tool::http-status-detail

103 Early Hints

Used to preload resources while the server is still processing.

Status Code

103

Name

Early Hints

Detailed Explanation

HTTP 103 Early Hints allows a server to send Link headers before the final response is ready, enabling browsers to start preloading resources while the server is still processing. It improves page load performance by providing preload hints for CSS, fonts, and critical scripts early in the response pipeline.

Common Causes

▸A server needs to preload CSS/JS resources during server-side rendering
▸A CDN sends resource hints while waiting for the origin server's response
▸Performance optimization requiring critical resource preloading

How to Fix

1.103 is a normal performance optimization response — no fix needed
2.Use rel=preload or rel=preconnect in the Link header
3.Verify browser support (Chrome 103+, Edge, and other modern browsers)

Related HTTP Headers

Link

Response Example

HTTP/1.1 103 Early Hints
Link: </style.css>; rel=preload; as=style
Link: </script.js>; rel=preload; as=script

Related Status Codes

100ContinueClient should continue with the request.→101Switching ProtocolsServer is switching protocols as requested.→102ProcessingServer has received the request but has not yet completed it.→

← Back to all status codes

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