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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIf webhook signature checks started failing after a deploy, first confirm which provider is sending the request, then verify that production passes the provider’s required headers and exact request data to its verifier. A changed secret, parser, proxy, algorithm, or timestamp check can break verification; there is no universal webhook signature format.
Minute 0–5: Confirm the sender, endpoint and secret
Start with the exact provider and webhook endpoint that are failing. Check the provider’s current validation documentation and the secret configured for that specific endpoint and environment. A local test secret, staging secret, or secret belonging to another endpoint will not validate production deliveries.
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Signature rules are provider-specific. GitHub, for example, recommends the X-Hub-Signature-256 header with HMAC-SHA256; its older X-Hub-Signature header uses HMAC-SHA1. Match the header and algorithm your deployed verifier uses to the endpoint’s configuration and GitHub’s validation guidance. Do not assume another sender uses the same header or signing recipe.
Minute 5–10: Check whether verification receives the raw body
Ask: Are you passing the raw request body? Verify the request before JSON parsing or reserializing it. Parsing and stringifying can change whitespace, escaping, or key representation, even when the resulting JSON describes the same data. A signature computed over the original bytes will not match a changed representation.
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Svix identifies use of a non-raw body as the number one reason for verification failures in its webhook receiving guide. Its own signing scheme includes a message ID, timestamp, and raw body; that is an example, not a recipe to apply to other providers.
Minute 10–15: Trace the deployed request path
Review what changed between the last working deployment and the failing one. Follow the request from ingress through any proxy, gateway, load balancer, serverless adapter, body parser, and application handler. A component in that path may alter a payload or remove or transform a header before the verifier sees it. GitHub likewise advises checking that proxies and load balancers have not modified webhook payloads or headers.
- Compare the headers arriving at the application with the provider’s documented signature header.
- Confirm middleware ordering: the verifier must have access to the original body before a parser consumes or transforms it.
- Check adapter or platform changes that may affect how request bytes are exposed.
- Compare the bytes supplied to verification with the bytes received at ingress, using a safe method that does not expose secrets or unnecessarily log sensitive payloads.
Use GitHub’s guidance on validation and delivery troubleshooting as a concrete example of the proxy and load-balancer concern; the same investigation should be grounded in your own provider and platform documentation.
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Minute 15–20: Recheck header, algorithm and secret together
Treat these as one configuration check, not independent guesses. Confirm that the deployed code reads the provider’s expected header, applies the documented algorithm, and uses the secret currently configured for the failing endpoint. For GitHub, that means checking that a verifier intended to use the recommended X-Hub-Signature-256 header actually uses HMAC-SHA256 rather than the legacy HMAC-SHA1 header or a mismatched algorithm.
When comparing two providers, inspect the same dimensions instead of copying settings between them:
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| What to compare | GitHub example | Svix example |
|---|---|---|
| Signature header | X-Hub-Signature-256 is the recommended header in GitHub’s validation documentation. |
Follow the headers described in Svix’s receiving guide; do not substitute GitHub’s header. |
| Algorithm | HMAC-SHA256 for the recommended header; the legacy X-Hub-Signature uses HMAC-SHA1. |
HMAC-SHA256 in the guide’s manual verification example. |
| Signed inputs | Use GitHub’s documented validation inputs and implementation. | Message ID, timestamp, and raw body are included in the signed content string. |
| Secret and timestamp handling | Use the secret configured for the endpoint and GitHub’s documented validation procedure. | Use the secret material and timestamp checks described in Svix’s guide. |
These examples are not interchangeable implementations. Use the sender’s own current instructions, including its secret format and any replay protections.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Minute 20–25: If timestamps are signed, check time and tolerance
First establish whether the provider’s scheme includes a timestamp. If it does, confirm that the deployed server clock is accurate and that the verifier uses the provider’s timestamp format and allowed tolerance. Svix recommends accurate system time synchronized with NTP. There is no universal timestamp tolerance: use the value and validation behavior specified by the provider.
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Minute 25–30: Isolate the failing layer with a known delivery
Choose a provider delivery that failed and trace its signature header and preserved body into the verifier. Check whether the verifier receives the same documented inputs the provider expects. If validation succeeds locally but fails only in production, focus on differences in deployed secrets, middleware, adapters, proxies, headers, and clock configuration. This comparison narrows the investigation; it does not establish a cause until the failing input or configuration is identified.
Keep diagnostic records limited to what you need to compare request handling. Do not log signing secrets, and avoid retaining sensitive payload contents when safer metadata or controlled comparisons will answer the question.
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