diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f4711d4
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node:
+          - 12
+          - 14
+          - 16
+          - 17
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node }}
+      - run: npm install
+      - run: npm test
+      - uses: coverallsapp/github-action@1.1.3
+        if: matrix.node == 12
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+  test-browser:
+    runs-on: ubuntu-latest
+    env:
+      SAUCE_USERNAME: url-parse
+      SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run test-browser
diff --git a/.gitignore b/.gitignore
index dd5fe6b..eec701f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,4 @@
 node_modules/
-.nyc_output/
 coverage/
 dist/
-npm-debug.log
 .tern-port
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..43c97e7
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+package-lock=false
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 790ec10..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-sudo: false
-language: node_js
-matrix:
-  fast_finish: true
-  include:
-    - node_js: "10"
-      env: SCRIPT=test
-    - node_js: "8"
-      env: SCRIPT=test
-    - node_js: "6"
-      env: SCRIPT=test
-    - node_js: "8"
-      env:
-        - secure: IF01oyIKSs0C5dARdYRTilKnU1TG4zenjjEPClkQxAWIpUOxl9xcNJWDVEOPxJ/4pVt+pozyT80Rp7efh6ZiREJIQI1tUboBKSqZzSbnD5uViQNSbQ90PaDP0FIUc0IQ5o07W36rijBB0DTmtU1VofzN9PKkJO7XiSSXevI8RcM=
-        - SAUCE_USERNAME=url-parse
-        - SCRIPT=test-browser
-script:
-  - "npm run ${SCRIPT}"
-after_script:
-  - 'if [ "${SCRIPT}" == "test" ]; then npm i coveralls@3 && cat coverage/lcov.info | coveralls; fi'
-notifications:
-  irc:
-    channels:
-      - "irc.freenode.org#unshift"
-    on_success: change
-    on_failure: change
diff --git a/README.md b/README.md
index f81f919..e5bf8d7 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,15 @@
 # url-parse
 
-[![Made by unshift](https://img.shields.io/badge/made%20by-unshift-00ffcc.svg?style=flat-square)](http://unshift.io)[![Version npm](https://img.shields.io/npm/v/url-parse.svg?style=flat-square)](https://www.npmjs.com/package/url-parse)[![Build Status](https://img.shields.io/travis/unshiftio/url-parse/master.svg?style=flat-square)](https://travis-ci.org/unshiftio/url-parse)[![Dependencies](https://img.shields.io/david/unshiftio/url-parse.svg?style=flat-square)](https://david-dm.org/unshiftio/url-parse)[![Coverage Status](https://img.shields.io/coveralls/unshiftio/url-parse/master.svg?style=flat-square)](https://coveralls.io/r/unshiftio/url-parse?branch=master)[![IRC channel](https://img.shields.io/badge/IRC-irc.freenode.net%23unshift-00a8ff.svg?style=flat-square)](https://webchat.freenode.net/?channels=unshift)
+[![Version npm](https://img.shields.io/npm/v/url-parse.svg?style=flat-square)](https://www.npmjs.com/package/url-parse)[![Build Status](https://img.shields.io/github/workflow/status/unshiftio/url-parse/CI/master?label=CI&style=flat-square)](https://github.com/unshiftio/url-parse/actions?query=workflow%3ACI+branch%3Amaster)[![Coverage Status](https://img.shields.io/coveralls/unshiftio/url-parse/master.svg?style=flat-square)](https://coveralls.io/r/unshiftio/url-parse?branch=master)
 
 [![Sauce Test Status](https://saucelabs.com/browser-matrix/url-parse.svg)](https://saucelabs.com/u/url-parse)
 
+**`url-parse` was created in 2014 when the WHATWG URL API was not available in
+Node.js and the `URL` interface was supported only in some browsers. Today this
+is no longer true. The `URL` interface is available in all supported Node.js
+release lines and basically all browsers. Consider using it for better security
+and accuracy.**
+
 The `url-parse` method exposes two different API interfaces. The
 [`url`](https://nodejs.org/api/url.html) interface that you know from Node.js
 and the new [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL/URL)
@@ -80,8 +86,8 @@ The returned `url` instance contains the following properties:
 - `auth`: Authentication information portion (e.g. `username:password`).
 - `username`: Username of basic authentication.
 - `password`: Password of basic authentication.
-- `host`: Host name with port number.
-- `hostname`: Host name without port number.
+- `host`: Host name with port number. The hostname might be invalid.
+- `hostname`: Host name without port number. This might be an invalid hostname.
 - `port`: Optional port number.
 - `pathname`: URL path.
 - `query`: Parsed object containing query string, unless parsing is set to false.
diff --git a/SECURITY.md b/SECURITY.md
index a1c3d63..f642347 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -33,13 +33,82 @@ acknowledge your responsible disclosure, if you wish.
 
