HTTP 103 Early Hints vs 520 Web Server Returned an Unknown Error
HTTP 103 (Early Hints) is a 1xx Informational response, while 520 (Web Server Returned an Unknown Error) is a 5xx Server 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, 520 means that cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
描述
Used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response.
何时出现
When a server wants the browser to start loading CSS/JS before the full response is ready.
如何修复
No fix needed. This optimization helps speed up page loading.
描述
Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
何时出现
When Cloudflare receives an empty, unknown, or malformed response from the origin.
如何修复
Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.
主要区别
103 is a 1xx Informational response, while 520 is a 5xx Server 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 520: Cloudflare-specific. The origin server returned an unexpected response that Cloudflare could not process.
You encounter 103 when when a server wants the browser to start loading CSS/JS before the full response is ready.
You encounter 520 when when Cloudflare receives an empty, unknown, or malformed response from the origin.
何时使用哪个
For 103 (Early Hints): No fix needed. This optimization helps speed up page loading. For 520 (Web Server Returned an Unknown Error): Check origin server logs. Ensure responses include proper headers. Verify SSL configuration.