HTTP 499 Client Closed Request vs 505 HTTP Version Not Supported
HTTP 499 (Client Closed Request) is a 4xx Client Error response, while 505 (HTTP Version Not Supported) is a 5xx Server Error response. 499 indicates that a non-standard status code used by Nginx when the client closes the connection before the server responds. In contrast, 505 means that the server does not support the HTTP version used in the request.
Description
A non-standard status code used by Nginx when the client closes the connection before the server responds.
When You See It
In Nginx logs when clients timeout or navigate away before receiving the response.
How to Fix
Optimize server response times. Check for slow upstream services.
Description
The server does not support the HTTP version used in the request.
When You See It
When a client uses an HTTP version the server doesn't support.
How to Fix
Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).
Key Differences
499 is a 4xx Client Error response, while 505 is a 5xx Server Error response.
HTTP 499: A non-standard status code used by Nginx when the client closes the connection before the server responds.
HTTP 505: The server does not support the HTTP version used in the request.
You encounter 499 when in Nginx logs when clients timeout or navigate away before receiving the response.
You encounter 505 when when a client uses an HTTP version the server doesn't support.
When to Use Which
For 499 (Client Closed Request): Optimize server response times. Check for slow upstream services. For 505 (HTTP Version Not Supported): Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).