Ctrl+C-ing the server at the REPL exits the process, not just the server

[yurivish]

I'm using HTTP.jl to write a little web service. Puzzlingly, Ctrl+C-ing a server started at the REPL with HTTP.serve stops not just the server but also the Julia process if the server actually served any requests. Full log of a minimal case below (The "crash" case required two ^Cs).

This is on 0.6 using the current master branch:

> julia
_
_ _ _(_)_ | A fresh approach to technical computing
(_) | (_) (_) | Documentation: https://docs.julialang.org
_ _ _| |_ __ _ | Type "?help" for help.
| | | | | | |/ _` | |
| | |_| | | | (_| | | Version 0.6.0 (2017-06-19 13:05 UTC)
_/ |\__'_|_|_|\__'_| | Official http://julialang.org/ release
|__/ | x86_64-apple-darwin13.4.0

julia> using HTTP

julia> HTTP.serve(; host=IPv4(127,0,0,1), port=8002, handler=(req, res) -> HTTP.Response("Hi"))
[HTTP - 2017-10-14T16:04:52.177]: starting server to listen on: 127.0.0.1:8002
^C[HTTP - 2017-10-14T16:04:54 ]: interrupt detected, shutting down...

julia> HTTP.serve(; host=IPv4(127,0,0,1), port=8002, handler=(req, res) -> HTTP.Response("Hi"))
[HTTP - 2017-10-14T16:04:56.181]: starting server to listen on: 127.0.0.1:8002
[HTTP - 2017-10-14T16:04:57.868]: throttling 127.0.0.1
[HTTP - 2017-10-14T16:04:57.872]: new tcp connection accepted, reading request...
[HTTP - 2017-10-14T16:04:58.102]: processing on connection i=0...
[HTTP - 2017-10-14T16:04:58.376]: throttling on connection i=0
[HTTP - 2017-10-14T16:04:58.376]: reading request bytes with readtimeout=180.0
[HTTP - 2017-10-14T16:04:59.129]: received request on connection i=0
HTTP.Request:

GET / HTTP/1.1
Connection: keep-alive
Accept-Encoding: gzip, deflate, br
Host: 127.0.0.1:8002
Cache-Control: no-cache
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Upgrade-Insecure-Requests: 1
Accept-Language: en-US,en;q=0.8,ru;q=0.6
Pragma: no-cache
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36


[HTTP - 2017-10-14T16:04:59.527]: responding with response on connection i=0
HTTP.Response:

HTTP/1.1 200 OK
Connection: keep-alive
Content-Type: text/html; charset=utf-8
Date: Sat, 14 Oct 2017 20:04:59
Content-Language: en
Server: Julia/0.6.0
Content-Length: 2

Hi
[HTTP - 2017-10-14T16:04:59.627]: throttling on connection i=0
[HTTP - 2017-10-14T16:04:59.627]: reading request bytes with readtimeout=180.0
[HTTP - 2017-10-14T16:04:59.705]: received request on connection i=0
HTTP.Request:

GET /favicon.ico HTTP/1.1
Connection: keep-alive
Referer: http://127.0.0.1:8002/
Accept-Encoding: gzip, deflate, br
Host: 127.0.0.1:8002
Cache-Control: no-cache
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Accept-Language: en-US,en;q=0.8,ru;q=0.6
Pragma: no-cache
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36


[HTTP - 2017-10-14T16:04:59.705]: responding with response on connection i=0
HTTP.Response:

HTTP/1.1 200 OK
Connection: keep-alive
Content-Type: text/html; charset=utf-8
Date: Sat, 14 Oct 2017 20:04:59
Content-Language: en
Server: Julia/0.6.0
Content-Length: 2

Hi
[HTTP - 2017-10-14T16:04:59.705]: reading request bytes with readtimeout=180.0
^CERROR (unhandled task failure): InterruptException:
Stacktrace:
[1] wait() at ./event.jl:234
[2] wait(::Condition) at ./event.jl:27
[3] stream_wait(::Timer, ::Condition, ::Vararg{Condition,N} where N) at ./stream.jl:42
[4] wait(::Timer) at ./event.jl:357
[5] sleep(::Float64) at ./event.jl:411
[6] process!(::HTTP.Nitrogen.Server{HTTP.http,HTTP.Handlers.HandlerFunction{##3#4}}, ::HTTP.Parser, ::HTTP.Request, ::Int64, ::TCPSocket, ::HTTP.Nitrogen.RateLimit, ::Base.RefValue{Float64}, ::Bool) at /Users/yurivish/.julia/v0.6/HTTP/src/server.jl:192
[7] (::HTTP.Nitrogen.##7#9{HTTP.http,Bool,HTTP.Nitrogen.RateLimit,TCPSocket,Int64,HTTP.Request,HTTP.Parser,HTTP.Nitrogen.Server{HTTP.http,HTTP.Handlers.HandlerFunction{##3#4}}})() at ./task.jl:335
^Cfatal: error thrown and no exception handler available.
InterruptException()
jl_run_once at /Users/osx/buildbot/slave/package_osx10_9-x64/build/src/jl_uv.c:132
process_events at ./libuv.jl:82 [inlined]
wait at ./event.jl:216
task_done_hook at ./task.jl:256
jlcall_task_done_hook_21956 at /Applications/Julia-0.6.app/Contents/Resources/julia/lib/julia/sys.dylib (unknown line)
jl_apply at /Users/osx/buildbot/slave/package_osx10_9-x64/build/src/./julia.h:1424 [inlined]
finish_task at /Users/osx/buildbot/slave/package_osx10_9-x64/build/src/task.c:232
start_task at /Users/osx/buildbot/slave/package_osx10_9-x64/build/src/task.c:275
> ~

[quinnj]

This is a bug in Julia itself; see JuliaLang/julia#19467

[quinnj]

Should be fixed on julia master now.