HTTP 598 – Network Read Timeout Error
(Informal convention) Used by some proxies to indicate the connection to the upstream server timed out while reading a response.
Common use case
Surfaces in some corporate and caching proxies when the proxy successfully connects to the upstream but the upstream stalls while streaming the response body.
History
An informal, unofficial convention adopted by some proxy software rather than anything defined by an RFC or major vendor.
Did you know?
Because it has no formal specification, its exact meaning can vary slightly between the handful of proxy products that use it.