Let the HTTP client retry a second time if a persistent request response is missing.
Let the HTTP client retry a second time if a persistent request response is missing.

In cases where the server closes the connection before sending a response to the latest request on a keep-alive connection, the client now reconnects and resends the response. See #1337.

schuetzm/vibe.d,AndreyMZ/vibe.d,redstar/vibe.d,etcimon/vibe.d,rejectedsoftware/vibe.d,DBankov/vibe.d,etcimon/vibe.d,Mihail-K/vibe.d,machindertechnologies/vibe.d,chalucha/vibe.d,Geod24/vibe.d,gedaiu/vibe.d