The Host part of the URL doesn't actually get used when we initiate c…

…onnections to UNIX domain sockets. As of golang/go#60374 (in the latest Go releases at the time of this writing), we must set it to something that looks like a hostname or requests will fail.

api/client.go

@@ -545,7 +545,7 @@ func (c *Config) ParseAddress(address string) (*url.URL, error) {
 			// be pointing to the protocol used in the application layer and not to
 			// the transport layer. Hence, setting the fields accordingly.
 			u.Scheme = "http"
-			u.Host = socket
+			u.Host = "localhost"
 			u.Path = ""
 		} else {
 			return nil, fmt.Errorf("attempting to specify unix:// address with non-transport transport")