url: revert fix url.parse() for @hostname

This reverts commit 010cb71.

Refs: nodejs#42279

PR-URL: nodejs#42280
Fixes: nodejs#42279
Reviewed-By: Stewart X Addison <sxa@redhat.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/url.js

@@ -289,29 +289,22 @@ Url.prototype.parse = function parse(url, parseQueryString, slashesDenoteHost) {
     rest = rest.slice(proto.length);
   }
 
-  // Figure out if it's got a host.
-  // user@server is *always* interpreted as a hostname, and URL
+  // Figure out if it's got a host
+  // user@server is *always* interpreted as a hostname, and url
   // resolution will treat //foo/bar as host=foo,path=bar because that's
-  // how the browser resolves relative URLs. http:@example.com is treated
-  // the same as http://example.com.
+  // how the browser resolves relative URLs.
   let slashes;
-  let at;
   if (slashesDenoteHost || proto || hostPattern.test(rest)) {
     slashes = rest.charCodeAt(0) === CHAR_FORWARD_SLASH &&
-                  rest.charCodeAt(1) === CHAR_FORWARD_SLASH;
-    at = rest.charCodeAt(0) === CHAR_AT;
-    if (!(proto && hostlessProtocol.has(lowerProto))) {
-      if (slashes) {
-        rest = rest.slice(2);
-        this.slashes = true;
-      } else if (at) {
-        rest = rest.slice(1);
-      }
+              rest.charCodeAt(1) === CHAR_FORWARD_SLASH;
+    if (slashes && !(proto && hostlessProtocol.has(lowerProto))) {
+      rest = rest.slice(2);
+      this.slashes = true;
     }
   }
 
   if (!hostlessProtocol.has(lowerProto) &&
-      (slashes || at || (proto && !slashedProtocol.has(proto)))) {
+      (slashes || (proto && !slashedProtocol.has(proto)))) {
 
     // there's a hostname.
     // the first instance of /, ?, ;, or # ends the host.

test/parallel/test-url-parse-format.js

@@ -975,22 +975,7 @@ const parseTests = {
     query: null,
     pathname: '/everybody',
     path: '/everybody',
-    href: '//fhqwhgads@example.com/everybody#to-the-limit',
-  },
-
-  'http:@localhost': {
-    protocol: 'http:',
-    slashes: null,
-    auth: null,
-    host: 'localhost',
-    port: null,
-    hostname: 'localhost',
-    hash: null,
-    search: null,
-    query: null,
-    pathname: '/',
-    path: '/',
-    href: 'http://localhost/',
+    href: '//fhqwhgads@example.com/everybody#to-the-limit'
   },
 
   '\bhttp://example.com/\b': {