Add the ProxyPath

nats.go

@@ -467,6 +467,10 @@ type Options struct {
 	// supports compression. If the server does too, then data will be compressed.
 	Compression bool
 
+	// For websocket connections, adds a path to connections url.
+	// This is useful when connecting to NATS behind a proxy.
+	ProxyPath string
+
 	// InboxPrefix allows the default _INBOX prefix to be customized
 	InboxPrefix string
 }
@@ -1147,6 +1151,15 @@ func Compression(enabled bool) Option {
 	}
 }
 
+// ProxyPath is an option for websocket connections that adds a path to connections url.
+// This is useful when connecting to NATS behind a proxy.
+func ProxyPath(path string) Option {
+	return func(o *Options) error {
+		o.ProxyPath = path
+		return nil
+	}
+}
+
 // CustomInboxPrefix configures the request + reply inbox prefix
 func CustomInboxPrefix(p string) Option {
 	return func(o *Options) error {

ws.go

@@ -570,6 +570,15 @@ func (nc *Conn) wsInitHandshake(u *url.URL) error {
 		scheme = "https"
 	}
 	ustr := fmt.Sprintf("%s://%s", scheme, u.Host)
+
+	if nc.Opts.ProxyPath != "" {
+		proxyPath := nc.Opts.ProxyPath
+		if !strings.HasPrefix(proxyPath, "/") {
+			proxyPath = "/" + proxyPath
+		}
+		ustr += proxyPath
+	}
+
 	u, err = url.Parse(ustr)
 	if err != nil {
 		return err