Here ya go:

[B72ACF80:B72AF100 WRN] Handling of connection failed: Remote hung up while operating on TCPConnection.
[B72ACF80:B72AF100 dbg] object.Exception@/home/dev/apps/vibe.d/source/vibe/core/drivers/libevent2_tcp.d(273): Remote hung up while operating on TCPConnection.
----------------
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(pure @safe bool std.exception.enforce!(bool).enforce(bool, lazy const(char)[], immutable(char)[], uint)+0x2c) [0x81b6ce4]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.core.drivers.libevent2_tcp.Libevent2TcpConnection.checkConnected()+0x7d) [0x81fd539]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.core.drivers.libevent2_tcp.Libevent2TcpConnection.write(const(ubyte[]), bool)+0x44) [0x81fd328]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.stream.stream.OutputStream.write(const(char[]), bool)+0x42) [0x81a9816]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.http.server.HttpServerResponse.writeHeader()+0x128) [0x8171c2c]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(@property vibe.stream.stream.OutputStream vibe.http.server.HttpServerResponse.bodyWriter()+0x1de) [0x8171526]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(bool vibe.http.server.handleRequest(vibe.stream.stream.Stream, immutable(char)[], vibe.http.server.HTTPServerListener, ref vibe.http.server.HttpServerSettings).void errorOut(int, immutable(char)[], immutable(char)[], object.Throwable)+0x177) [0x81740e3]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(bool vibe.http.server.handleRequest(vibe.stream.stream.Stream, immutable(char)[], vibe.http.server.HTTPServerListener, ref vibe.http.server.HttpServerSettings)+0xf8e) [0x8173d36]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.http.server.handleHttpConnection(vibe.core.net.TcpConnection, vibe.http.server.HTTPServerListener)+0x143) [0x8172d2f]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.http.server.listenHttpPlain(vibe.http.server.HttpServerSettings, void delegate(vibe.http.server.HttpServerRequest, vibe.http.server.HttpServerResponse)).void doListen(vibe.http.server.HttpServerSettings, vibe.http.server.HTTPServerListener, immutable(char)[]).void __lambda12(vibe.core.net.TcpConnection)+0x27) [0x8170b63]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(extern (C) nothrow void vibe.core.drivers.libevent2_tcp.onConnect(int, short, void*).void ClientTask.execute()+0x200) [0x81fda98]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void vibe.core.core.CoreTask.run()+0x5d) [0x81efe79]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(void core.thread.Fiber.run()+0x21) [0x8229e11]
/tmp/.rdmd-1000/rdmd-app.d-680553F408B240E4B699E899B567B6C1/app(fiber_entryPoint+0x4e) [0x8229d4e]
[(nil)]