100100 Continue
The server has received the request headers and the client should proceed to send the request body.
422The server understands the content type and syntax but cannot process the contained instructions due to semantic errors.
The request is syntactically correct but contains invalid data. Common examples: invalid email format, a number out of allowed range, missing required fields, or referencing a non-existent related resource.
Check the response body for specific validation error messages. Fix the invalid fields and retry. Validate your data client-side before sending to catch these errors early.
fetch('/api/users', { method: 'POST', body: JSON.stringify({ email: 'not-an-email' }) })100The server has received the request headers and the client should proceed to send the request body.
423The resource being accessed is locked and cannot be modified (WebDAV).
204The server successfully processed the request but is not returning any content in the response body.
504A gateway or proxy server did not receive a timely response from the upstream server.
425The server is unwilling to process a request that might be replayed, to avoid potential replay attacks.
203The response has been modified by a transforming proxy and differs from what the origin server sent.