 ## History
 
+> Leading control characters are not removed. This allows an attacker to bypass
+> hostname checks and makes the `extractProtocol` method return false positives.
+
+- **Reporter credits**
+  - Haxatron
+  - GitHub: [@haxatron](https://github.com/haxatron)
+  - Twitter: [@haxatron1](https://twitter.com/haxatron1)
+- Huntr report: https://www.huntr.dev/bounties/57124ed5-4b68-4934-8325-2c546257f2e4/
+- Fixed in: 1.5.9
+
+---
+
+> A URL with a specified but empty port can be used to bypass authorization
+> checks.
+
+- **Reporter credits**
+  - Rohan Sharma
+  - GitHub: [@r0hansh](https://github.com/r0hansh)
+- Huntr report: https://www.huntr.dev/bounties/55fd06cd-9054-4d80-83be-eb5a454be78c/
+- Fixed in: 1.5.8
+
+---
+
+> A specially crafted URL with empty userinfo and no host can be used to bypass
+> authorization checks.
+
+- **Reporter credits**
+  - Haxatron
+  - GitHub: [@haxatron](https://github.com/haxatron)
+  - Twitter: [@haxatron1](https://twitter.com/haxatron1)
+- Huntr report: https://www.huntr.dev/bounties/83a6bc9a-b542-4a38-82cd-d995a1481155/
+- Fixed in: 1.5.7
+
+---
+
+> Incorrect handling of username and password can lead to authorization bypass.
+
+- **Reporter credits**
+  - ranjit-git
+  - GitHub: [@ranjit-git](https://github.com/ranjit-git)
+- Huntr report: https://www.huntr.dev/bounties/6d1bc51f-1876-4f5b-a2c2-734e09e8e05b/
+- Fixed in: 1.5.6
+
+---
+
+> url-parse mishandles certain uses of a single (back) slash such as https:\ &
+> https:/ and interprets the URI as a relative path. Browsers accept a single
+> backslash after the protocol, and treat it as a normal slash, while url-parse
+> sees it as a relative path.
+
+- **Reporter credits**
+  - ready-research
+  - GitHub: [@ready-research](https://github.com/ready-research)
+- Huntr report: https://www.huntr.dev/bounties/1625557993985-unshiftio/url-parse/
+- Fixed in: 1.5.2
+
+---
+
+> Using backslash in the protocol is valid in the browser, while url-parse
+> thinks it’s a relative path. An application that validates a url using
+> url-parse might pass a malicious link.
+
+- **Reporter credits**
+  - CxSCA AppSec team at Checkmarx.
+  - Twitter: [Yaniv Nizry](https://twitter.com/ynizry)
+- Fixed in: 1.5.0
+
+---
+
 > The `extractProtocol` method does not return the correct protocol when
 > provided with unsanitized content which could lead to false positives.
 
 - **Reporter credits**
   - Reported through our security email & Twitter interaction.
   - Twitter: [@ronperris](https://twitter.com/ronperris)
-  - Fixed in: 1.4.5
+- Fixed in: 1.4.5
 
 ---
 
diff --git a/index.js b/index.js
index 9e58eda..b86c29f 100644
--- a/index.js
+++ b/index.js
@@ -2,19 +2,23 @@
 
 var required = require('requires-port')
   , qs = require('querystringify')
+  , controlOrWhitespace = /^[\x00-\x20\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]+/
+  , CRHTLF = /[\n\r\t]/g
   , slashes = /^[A-Za-z][A-Za-z0-9+-.]*:\/\//
-  , protocolre = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\S\s]*)/i
-  , whitespace = '[\\x09\\x0A\\x0B\\x0C\\x0D\\x20\\xA0\\u1680\\u180E\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200A\\u202F\\u205F\\u3000\\u2028\\u2029\\uFEFF]'
-  , left = new RegExp('^'+ whitespace +'+');
+  , port = /:\d+$/
+  , protocolre = /^([a-z][a-z0-9.+-]*:)?(\/\/)?([\\/]+)?([\S\s]*)/i
+  , windowsDriveLetter = /^[a-zA-Z]:/;
 
 /**
- * Trim a given string.
+ * Remove control characters and whitespace from the beginning of a string.
  *
- * @param {String} str String to trim.
+ * @param {Object|String} str String to trim.
+ * @returns {String} A new string representing `str` stripped of control
+ *     characters and whitespace from its beginning.
  * @public
  */
 function trimLeft(str) {
-  return (str ? str : '').toString().replace(left, '');
+  return (str ? str : '').toString().replace(controlOrWhitespace, '');
 }
 
 /**
@@ -32,13 +36,13 @@ function trimLeft(str) {
 var rules = [
   ['#', 'hash'],                        // Extract from the back.
   ['?', 'query'],                       // Extract from the back.
-  function sanitize(address) {          // Sanitize what is left of the address
-    return address.replace('\\', '/');
+  function sanitize(address, url) {     // Sanitize what is left of the address
+    return isSpecial(url.protocol) ? address.replace(/\\/g, '/') : address;
   },
   ['/', 'pathname'],                    // Extract from the back.
   ['@', 'auth', 1],                     // Extract from the front.
   [NaN, 'host', undefined, 1, 1],       // Set left over value.
-  [/:(\d+)$/, 'port', undefined, 1],    // RegExp the back.
+  [/:(\d*)$/, 'port', undefined, 1],    // RegExp the back.
   [NaN, 'hostname', undefined, 1, 1]    // Set left over.
 ];
 
