API Schema Evolution Breaking Changes
API schema evolution breaks clients when backward compatibility is not maintained.
Category archive
API fixes
Published troubleshooting guides for api issues.
API Gateway mTLS Client Cert Rejected
API gateway rejects client certificates when CA is not trusted.
API Gateway SSL Termination Failed
API gateway SSL termination fails when certificate chain is incomplete.
API Gateway Path Based Routing Broken
API gateway path-based routing fails when route rules are misordered.
API Gateway Hostname Routing Wrong
API gateway routes to wrong backend when host header matching is incorrect.
API Gateway Timeout Backend Slow
API gateway times out when backend response exceeds timeout setting.
API Gateway Request Size Limit
API gateway rejects large requests when body size exceeds limit.
API Gateway Authentication Bypass
API gateway authentication is bypassed when authorization policy is misconfigured.
API Gateway Transform Failed
API gateway response transformation fails when template is invalid.
API Gateway Circuit Open
API gateway circuit breaker is open blocking requests to backend.
API Webhook Replay Attack
API webhook replay attacks succeed when timestamp validation is missing.
API Webhook Signature Verification
API webhook signature verification fails when secret is rotated.
API Webhook Delivery Failed
API webhook delivery fails when endpoint is unreachable or returns non-2xx.
API Idempotency Key Collision
API idempotency returns wrong response when key is reused incorrectly.
API Pagination Cursor Invalid
API cursor pagination fails when cursor token is malformed.
API Key Rotation Breaking Clients
API key rotation breaks clients when old keys are invalidated too quickly.
API OAuth2 Scope Insufficient
API OAuth2 scope is insufficient for the requested operation.
API OAuth2 Refresh Token Expired
API OAuth2 refresh token is expired requiring re-authentication.
API OAuth2 Token Exchange Failed
API OAuth2 token exchange fails when client credentials are invalid.
API JWT Claims Validation Failed
API JWT claims validation fails when required claims are missing.
API JWT Signature Verification Failed
API JWT authentication fails when signature does not verify.
API CORS Preflight Failed
API CORS preflight fails when Access-Control headers are misconfigured.
API Versioning Not Working
API versioning fails when Accept header or URL version is not parsed correctly.
Swagger UI Not Loading
Swagger UI does not load when spec URL is unreachable.
OpenAPI Spec Mismatch
OpenAPI implementation does not match specification causing client errors.
SOAP Fault Security Error
SOAP faults return security errors when WS-Security header is invalid.
SOAP WSDL Validation Failed
SOAP requests fail when WSDL schema validation rejects the message.
gRPC Streaming Connection Lost
gRPC streaming calls fail when connection is interrupted mid-stream.
gRPC Interceptor Chain Broken
gRPC interceptors fail to execute when chain is not properly constructed.
gRPC Load Balancing Not Working
gRPC client-side load balancing fails when resolver is misconfigured.
gRPC Status Resource Exhausted
gRPC calls return RESOURCE_EXHAUSTED when server resources are depleted.
gRPC Status Permission Denied
gRPC calls return PERMISSION_DENIED when authentication credentials are insufficient.
gRPC Status Internal Error
gRPC calls return INTERNAL when server encounters unexpected condition.
gRPC Status Deadline Exceeded
gRPC calls return DEADLINE_EXCEEDED when request takes too long.
gRPC Status Unavailable
gRPC calls return UNAVAILABLE when server is down or connection is lost.
GraphQL Introspection Disabled
GraphQL introspection queries fail when disabled in production.
GraphQL Subscription Not Firing
GraphQL subscriptions do not fire when pubsub engine is disconnected.
GraphQL N+1 Query Problem
GraphQL N+1 queries cause performance issues when dataloader is not used.
GraphQL Resolver Not Found
GraphQL resolver is not found when field mapping is misconfigured.
GraphQL Query Validation Error
GraphQL query fails when schema validation rejects the operation.
REST API 503 Service Unavailable
REST API returns 503 when service is temporarily unable to handle requests.
REST API 502 Bad Gateway
REST API returns 502 when upstream service returns invalid response.
REST API 500 Internal Server Error
REST API returns 500 when unhandled exception occurs during request processing.
REST API 429 Too Many Requests
REST API returns 429 when client exceeds rate limit quota.
REST API 422 Unprocessable Entity
REST API returns 422 when request is syntactically correct but semantically invalid.
REST API 409 Conflict
REST API returns 409 when request conflicts with current resource state.
REST API 404 Not Found
REST API returns 404 when requested resource or endpoint does not exist.
REST API 403 Forbidden
REST API returns 403 when authenticated user lacks required permissions.
REST API 401 Unauthorized
REST API returns 401 when authentication token is missing or expired.
REST API 400 Bad Request
REST API returns 400 when request body JSON is malformed or required fields are missing.