1xx InformationalHTTP Status Code Reference

HTTP 103 Early Hints— What It Means, Causes & How to Fix It

The server sends preliminary headers to the client before the final response. This allows the browser to start preloading resources like stylesheets and scripts while the server prepares the full response.

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Enter any URL to see its real HTTP response code

Common Causes

  • Server sending Link headers for resource preloading
  • CDN or reverse proxy providing early hints
  • Performance optimization for critical resources

How to Fix

  1. 1No fix needed — this improves page load performance
  2. 2Ensure the Link headers point to valid resources
  3. 3Verify browser supports 103 Early Hints

Example

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

→ Browser begins fetching style.css
→ Server sends final 200 OK response

Related Informational Codes

100

Continue

101

Switching Protocols

102

Processing

Commonly Referenced Status Codes

The most frequently searched HTTP status codes

200OK201Created204No Content301Moved Permanently302Found400Bad Request401Unauthorized403Forbidden404Not Found422Unprocessable Content429Too Many Requests500Internal Server Error502Bad Gateway503Service Unavailable504Gateway Timeout

Related Tools

HTTP Status LookupAPI Request BuildercURL GeneratorHTTP Header ViewerHTTP Header DiffRedirect Checker