Webhook & URL Tester

Build and preview your HTTP request, generate a ready-to-run cURL command, and verify your endpoint works before scheduling it with CronJobPro.

Quick Presets

Endpoint Readiness Checklist

0/6 verified
URL uses HTTPS (not HTTP)
Endpoint returns a 2xx status code
Response time is under 30 seconds
Endpoint is idempotent (safe to retry)
Authentication is configured (if needed)
CORS is not relevant for server-to-server calls

Ready to schedule this endpoint?

CronJobPro will send the exact request you configured above, on any schedule you define. Get automatic retries, failure alerts, and execution logs out of the box.

Start Free — Schedule This Job

Why Test Your Endpoints Before Scheduling

A cron job is only as reliable as the endpoint it calls. If your URL is unreachable, returns an error, or takes too long to respond, your scheduled task will fail silently — and you may not notice until the damage is done. Testing before scheduling eliminates the most common class of cron job failures: a misconfigured or broken endpoint.

This tool generates a cURL command that mirrors exactly what CronJobPro sends when executing your job. Running it locally lets you see the raw HTTP response, check the status code, measure the response time, and inspect the body. Since cURL runs in your terminal, it works with internal endpoints, private networks, and URLs behind firewalls — situations where browser-based testing fails due to CORS restrictions.

The endpoint readiness checklist covers the six most important things to verify: encryption (HTTPS), correct status codes, response time, idempotency, authentication, and understanding that CORS does not apply to server-to-server calls. Completing the checklist gives you confidence that your endpoint is production-ready before you create the cron job.

Common Endpoint Issues

These problems account for the vast majority of cron job failures. Catch them before they cause missed schedules.

  • Endpoint returns 403 or 401

    Your server is rejecting the request because of missing or incorrect authentication. Add an Authorization header with a valid Bearer token or API key. Check that your server recognizes the CronJobPro User-Agent.

  • SSL certificate errors

    Expired, self-signed, or misconfigured SSL certificates will cause HTTPS requests to fail. Use a free Let's Encrypt certificate and set up automatic renewal. CronJobPro validates SSL by default.

  • Timeout after 30 seconds

    Long-running tasks should not block the HTTP response. Accept the request immediately (return 202 Accepted), then process the work asynchronously with a queue or background worker.

  • Endpoint returns HTML instead of JSON

    This usually means your URL is hitting a login page, error page, or redirect. Check the actual URL in your browser, verify there are no middleware redirects, and make sure the Content-Type header matches what your endpoint expects.

  • DNS resolution failure

    If the domain does not resolve, the request never reaches your server. Verify the domain is active, DNS records are correct, and there is no typo in the URL. Internal hostnames that only resolve on your network will not work with an external cron service.

  • Firewall blocking external requests

    Your server firewall or security group may block incoming requests from CronJobPro IP addresses. Whitelist the CronJobPro IP ranges, or use a webhook relay service if your endpoint is behind a strict firewall.

  • Non-idempotent endpoints causing duplicate actions

    Network timeouts can cause CronJobPro to retry a request. If your endpoint sends an email or charges a card on every call, duplicates will happen. Use a unique execution ID or check for already-processed records to make your endpoint idempotent.

Frequently Asked Questions

How do I test if my cron job endpoint works?
Enter your endpoint URL above, select the HTTP method, add any required headers (such as Authorization), and click the cURL Command tab. Copy the generated command and run it in your terminal. The output shows the HTTP status code, response time, and body, confirming whether your endpoint is working correctly.
Why generate a cURL command instead of testing directly in the browser?
Browser-based HTTP requests are restricted by CORS policies. Most cron job endpoints are APIs that do not set CORS headers because they are designed for server-to-server calls, not browser calls. A cURL command runs in your terminal with no CORS restrictions and works with internal, private, or firewalled endpoints.
What HTTP methods should I use for cron job endpoints?
GET is the most common choice for health checks, data fetching, and simple trigger endpoints. POST is preferred when you need to send data or trigger an action with a request body. PUT and PATCH are for update operations. Use the method your endpoint expects.
What makes a good cron job endpoint?
A reliable cron job endpoint uses HTTPS, returns a 2xx status code on success, responds within 30 seconds, is idempotent (safe to call multiple times), and includes authentication if it performs sensitive operations. The endpoint readiness checklist above covers all these requirements.

Related Tools & Resources

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Learn how webhooks deliver real-time event notifications

What is an Endpoint?

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HTTP Status Codes Reference

Look up any status code your endpoint returns

HTTP Methods Guide

GET vs POST vs PUT — which method for which job

Cron Job Not Running?

Troubleshoot common reasons your scheduled tasks fail

HTTP Status Code Glossary

Understand what each status code means for your cron jobs