@@ -98,6 +102,24 @@ function lolcation(loc) {
   return finaldestination;
 }
 
+/**
+ * Check whether a protocol scheme is special.
+ *
+ * @param {String} The protocol scheme of the URL
+ * @return {Boolean} `true` if the protocol scheme is special, else `false`
+ * @private
+ */
+function isSpecial(scheme) {
+  return (
+    scheme === 'file:' ||
+    scheme === 'ftp:' ||
+    scheme === 'http:' ||
+    scheme === 'https:' ||
+    scheme === 'ws:' ||
+    scheme === 'wss:'
+  );
+}
+
 /**
  * @typedef ProtocolExtract
  * @type Object
@@ -110,17 +132,58 @@ function lolcation(loc) {
  * Extract protocol information from a URL with/without double slash ("//").
  *
  * @param {String} address URL we want to extract from.
+ * @param {Object} location
  * @return {ProtocolExtract} Extracted information.
  * @private
  */
-function extractProtocol(address) {
+function extractProtocol(address, location) {
   address = trimLeft(address);
+  address = address.replace(CRHTLF, '');
+  location = location || {};
+
   var match = protocolre.exec(address);
+  var protocol = match[1] ? match[1].toLowerCase() : '';
+  var forwardSlashes = !!match[2];
+  var otherSlashes = !!match[3];
+  var slashesCount = 0;
+  var rest;
+
+  if (forwardSlashes) {
+    if (otherSlashes) {
+      rest = match[2] + match[3] + match[4];
+      slashesCount = match[2].length + match[3].length;
+    } else {
+      rest = match[2] + match[4];
+      slashesCount = match[2].length;
+    }
+  } else {
+    if (otherSlashes) {
+      rest = match[3] + match[4];
+      slashesCount = match[3].length;
+    } else {
+      rest = match[4]
+    }
+  }
+
+  if (protocol === 'file:') {
+    if (slashesCount >= 2) {
+      rest = rest.slice(2);
+    }
+  } else if (isSpecial(protocol)) {
+    rest = match[4];
+  } else if (protocol) {
+    if (forwardSlashes) {
+      rest = rest.slice(2);
+    }
+  } else if (slashesCount >= 2 && isSpecial(location.protocol)) {
+    rest = match[4];
+  }
 
   return {
-    protocol: match[1] ? match[1].toLowerCase() : '',
-    slashes: !!match[2],
-    rest: match[3]
+    protocol: protocol,
+    slashes: forwardSlashes || isSpecial(protocol),
+    slashesCount: slashesCount,
+    rest: rest
   };
 }
 
@@ -176,6 +239,7 @@ function resolve(relative, base) {
  */
 function Url(address, location, parser) {
   address = trimLeft(address);
+  address = address.replace(CRHTLF, '');
 
   if (!(this instanceof Url)) {
     return new Url(address, location, parser);
@@ -210,7 +274,7 @@ function Url(address, location, parser) {
   //
   // Extract protocol information before running the instructions.
   //
-  extracted = extractProtocol(address || '');
+  extracted = extractProtocol(address || '', location);
   relative = !extracted.protocol && !extracted.slashes;
   url.slashes = extracted.slashes || relative && location.slashes;
   url.protocol = extracted.protocol || location.protocol || '';
@@ -220,13 +284,22 @@ function Url(address, location, parser) {
   // When the authority component is absent the URL starts with a path
   // component.
   //
-  if (!extracted.slashes) instructions[3] = [/(.*)/, 'pathname'];
+  if (
+    extracted.protocol === 'file:' && (
+      extracted.slashesCount !== 2 || windowsDriveLetter.test(address)) ||
+    (!extracted.slashes &&
+      (extracted.protocol ||
+        extracted.slashesCount < 2 ||
+        !isSpecial(url.protocol)))
+  ) {
+    instructions[3] = [/(.*)/, 'pathname'];
+  }
 
   for (; i < instructions.length; i++) {
     instruction = instructions[i];
 
     if (typeof instruction === 'function') {
-      address = instruction(address);
+      address = instruction(address, url);
       continue;
     }
 
@@ -236,7 +309,11 @@ function Url(address, location, parser) {
     if (parse !== parse) {
       url[key] = address;
     } else if ('string' === typeof parse) {
-      if (~(index = address.indexOf(parse))) {
+      index = parse === '@'
+        ? address.lastIndexOf(parse)
+        : address.indexOf(parse);
+
+      if (~index) {
         if ('number' === typeof instruction[2]) {
           url[key] = address.slice(0, index);
           address = address.slice(index + instruction[2]);
@@ -280,6 +357,14 @@ function Url(address, location, parser) {
     url.pathname = resolve(url.pathname, location.pathname);
   }
 
+  //
+  // Default to a / for pathname if none exists. This normalizes the URL
+  // to always have a /
+  //
+  if (url.pathname.charAt(0) !== '/' && isSpecial(url.protocol)) {
+    url.pathname = '/' + url.pathname;
+  }
+
   //
   // We should not add port numbers if they are already the default port number
   // for a given protocol. As the host also contains the port number we're going
@@ -294,13 +379,24 @@ function Url(address, location, parser) {
   // Parse down the `auth` for the username and password.
   //
   url.username = url.password = '';
+
   if (url.auth) {
-    instruction = url.auth.split(':');
-    url.username = instruction[0] || '';
-    url.password = instruction[1] || '';
+    index = url.auth.indexOf(':');
+
+    if (~index) {
+      url.username = url.auth.slice(0, index);
+      url.username = encodeURIComponent(decodeURIComponent(url.username));
+
+      url.password = url.auth.slice(index + 1);
+      url.password = encodeURIComponent(decodeURIComponent(url.password))
+    } else {
+      url.username = encodeURIComponent(decodeURIComponent(url.auth));
+    }
+
+    url.auth = url.password ? url.username +':'+ url.password : url.username;
   }
 
-  url.origin = url.protocol && url.host && url.protocol !== 'file:'
+  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
     ? url.protocol +'//'+ url.host
     : 'null';
 
@@ -357,7 +453,7 @@ function set(part, value, fn) {
     case 'host':
       url[part] = value;
 
-      if (/:\d+$/.test(value)) {
+      if (port.test(value)) {
         value = value.split(':');
         url.port = value.pop();
         url.hostname = value.join(':');
@@ -383,8 +479,23 @@ function set(part, value, fn) {
       }
       break;
 
-    default:
-      url[part] = value;
+    case 'username':
+    case 'password':
+      url[part] = encodeURIComponent(value);
+      break;
+
+    case 'auth':
+      var index = value.indexOf(':');
+
+      if (~index) {
+        url.username = value.slice(0, index);
+        url.username = encodeURIComponent(decodeURIComponent(url.username));
+
+        url.password = value.slice(index + 1);
+        url.password = encodeURIComponent(decodeURIComponent(url.password));
+      } else {
+        url.username = encodeURIComponent(decodeURIComponent(value));
+      }
   }
 
   for (var i = 0; i < rules.length; i++) {
@@ -393,7 +504,9 @@ function set(part, value, fn) {
     if (ins[4]) url[ins[1]] = url[ins[1]].toLowerCase();
   }
 
