408 Request Timeout
This is an educational reference page about HTTP 408 Request Timeout. The page itself is served as 200 OK so it can be indexed as HTTP documentation.
The server timed out waiting for the request. According to HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time."
Specification
Registered in the IANA HTTP Status Code Registry as Request Timeout. Defined in RFC 9110, Section 15.5.9.
Header and content rules
RFC 9110 adds no header or content rule specific to 408. The 4xx class rules also apply. See 408 in the response obligations table.