The example http server doesn't work for me. Source code:
package main
import (
"fmt"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe("127.0.0.1:8080", nil)
}
When I try to connect all I get is:
$ curl 127.0.0.1:8080
curl: (7) Failed to connect to 127.0.0.1 port 8080: Operation timed out
$ nc -v -G 5 127.0.0.1 8080
nc: connectx to 127.0.0.1 port 8080 (tcp) failed: Operation timed out
While nc tries to connect tcpdump shows only SYN packets:
$ tcpdump -i lo0 port 8080
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on lo0, link-type NULL (BSD loopback), capture size 262144 bytes
18:21:30.906638 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569352 ecr 0,sackOK,eol], length 0
18:21:31.006824 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569452 ecr 0,sackOK,eol], length 0
18:21:31.106989 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569552 ecr 0,sackOK,eol], length 0
18:21:31.208141 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569653 ecr 0,sackOK,eol], length 0
18:21:31.308288 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569753 ecr 0,sackOK,eol], length 0
18:21:31.408336 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118569853 ecr 0,sackOK,eol], length 0
18:21:31.609143 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118570053 ecr 0,sackOK,eol], length 0
18:21:32.011215 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118570453 ecr 0,sackOK,eol], length 0
18:21:32.812512 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118571253 ecr 0,sackOK,eol], length 0
18:21:34.414686 IP localhost.52799 > localhost.http-alt: Flags [S], seq 3375761924, win 65535, options [mss 16344,nop,wscale 5,nop,nop,TS val 118572853 ecr 0,sackOK,eol], length 0
And here's the last part of dtruss output of the server-side (starting from socket call):
socket(0x2, 0x1, 0x0) = 3 0
fcntl(0x3, 0x2, 0x1) = 0 0
fcntl(0x3, 0x3, 0x0) = 2 0
fcntl(0x3, 0x4, 0x6) = 0 0
setsockopt(0x3, 0xFFFF, 0x20) = 0 0
setsockopt(0x3, 0xFFFF, 0x4) = 0 0
bind(0x3, 0xC8200BA6AC, 0x10) = 0 0
listen(0x3, 0xFDE8, 0x10) = 0 0
kqueue(0x3, 0xFDE8, 0x10) = 4 0
fcntl(0x4, 0x2, 0x1) = 0 0
kevent(0x4, 0xC8200558C0, 0x2) = 0 0
getsockname(0x3, 0xC82005592C, 0xC820055928) = 0 0
accept(0x3, 0xC820055AA4, 0xC820055A94) = -1 Err#35
kevent(0x4, 0x0, 0x0) = 0 0
select(0x0, 0x0, 0x0, 0x0, 0x700000080DE8) = 0 0
Nothing more appears when I run nc, so it does not even notice connection attempts.
I don't have firewall enabled, everything else works, only Go programs have this issue (in particular I can't use docker-machine)
How do I fix it?
Edit: I assume that #Err35 is:
#define EDEADLK 35 /* Resource deadlock would occur */
...wat?
Edit2:
- go: version go1.6 darwin/amd64
- OSX: 10.11.4
The server is not exiting, it listens indefinitely.
Edit3:
I tried both "go build" and "go run - no difference
Using localhost instead of 127.0.0.1 - no difference
Using w.Write([]byte(fmt.Sprintf("Hi there, I love %s!", r.URL.Path[1:])) instead - no difference. Btw - it says nc: connectx to 127.0.0.1 port 8080 (tcp) failed: Operation timed out, so the connection attempt times out, not the read
ifconfig -a and netstat -r output: https://gist.github.com/mabn/ed171f180725b563d32bb86d5ec61988