-  url.origin = url.protocol && url.host && url.protocol !== 'file:'
+  url.auth = url.password ? url.username +':'+ url.password : url.username;
+
+  url.origin = url.protocol !== 'file:' && isSpecial(url.protocol) && url.host
     ? url.protocol +'//'+ url.host
     : 'null';
 
@@ -414,19 +527,45 @@ function toString(stringify) {
 
   var query
     , url = this
+    , host = url.host
     , protocol = url.protocol;
 
   if (protocol && protocol.charAt(protocol.length - 1) !== ':') protocol += ':';
 
-  var result = protocol + (url.slashes ? '//' : '');
+  var result =
+    protocol +
+    ((url.protocol && url.slashes) || isSpecial(url.protocol) ? '//' : '');
 
   if (url.username) {
     result += url.username;
     if (url.password) result += ':'+ url.password;
     result += '@';
+  } else if (url.password) {
+    result += ':'+ url.password;
+    result += '@';
+  } else if (
+    url.protocol !== 'file:' &&
+    isSpecial(url.protocol) &&
+    !host &&
+    url.pathname !== '/'
+  ) {
+    //
+    // Add back the empty userinfo, otherwise the original invalid URL
+    // might be transformed into a valid one with `url.pathname` as host.
+    //
+    result += '@';
+  }
+
+  //
+  // Trailing colon is removed from `url.host` when it is parsed. If it still
+  // ends with a colon, then add back the trailing colon that was removed. This
+  // prevents an invalid URL from being transformed into a valid one.
+  //
+  if (host[host.length - 1] === ':' || (port.test(url.hostname) && !url.port)) {
+    host += ':';
   }
 
-  result += url.host + url.pathname;
+  result += host + url.pathname;
 
   query = 'object' === typeof url.query ? stringify(url.query) : url.query;
   if (query) result += '?' !== query.charAt(0) ? '?'+ query : query;
diff --git a/package.json b/package.json
index 2d9ce79..8d1bbbe 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,12 @@
 {
   "name": "url-parse",
-  "version": "1.4.7",
+  "version": "1.5.10",
   "description": "Small footprint URL parser that works seamlessly across Node.js and browser environments",
   "main": "index.js",
   "scripts": {
     "browserify": "rm -rf dist && mkdir -p dist && browserify index.js -s URLParse -o dist/url-parse.js",
     "minify": "uglifyjs dist/url-parse.js --source-map -cm -o dist/url-parse.min.js",
-    "test": "nyc --reporter=html --reporter=text mocha test/test.js",
+    "test": "c8 --reporter=lcov --reporter=text mocha test/test.js",
     "test-browser": "node test/browser.js",
     "prepublishOnly": "npm run browserify && npm run minify",
     "watch": "mocha --watch test/test.js"
@@ -38,9 +38,9 @@
   },
   "devDependencies": {
     "assume": "^2.2.0",
-    "browserify": "^16.2.3",
-    "mocha": "^6.1.4",
-    "nyc": "^14.0.0",
+    "browserify": "^17.0.0",
+    "c8": "^7.3.1",
+    "mocha": "^9.0.3",
     "pre-commit": "^1.2.2",
     "sauce-browsers": "^2.0.0",
     "sauce-test": "^1.3.3",
diff --git a/test/browser.js b/test/browser.js
index 8cc3203..63ee99b 100644
--- a/test/browser.js
+++ b/test/browser.js
@@ -12,8 +12,8 @@ const platforms = sauceBrowsers([
   { name: 'firefox', version: ['oldest', 'latest'] },
   { name: 'internet explorer', version: 'oldest..latest' },
   { name: 'iphone', version: ['oldest', 'latest'] },
-  { name: 'safari', version: 'oldest..latest' },
-  { name: 'microsoftedge', version: 'oldest..latest' }
+  { name: 'safari', version: ['oldest', 'latest'] },
+  { name: 'microsoftedge', version: ['oldest', 'latest'] }
 ]).then((platforms) => {
   return platforms.map((platform) => {
     const ret = {
@@ -29,12 +29,12 @@ const platforms = sauceBrowsers([
 });
 
 run(path.join(__dirname, 'test.js'), 'saucelabs', {
+  jobInfo: { name: pkg.name, build: process.env.GITHUB_RUN_ID },
   html: path.join(__dirname, 'index.html'),
   accessKey: process.env.SAUCE_ACCESS_KEY,
   username: process.env.SAUCE_USERNAME,
   browserify: true,
   disableSSL: true,
-  name: pkg.name,
   parallel: 5,
   platforms
 }).done((results) => {
diff --git a/test/fuzzy.js b/test/fuzzy.js
index f0990d3..6052040 100644
--- a/test/fuzzy.js
+++ b/test/fuzzy.js
@@ -103,6 +103,8 @@ module.exports = function generate() {
     , key;
 
   spec.protocol = get('protocol');
+  spec.slashes = true;
+  
   spec.hostname = get('hostname');
   spec.pathname = get('pathname');
 
diff --git a/test/test.js b/test/test.js
index 977fa3c..4108fe6 100644
--- a/test/test.js
+++ b/test/test.js
@@ -47,8 +47,14 @@ describe('url-parse', function () {
       assume(parse.trimLeft).is.a('function');
     });
 
