Use default ports for the schemes when dialing (#7960)

Fixes #7946

pkg/net/url.go

@@ -19,9 +19,12 @@ package net
 import (
 	"encoding/json"
 	"errors"
+	"net"
+	"net/http"
 	"net/url"
 	"path"
 	"strings"
+	"time"
 )
 
 // URL - improved JSON friendly url.URL.
@@ -79,6 +82,27 @@ func (u *URL) UnmarshalJSON(data []byte) (err error) {
 	return nil
 }
 
+// DialHTTP - dials the url to check the connection.
+func (u URL) DialHTTP() error {
+	var client = &http.Client{
+		Transport: &http.Transport{
+			DialContext: (&net.Dialer{
+				Timeout: 2 * time.Second,
+			}).DialContext,
+		},
+	}
+	req, err := http.NewRequest("POST", u.String(), nil)
+	if err != nil {
+		return err
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	resp.Body.Close()
+	return nil
+}
+
 // ParseURL - parses string into URL.
 func ParseURL(s string) (u *URL, err error) {
 	var uu *url.URL