Can cURL send requests to sockets

curlsockets

I have a HTTP server running at /var/run/my-server.sock, and I want to test it by sending a simple request using cURL. Can this be done using cURL? Can it be done at all, or must there be a reverse proxy in place?

I'm imagining something like this:

curl socket:/var/run/my-server.sock:/test/path

Best Answer

The feature was added in curl 7.40.

curl --unix-socket /var/run/docker.sock http:/images/json

Another example:

curl --no-buffer -XGET --unix-socket /docker.sock http:/events

Which specifies the GET explicitly (rather than assumed). And will not buffer (for tail -f realtime update).

(The first Ubuntu release to ship with curl 7.40 or newer was 15.10).

cURL 7.50 and up requires a valid URL to be provided, including a hostname, so to run the above examples with cURL 7.50, a "dummy" hostname has to be added, for example:

curl --unix-socket /var/run/docker.sock http://localhost/images/json

and

curl --no-buffer -XGET --unix-socket /docker.sock http://localhost/events