-    it('removes whitespace on the left', function () {
-      assume(parse.trimLeft('  lol')).equals('lol');
+    it('removes control characters on the left', function () {
+      var i = 0;
+      var prefix = ''
+
+      for (; i < 33; i++) {
+        prefix = String.fromCharCode(i);
+        assume(parse.trimLeft(prefix + prefix +'lol')).equals('lol');
+      }
     });
 
     it('calls toString on a given value', function () {
@@ -71,7 +77,8 @@ describe('url-parse', function () {
       assume(parse.extractProtocol('http://example.com')).eql({
         slashes: true,
         protocol: 'http:',
-        rest: 'example.com'
+        rest: 'example.com',
+        slashesCount: 2
       });
     });
 
@@ -79,25 +86,53 @@ describe('url-parse', function () {
       assume(parse.extractProtocol('')).eql({
         slashes: false,
         protocol: '',
-        rest: ''
+        rest: '',
+        slashesCount: 0
+      });
+    });
+
+    it('correctly resolves paths', function () {
+      assume(parse.extractProtocol('/foo')).eql({
+        slashes: false,
+        protocol: '',
+        rest: '/foo',
+        slashesCount: 1
+      });
+
+      assume(parse.extractProtocol('//foo/bar')).eql({
+        slashes: true,
+        protocol: '',
+        rest: '//foo/bar',
+        slashesCount: 2
       });
     });
 
     it('does not truncate the input string', function () {
-      var input = 'foo\nbar\rbaz\u2028qux\u2029';
+      var input = 'foo\x0bbar\x0cbaz\u2028qux\u2029';
 
       assume(parse.extractProtocol(input)).eql({
         slashes: false,
         protocol: '',
-        rest: input
+        rest: input,
+        slashesCount: 0
       });
     });
 
     it('trimsLeft', function () {
-      assume(parse.extractProtocol(' javascript://foo')).eql({
+      assume(parse.extractProtocol('\x0b\x0c javascript://foo')).eql({
         slashes: true,
         protocol: 'javascript:',
-        rest: 'foo'
+        rest: 'foo',
+        slashesCount: 2
+      });
+    });
+
+    it('removes CR, HT, and LF', function () {
+      assume(parse.extractProtocol('jav\n\rasc\nript\r:/\t/fo\no')).eql({
+        slashes: true,
+        protocol: 'javascript:',
+        rest: 'foo',
+        slashesCount: 2
       });
     });
   });
@@ -190,9 +225,10 @@ describe('url-parse', function () {
       , parsed = parse(url);
 
     assume(parsed.port).equals('');
+    assume(parsed.pathname).equals('/');
     assume(parsed.host).equals('example.com');
     assume(parsed.hostname).equals('example.com');
-    assume(parsed.href).equals('http://example.com');
+    assume(parsed.href).equals('http://example.com/');
   });
 
   it('understands an / as pathname', function () {
@@ -208,6 +244,20 @@ describe('url-parse', function () {
     assume(parsed.href).equals('http://example.com/');
   });
 
+  it('correctly parses pathnames for relative paths', function () {
+    var url = '/dataApi/PROD/ws'
+     , parsed = parse(url, 'http://localhost:3000/PROD/trends');
+
+    assume(parsed.pathname).equals('/dataApi/PROD/ws');
+
+    url = '/sections/?project=default'
+    parsed = parse(url, 'http://example.com/foo/bar');
+
+    assume(parsed.pathname).equals('/sections/');
+    assume(parsed.hostname).equals('example.com');
+    assume(parsed.href).equals('http://example.com/sections/?project=default');
+  });
+
   it('does not care about spaces', function () {
     var url = 'http://x.com/path?that\'s#all, folks'
       , parsed = parse(url);
@@ -242,16 +292,202 @@ describe('url-parse', function () {
     assume(parsed.hostname).equals('google.com');
     assume(parsed.hash).equals('#what\\is going on');
 
-    parsed = parse('//\\what-is-up.com');
+    parsed = parse('http://yolo.com\\what-is-up.com');
     assume(parsed.pathname).equals('/what-is-up.com');
   });
 
   it('correctly ignores multiple slashes //', function () {
     var url = '////what-is-up.com'
+      , parsed = parse(url, parse('http://google.com'));
+
+    assume(parsed.host).equals('what-is-up.com');
+    assume(parsed.href).equals('http://what-is-up.com/');
+
+    url = '\\\\\\\\what-is-up.com'
+    parsed = parse(url, parse('http://google.com'));
+
+    assume(parsed.host).equals('what-is-up.com');
+    assume(parsed.href).equals('http://what-is-up.com/');
+  });
+
+  it('ignores slashes after the protocol for special URLs', function () {
+    var url = 'https:\\/github.com/foo/bar'
+      , parsed = parse(url);
+
+    assume(parsed.host).equals('github.com');
+    assume(parsed.hostname).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+
+    url = 'https:/\\/\\/\\github.com/foo/bar';
+    parsed = parse(url);
+    assume(parsed.host).equals('github.com');
+    assume(parsed.hostname).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+
+    url = 'https:/github.com/foo/bar';
+    parsed = parse(url);
+    assume(parsed.host).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+
+    url = 'https:\\github.com/foo/bar';
+    parsed = parse(url);
+    assume(parsed.host).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+
+    url = 'https:github.com/foo/bar';
+    parsed = parse(url);
+    assume(parsed.host).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+
+    url = 'https:github.com/foo/bar';
+    parsed = parse(url);
+    assume(parsed.host).equals('github.com');
+    assume(parsed.pathname).equals('/foo/bar');
+    assume(parsed.slashes).is.true();
+    assume(parsed.href).equals('https://github.com/foo/bar');
+  });
+
+  it('handles slashes after the protocol for non special URLs', function () {
+    var url = 'foo:example.com'
       , parsed = parse(url);
 
