 308. The response includes a Location header that points to the 200 sandbox endpoint so clients can test redirect handling.
Why does 204 return an empty body?
204 No Content is defined as a response without content. It is one of the sandbox responses that intentionally does not include a JSON body.
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