HTTP 103 Early Hints vs 428 Precondition Required
HTTP 103 (Early Hints) is a 1xx Informational response, while 428 (Precondition Required) is a 4xx Client Error response. 103 indicates that used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response. In contrast, 428 means that the server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
Descrição
Used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response.
Quando você o vê
When a server wants the browser to start loading CSS/JS before the full response is ready.
Como corrigir
No fix needed. This optimization helps speed up page loading.
Descrição
The server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
Quando você o vê
When an API requires optimistic concurrency control via ETags.
Como corrigir
Fetch the resource first to get its ETag, then include If-Match in your update request.
Diferenças principais
103 is a 1xx Informational response, while 428 is a 4xx Client Error response.
HTTP 103: Used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response.
HTTP 428: The server requires the request to be conditional (e.g., include If-Match header) to prevent lost updates.
You encounter 103 when when a server wants the browser to start loading CSS/JS before the full response is ready.
You encounter 428 when when an API requires optimistic concurrency control via ETags.
Quando usar qual
For 103 (Early Hints): No fix needed. This optimization helps speed up page loading. For 428 (Precondition Required): Fetch the resource first to get its ETag, then include If-Match in your update request.