-    assume(parsed.host).equals('');
     assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('example.com');
+    assume(parsed.href).equals('foo:example.com');
+    assume(parsed.slashes).is.false();
+
+    url = 'foo:/example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('/example.com');
+    assume(parsed.href).equals('foo:/example.com');
+    assume(parsed.slashes).is.false();
+
+    url = 'foo:\\example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('\\example.com');
+    assume(parsed.href).equals('foo:\\example.com');
+    assume(parsed.slashes).is.false();
+
+    url = 'foo://example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('example.com');
+    assume(parsed.pathname).equals('');
+    assume(parsed.href).equals('foo://example.com');
+    assume(parsed.slashes).is.true();
+
+    url = 'foo:\\\\example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('\\\\example.com');
+    assume(parsed.href).equals('foo:\\\\example.com');
+    assume(parsed.slashes).is.false();
+
+    url = 'foo:///example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('/example.com');
+    assume(parsed.href).equals('foo:///example.com');
+    assume(parsed.slashes).is.true();
+
+    url = 'foo:\\\\\\example.com';
+    parsed = parse(url);
+    assume(parsed.hostname).equals('');
+    assume(parsed.pathname).equals('\\\\\\example.com');
+    assume(parsed.href).equals('foo:\\\\\\example.com');
+    assume(parsed.slashes).is.false();
+
+    url = '\\\\example.com/foo/bar';
+    parsed = parse(url, 'foo://bar.com');
+    assume(parsed.hostname).equals('bar.com');
+    assume(parsed.pathname).equals('/\\\\example.com/foo/bar');
+    assume(parsed.href).equals('foo://bar.com/\\\\example.com/foo/bar');
+    assume(parsed.slashes).is.true();
+  });
+
+  it('does not readd slashes to href if there is no protocol', function() {
+    var parsed = parse('//example.com', {});
+
+    assume(parsed.pathname).equals('//example.com');
+    assume(parsed.href).equals('//example.com');
+  });
+
+  it('removes CR, HT, and LF', function () {
+    var parsed = parse(
+      'ht\ntp://a\rb:\tcd@exam\rple.com:80\t80/pat\thname?fo\no=b\rar#ba\tz'
+    );
+
+    assume(parsed.protocol).equals('http:');
+    assume(parsed.username).equals('ab');
+    assume(parsed.password).equals('cd');
+    assume(parsed.host).equals('example.com:8080');
+    assume(parsed.hostname).equals('example.com');
+    assume(parsed.port).equals('8080');
+    assume(parsed.pathname).equals('/pathname');
+    assume(parsed.query).equals('?foo=bar');
+    assume(parsed.hash).equals('#baz');
+    assume(parsed.href).equals(
+      'http://ab:cd@example.com:8080/pathname?foo=bar#baz'
+    );
+
+    parsed = parse('s\nip:al\rice@atl\tanta.com');
+
+    assume(parsed.protocol).equals('sip:');
+    assume(parsed.pathname).equals('alice@atlanta.com');
+    assume(parsed.href).equals('sip:alice@atlanta.com');
+  });
+
+  it('handles the case where the port is specified but empty', function () {
+    var parsed = parse('http://example.com:');
+
+    assume(parsed.protocol).equals('http:');
+    assume(parsed.port).equals('');
+    assume(parsed.host).equals('example.com');
+    assume(parsed.hostname).equals('example.com');
+    assume(parsed.pathname).equals('/');
+    assume(parsed.origin).equals('http://example.com');
+    assume(parsed.href).equals('http://example.com/');
+
+    parsed = parse('http://example.com::');
+
+    assume(parsed.protocol).equals('http:');
+    assume(parsed.port).equals('');
+    assume(parsed.host).equals('example.com:');
+    assume(parsed.hostname).equals('example.com:');
+    assume(parsed.pathname).equals('/');
+    assume(parsed.origin).equals('http://example.com:');
+    assume(parsed.href).equals('http://example.com::/');
+
+    parsed = parse('http://example.com:8080:');
+
+    assume(parsed.protocol).equals('http:');
+    assume(parsed.port).equals('');
+    assume(parsed.host).equals('example.com:8080');
+    assume(parsed.hostname).equals('example.com:8080');
+    assume(parsed.pathname).equals('/');
+    assume(parsed.origin).equals('http://example.com:8080');
+    assume(parsed.href).equals('http://example.com:8080:/');
+
+    parsed = parse('http://example.com:8000:8080');
+
+    assume(parsed.protocol).equals('http:');
+    assume(parsed.port).equals('8080');
+    assume(parsed.host).equals('example.com:8000:8080');
+    assume(parsed.hostname).equals('example.com:8000');
+    assume(parsed.pathname).equals('/');
+    assume(parsed.origin).equals('http://example.com:8000:8080');
+    assume(parsed.href).equals('http://example.com:8000:8080/');
   });
 
   describe('origin', function () {
@@ -276,6 +512,13 @@ describe('url-parse', function () {
       assume(parsed.origin).equals('null');
     });
 
