Go net/http unix domain socket connection

Question

I am having trouble connecting to my server, which listens on a Unix Domain Socket.

Go's net/http package doesn't seem to be able to use socket paths to connect to a target.

Is there a good alternative without having to create my own HTTP Protocol implementation using net?

I found lots of solutions like these, but they are unsuitable

I have tried:

_, err := http.Get("unix:///var/run/docker.sock") (changing unix to path/socket. It always complains about an unsupported protocol

You might find this link usefule: gist.github.com/teknoraver/5ffacb8757330715bcbcc90e6d46ac74 This is HTTP client and server implementation someone wrote, I checked it and it works fine, just do small changes like changing the name of the socket to /var/run/socket.sock. — E235
– E235, Commented Aug 6, 2020 at 13:23

OneOfOne · Accepted Answer · 2014-10-06 20:24:27Z

20

~~You would have to implement your own RoundTripper to support unix sockets.~~

The easiest way is probably to just use http instead of unix sockets to communicate with docker.

Edit the init script and add -H tcp://127.0.0.1:xxxx, for example:

/usr/bin/docker -H tcp://127.0.0.1:9020

You can also just fake the dial function and pass it to the transport:

func fakeDial(proto, addr string) (conn net.Conn, err error) {
    return net.Dial("unix", sock)
}

tr := &http.Transport{
    Dial: fakeDial,
}
client := &http.Client{Transport: tr}
resp, err := client.Get("http://d/test")

playground

There's only one tiny caveat, all your client.Get / .Post calls has to be a valid url (http://xxxx.xxx/path not unix://...), the domain name doesn't matter since it won't be used in connecting.

edited Oct 6, 2014 at 20:24

answered Oct 6, 2014 at 20:06

OneOfOne

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3 Comments

OneOfOne Over a year ago

@matejkramny I added a tip about just using http instead.

Matej Over a year ago

Awesome! I was going to point out you can register a protocol implementation (golang.org/pkg/net/http/#Transport.RegisterProtocol), but this is way easier! Thx

OneOfOne Over a year ago

@matejkramny using RegisterProtocol you'd have to pretty much copy/paste DefaultTransport.RoundTrip and modify it to use unix.

Nicholas · Accepted Answer · 2017-03-17 15:37:03Z

4

It's been a few years since this question was asked and answered, but I came across it while looking for the same thing. I also found the httpunix package which addresses this problem expertly.It also supports registering a new protocol so you can use native URLs such as http+unix://service-name/...... Worked quite nicely for me.

answered Mar 17, 2017 at 15:37

Nicholas

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