url: fixed encoding for slash switching emulation.

Fixes: https://github.com/joyent/node/issues/8458
Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Chris Dickinson <christopher.s.dickinson@gmail.com>

lib/url.js

@@ -111,10 +111,14 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
   }
 
   // Copy chrome, IE, opera backslash-handling behavior.
+  // Back slashes before the query string get converted to forward slashes
   // See: https://code.google.com/p/chromium/issues/detail?id=25916
-  var hashSplit = url.split('#');
+  var queryIndex = url.indexOf('?'),
-  hashSplit[0] = hashSplit[0].replace(/\\/g, '/');
+      splitter = (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
-  url = hashSplit.join('#');
+      uSplit = url.split(splitter),
+      slashRegex = /\\/g;
+  uSplit[0] = uSplit[0].replace(slashRegex, '/');
+  url = uSplit.join(splitter);
 
   var rest = url;
 
@@ -122,7 +126,7 @@ Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
   // This is to support parse stuff like "  http://foo.com  \n"
   rest = rest.trim();
 
-  if (!slashesDenoteHost && hashSplit.length === 1) {
+  if (!slashesDenoteHost && url.split('#').length === 1) {
     // Try fast path regexp
     var simplePath = simplePathPattern.exec(rest);
     if (simplePath) {

test/simple/test-url.js

@@ -45,6 +45,30 @@ var parseTests = {
     href: 'http://evil-phisher/foo.html#h%5Ca%5Cs%5Ch'
   },
 
+  'http:\\\\evil-phisher\\foo.html?json="\\"foo\\""#h\\a\\s\\h': {
+    protocol: 'http:',
+    slashes: true,
+    host: 'evil-phisher',
+    hostname: 'evil-phisher',
+    pathname: '/foo.html',
+    search: '?json=%22%5C%22foo%5C%22%22',
+    query: 'json=%22%5C%22foo%5C%22%22',
+    path: '/foo.html?json=%22%5C%22foo%5C%22%22',
+    hash: '#h%5Ca%5Cs%5Ch',
+    href: 'http://evil-phisher/foo.html?json=%22%5C%22foo%5C%22%22#h%5Ca%5Cs%5Ch'
+  },
+
+  'http:\\\\evil-phisher\\foo.html#h\\a\\s\\h?blarg': {
+    protocol: 'http:',
+    slashes: true,
+    host: 'evil-phisher',
+    hostname: 'evil-phisher',
+    pathname: '/foo.html',
+    path: '/foo.html',
+    hash: '#h%5Ca%5Cs%5Ch?blarg',
+    href: 'http://evil-phisher/foo.html#h%5Ca%5Cs%5Ch?blarg'
+  },
+
 
   'http:\\\\evil-phisher\\foo.html': {
     protocol: 'http:',