+    it('is null for non special URLs', function () {
+      var o = parse('foo://example.com/pathname');
+      assume(o.hostname).equals('example.com');
+      assume(o.pathname).equals('/pathname');
+      assume(o.origin).equals('null');
+    });
+
     it('removes default ports for http', function () {
       var o = parse('http://google.com:80/pathname');
       assume(o.origin).equals('http://google.com');
@@ -327,32 +570,52 @@ describe('url-parse', function () {
     it('extracts the right protocol from a url', function () {
       var testData = [
         {
-          href: 'http://example.com',
+          href: 'http://example.com/',
           protocol: 'http:',
-          pathname: ''
+          pathname: '/',
+          slashes: true
+        },
+        {
+          href: 'ws://example.com/',
+          protocol: 'ws:',
+          pathname: '/',
+          slashes: true
+        },
+        {
+          href: 'wss://example.com/',
+          protocol: 'wss:',
+          pathname: '/',
+          slashes: true
         },
         {
           href: 'mailto:test@example.com',
           pathname: 'test@example.com',
-          protocol: 'mailto:'
+          protocol: 'mailto:',
+          slashes: false
         },
         {
           href: 'data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E',
           pathname: 'text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E',
-          protocol: 'data:'
+          protocol: 'data:',
+          slashes: false,
         },
         {
           href: 'sip:alice@atlanta.com',
           pathname: 'alice@atlanta.com',
-          protocol: 'sip:'
+          protocol: 'sip:',
+          slashes: false,
         }
       ];
 
-      var data;
+      var data, test;
       for (var i = 0, len = testData.length; i < len; ++i) {
-        data = parse(testData[i].href);
-        assume(data.protocol).equals(testData[i].protocol);
-        assume(data.pathname).equals(testData[i].pathname);
+        test = testData[i];
+        data = parse(test.href);
+
+        assume(data.protocol).equals(test.protocol);
+        assume(data.pathname).equals(test.pathname);
+        assume(data.slashes).equals(test.slashes);
+        assume(data.href).equals(test.href);
       }
     });
 
@@ -375,6 +638,67 @@ describe('url-parse', function () {
       data.set('protocol', 'https:');
       assume(data.href).equals('https://google.com/foo');
     });
+
+    it('handles the file: protocol', function () {
+      var slashes = ['', '/', '//', '///'];
+      var data;
+      var url;
+
+      for (var i = 0; i < slashes.length; i++) {
+        data = parse('file:' + slashes[i]);
+        assume(data.protocol).equals('file:');
+        assume(data.pathname).equals('/');
+        assume(data.href).equals('file:///');
+      }
+
+      url = 'file:////';
+      data = parse(url);
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('//');
+      assume(data.href).equals(url);
+
+      url = 'file://///';
+      data = parse(url);
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('///');
+      assume(data.href).equals(url);
+
+      url = 'file:///Users/foo/BAR/baz.pdf';
+      data = parse(url);
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('/Users/foo/BAR/baz.pdf');
+      assume(data.href).equals(url);
+
+      url = 'file:///foo/bar?baz=qux#hash';
+      data = parse(url);
+      assume(data.protocol).equals('file:');
+      assume(data.hash).equals('#hash');
+      assume(data.query).equals('?baz=qux');
+      assume(data.pathname).equals('/foo/bar');
+      assume(data.href).equals(url);
+
+      data = parse('file://c:\\foo\\bar\\');
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('/c:/foo/bar/');
+      assume(data.href).equals('file:///c:/foo/bar/');
+
+      data = parse('file://host/file');
+      assume(data.protocol).equals('file:');
+      assume(data.host).equals('host');
+      assume(data.hostname).equals('host');
+      assume(data.pathname).equals('/file');
+      assume(data.href).equals('file://host/file');
+
+      data = parse('foo/bar', 'file:///baz');
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('/foo/bar');
+      assume(data.href).equals('file:///foo/bar');
+
+      data = parse('foo/bar', 'file:///baz/');
+      assume(data.protocol).equals('file:');
+      assume(data.pathname).equals('/baz/foo/bar');
+      assume(data.href).equals('file:///baz/foo/bar');
+    });
   });
 
   describe('ip', function () {
@@ -391,13 +715,14 @@ describe('url-parse', function () {
     });
 
     it('parses ipv6 with auth', function () {
-      var url = 'http://user:password@[3ffe:2a00:100:7031::1]:8080'
+      var url = 'http://user:password@[3ffe:2a00:100:7031::1]:8080/'
         , parsed = parse(url);
 
       assume(parsed.username).equals('user');
       assume(parsed.password).equals('password');
       assume(parsed.host).equals('[3ffe:2a00:100:7031::1]:8080');
       assume(parsed.hostname).equals('[3ffe:2a00:100:7031::1]');
+      assume(parsed.pathname).equals('/');
       assume(parsed.href).equals(url);
     });
 
