Source type

LaunchDarkly Source Configuration

LaunchDarkly sources receive feature flag, environment, project, and account activity webhooks with signed payload verification.

LAUNCHDARKLYPOST, PUT, PATCH, DELETEWebhook Signing SecretDeveloper tools
LaunchDarkly webhooks documentationAll source types
LaunchDarkly sends webhook traffic to a FastHook source, FastHook validates the provider contract, records the request, and routes accepted events through connections to destinations.LaunchDarklyProviderPOST, PUT, PATCH, DELETESignedFastHookSource URLLAUNCHDARKLYProvider credentialsignatureVerify before queue401 on auth failure405 on wrong methodAcceptedRequestverified: trueConnections route the accepted request to destinationsFilters, transformations, retries, replay, and destination signatures stay downstream from source verification.

LaunchDarkly configuration

Create a LaunchDarkly source, keep POST and PUT and PATCH and DELETE enabled, and provide the configured Webhook Signing Secret values for provider signature. FastHook uses these settings to validate each LaunchDarkly delivery before it enters the routing workflow.

Source Type

LAUNCHDARKLY

Allowed methods

POST, PUT, PATCH, DELETE

Authentication

Provider signature

Credential fields

Webhook Signing Secret

LaunchDarkly source config
{
  "type": "LAUNCHDARKLY",
  "config": {
    "auth_type": "PROVIDER_SIGNATURE",
    "auth": {
      "provider": "LAUNCHDARKLY",
      "webhook_signing_secret": "provider-secret"
    },
    "allowed_http_methods": ["POST","PUT","PATCH","DELETE"]
  }
}

LaunchDarkly request contract

FastHook computes HMAC-SHA256 hex over the raw body and compares it with x-ld-signature.

POSTPUTPATCHDELETE

LaunchDarkly headers

Preserve x-ld-signature when sending LaunchDarkly test deliveries. FastHook evaluates this request context before accepting the payload, so missing or modified values remain visible as rejected requests instead of routed events.

x-ld-signature

HMAC-SHA256 hex signature over the raw body.

LaunchDarkly setup

  1. Create a LaunchDarkly webhook and enable signing.
  2. Use the LaunchDarkly webhook secret in FastHook.
  3. Route flag and environment events to audit or deployment systems.

Continue with LaunchDarkly