Re: [Pharo-dev] strange difference between localhost and 127.0.0.1 with a Zinc server on mac

[Ben Coman]

Luc Fabresse wrote: Hi Sven, $ telnet localhost 1701 works perfectly but I noticed that it first tries to connect to ::1 and then switch to 127.0.0.1 Trying ::1... telnet: connect to address ::1: Connection refused Trying 127.0.0.1... Connected to localhost but I suspected that curl does the same and do not fallback to 127.0.0.1 and yes this one works: curl --ipv4 http://localhost:1701 so by default my curl works on ipv6 I do not know why ::1 is before 127.0.0.1 on my mac 10.9.3. Is there a global option? in /etc/hosts 127.0.0.1 if first I've not played with IPv6 yet, but it sounds like this... http://askubuntu.com/questions/32298/prefer-a-ipv4-dns-lookups-before-aaaaipv6-lookups anyway, thanks problem solved and not related with Zinc ;-) Luc 2014-06-14 11:03 GMT+02:00 Sven Van Caekenberghe <s...@stfx.eu>: Luc, I have seen this kind of weirdness before, but I mostly see it with ab (apache benchmark tool). I really have no idea. Have you tried with telnet to do a manual HTTP request ? $ telnet localhost 1701 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. GET /random HTTP/1.1 Host:localhost:1701 HTTP/1.1 200 OK Content-Type: text/plain;charset=utf-8 Content-Length: 64 Date: Sat, 14 Jun 2014 08:58:48 GMT Server: Zinc HTTP Components 1.0 EF97C091498F3FEA3F79F65D36C40ECAFD116A68BA31F45D027DB61EBDD1579 ^] telnet> close Connection closed. You could also try using the same or a second Pharo image to do the request. $ ./pharo Pharo.image eval "ZnClient new get: 'http://localhost:8080/random'" '766EF4E6E5664EF4C5163D30125B5C35BFE2AED408835CB6D6206DF0A7A15FD ' In any case, the server socket used is normally listening on all interfaces [0.0.0.0] Sven On 14 Jun 2014, at 09:17, Luc Fabresse <luc.fabre...@gmail.com> wrote: > > > 2014-06-14 6:04 GMT+02:00 Ben Coman <b...@openinworld.com>: > Luc Fabresse wrote: >> Hi, >> >> I experiencing a strange difference between localhost and 127.0.0.1. >> >> In Pharo I do: >> >> (ZnServer startDefaultOn: 4444) >>     onRequestRespond: [ :request | ZnResponse ok: (ZnEntity text: 'hello') ] >> >> In bash: >> >> $ lsof -Pi | grep Pharo >> Pharo     2718  luc    7u  IPv4 0x1e64a2e9381f409b      0t0  TCP *:4444 (LISTEN) >> >> I perfectly listen on port 4444 from all interfaces * >> >> $ curl http://127.0.0.1:4444 >> hello >> >> $ curl http://localhost:4444 >> curl: (7) Failed to connect to localhost port 4444: Connection refused                     <- why ? >> >> localhost is correctly resolved on my mac >> $ ping localhost >> PING localhost (127.0.0.1): 56 data bytes >> 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.044 ms >> >> I tested with other programs than Zinc to open listening sockets and it works. >> >> Any idea? >> >> #Luc > maybe http://sourceforge.net/p/curl/bugs/1337/ > > Humm, I use curl 7.36.0, so yes perhaps this bug fix is not integrated... > > Anyway, I was also suspecting curl but I tested with server: Apache on port 8888 and here curl works: > > httpd     621  luc    5u  IPv6 0x6ea19c1d988f10db      0t0  TCP *:8888  <-- same as Zinc > > but both: > > curl http://127.0.0.1:8888 > curl http://localhost:8888 > > are working. > > wget always works (Apache and Zinc): > > wget -qO- http://127.0.0.1:8888 > wget -qO- http://localhost:8888 > > Thanks Max and Ben, > > Luc >