http-428
Easy Fix
HTTP API · API Responses
HTTP 428 Precondition Required indicates missing required precondition headers for this API request path.
Quick Answer
Error code HTTP-428 on your HTTP API API Responses means: HTTP 428 Precondition Required indicates missing required precondition headers for this API request path.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Inspect API logs/traces for HTTP 428 with full request/response metadata.
2
Validate request construction against endpoint spec focusing on: missing required precondition headers.
3
Fix client auth, payload, headers, or resource assumptions before retrying.
4
Add explicit handling path for HTTP 428 in SDK/service code.
5
Run regression tests to confirm HTTP 428 no longer appears unexpectedly.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Related Error Codes