Callback Test Online — Test HTTP Callbacks & Webhooks | Send Web Request
Test callbacks online without writing a line of server code. Get a unique callback URL in seconds, point your service at it, and watch every incoming HTTP callback arrive — full method, headers, and body. Free, no signup. Works for OAuth redirects, payment callbacks, and webhooks.
What is a callback test?
A callback (or webhook) is an HTTP request a remote service sends back to a URL you control when something happens — a payment completes, an OAuth login finishes, a job ends. To test one, you need a reachable URL that captures the incoming request so you can see exactly what the service sent. A callback test tool gives you that URL instantly, so you can verify the payload before writing any server code.
Why you can't test callbacks on localhost
During development your server runs on localhost, which the internet can't reach. A remote service trying to deliver a callback to localhost will fail. Instead of setting up a tunnel (ngrok) or deploying code just to see one payload, point the service at a public callback URL from Send Web Request and inspect the request directly.
How to test a callback
Open the webhook page and create a callback URL. Copy it into your service's callback or redirect-URL setting (Stripe webhook endpoint, OAuth redirect URI, CI/CD notification URL, etc.). Trigger the event. The callback appears with the full HTTP method, every header, and the complete body — so you can confirm the structure and debug your handler against real data.
Common callback scenarios
OAuth redirects (the provider appends a code or token to your redirect URI), payment callbacks (Stripe, PayPal, and others POST an event when a charge settles), CI/CD notifications (a pipeline pings a URL on success or failure), and SMS/email delivery receipts. In each case the callback test URL captures exactly what the provider sends.
Example callback payload
A payment provider might POST a callback like this:
POST https://your-callback-url
Content-Type: application/json
{
"event": "payment.succeeded",
"id": "pay_12345",
"amount": 4200,
"currency": "usd",
"status": "succeeded"
}Inspecting headers and signatures
Many providers sign callbacks with a header (Stripe-Signature, X-Hub-Signature-256). The callback test view shows every header so you can confirm the signature is present and verify it against your secret before trusting the payload. Never process a callback without checking its signature.
Test a callback now
Open Send Web Request, create a callback URL, and start capturing incoming callbacks. Free, instant, no signup.
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