@@ -446,6 +771,113 @@ describe('url-parse', function () {
       assume(parsed.hostname).equals('www.example.com');
       assume(parsed.href).equals(url);
     });
+
+    it('handles @ in username', function () {
+      var url = 'http://user@@www.example.com/'
+        , parsed = parse(url);
+
+      assume(parsed.protocol).equals('http:');
+      assume(parsed.auth).equals('user%40');
+      assume(parsed.username).equals('user%40');
+      assume(parsed.password).equals('');
+      assume(parsed.hostname).equals('www.example.com');
+      assume(parsed.pathname).equals('/');
+      assume(parsed.href).equals('http://user%40@www.example.com/');
+
+      url = 'http://user%40@www.example.com/';
+      parsed = parse(url);
+
+      assume(parsed.protocol).equals('http:');
+      assume(parsed.auth).equals('user%40');
+      assume(parsed.username).equals('user%40');
+      assume(parsed.password).equals('');
+      assume(parsed.hostname).equals('www.example.com');
+      assume(parsed.pathname).equals('/');
+      assume(parsed.href).equals('http://user%40@www.example.com/');
+    });
+
+    it('handles @ in password', function () {
+      var url = 'http://user@:pas:s@@www.example.com/'
+        , parsed = parse(url);
+
+      assume(parsed.protocol).equals('http:');
+      assume(parsed.auth).equals('user%40:pas%3As%40');
+      assume(parsed.username).equals('user%40');
+      assume(parsed.password).equals('pas%3As%40');
+      assume(parsed.hostname).equals('www.example.com');
+      assume(parsed.pathname).equals('/');
+      assume(parsed.href).equals('http://user%40:pas%3As%40@www.example.com/');
+
+      url = 'http://user%40:pas%3As%40@www.example.com/'
+      parsed = parse(url);
+
+      assume(parsed.protocol).equals('http:');
+      assume(parsed.auth).equals('user%40:pas%3As%40');
+      assume(parsed.username).equals('user%40');
+      assume(parsed.password).equals('pas%3As%40');
+      assume(parsed.hostname).equals('www.example.com');
+      assume(parsed.pathname).equals('/');
+      assume(parsed.href).equals('http://user%40:pas%3As%40@www.example.com/');
+    });
+
+    it('adds @ to href if auth and host are empty', function () {
+      var parsed, i = 0;
+      var urls = [
+        'http:@/127.0.0.1',
+        'http::@/127.0.0.1',
+        'http:/@/127.0.0.1',
+        'http:/:@/127.0.0.1',
+        'http://@/127.0.0.1',
+        'http://:@/127.0.0.1',
+        'http:///@/127.0.0.1',
+        'http:///:@/127.0.0.1'
+      ];
+
+      for (; i < urls.length; i++) {
+        parsed = parse(urls[i]);
+
+        assume(parsed.protocol).equals('http:');
+        assume(parsed.auth).equals('');
+        assume(parsed.username).equals('');
+        assume(parsed.password).equals('');
+        assume(parsed.host).equals('');
+        assume(parsed.hostname).equals('');
+        assume(parsed.pathname).equals('/127.0.0.1');
+        assume(parsed.origin).equals('null');
+        assume(parsed.href).equals('http://@/127.0.0.1');
+        assume(parsed.toString()).equals('http://@/127.0.0.1');
+      }
+
+      urls = [
+        'http:@/',
+        'http:@',
+        'http::@/',
+        'http::@',
+        'http:/@/',
+        'http:/@',
+        'http:/:@/',
+        'http:/:@',
+        'http://@/',
+        'http://@',
+        'http://:@/',
+        'http://:@'
+      ];
+
+      for (i = 0; i < urls.length; i++) {
+        parsed = parse(urls[i]);
+
+        assume(parsed.protocol).equals('http:');
+        assume(parsed.auth).equals('');
+        assume(parsed.username).equals('');
+        assume(parsed.password).equals('');
+        assume(parsed.host).equals('');
+        assume(parsed.hostname).equals('');
+        assume(parsed.pathname).equals('/');
+        assume(parsed.origin).equals('null');
+        assume(parsed.href).equals('http:///');
+        assume(parsed.toString()).equals('http:///');
+      }
+    });
   });
 
   it('accepts multiple ???', function () {
@@ -467,7 +899,7 @@ describe('url-parse', function () {
 
       assume(data.port).equals('');
       assume(data.host).equals('localhost');
-      assume(data.href).equals('http://localhost');
+      assume(data.href).equals('http://localhost/');
     });
 
     it('inherits port numbers for relative urls', function () {
@@ -516,7 +948,8 @@ describe('url-parse', function () {
     });
 
     it('inherits protocol for relative protocols', function () {
-      var data = parse('//foo.com/foo', parse('http://sub.example.com:808/'));
+      var lolcation = parse('http://sub.example.com:808/')
+        , data = parse('//foo.com/foo', lolcation);
 
       assume(data.port).equals('');
       assume(data.host).equals('foo.com');
@@ -529,13 +962,13 @@ describe('url-parse', function () {
 
       assume(data.port).equals('');
       assume(data.host).equals('localhost');
-      assume(data.href).equals('http://localhost');
+      assume(data.href).equals('http://localhost/');
     });
 
     it('resolves pathname for relative urls', function () {
       var data, i = 0;
       var tests = [
-        ['', 'http://foo.com', ''],
+        ['', 'http://foo.com', '/'],
         ['', 'http://foo.com/', '/'],
         ['', 'http://foo.com/a', '/a'],
         ['a', 'http://foo.com', '/a'],
@@ -722,12 +1155,12 @@ describe('url-parse', function () {
       data.set('hash', 'usage');
 
       assume(data.hash).equals('#usage');
-      assume(data.href).equals('http://example.com#usage');
+      assume(data.href).equals('http://example.com/#usage');
 
       data.set('hash', '#license');
 
       assume(data.hash).equals('#license');
-      assume(data.href).equals('http://example.com#license');
+      assume(data.href).equals('http://example.com/#license');
     });
 
     it('updates the port when updating host', function () {
@@ -802,6 +1235,106 @@ describe('url-parse', function () {
       assume(data.href).equals('mailto:alice@atlanta.com');
     });
 
+    it('updates auth when updating username', function() {
+      var data = parse('https://example.com');
+
+      assume(data.set('username', 'foo')).equals(data);
+      assume(data.username).equals('foo');
+      assume(data.auth).equals('foo')
+      assume(data.href).equals('https://foo@example.com/');
+
+      data.set('username', '');
+
+      assume(data.username).equals('');
+      assume(data.auth).equals('')
+      assume(data.href).equals('https://example.com/');
+
+      data.set('username', 'foo:');
+
+      assume(data.username).equals('foo%3A');
+      assume(data.auth).equals('foo%3A')
+      assume(data.href).equals('https://foo%3A@example.com/');
+
+      data = parse('https://foo:bar@example.com')
+      data.set('username', 'baz');
+
+      assume(data.username).equals('baz');
+      assume(data.auth).equals('baz:bar')
+      assume(data.href).equals('https://baz:bar@example.com/');
+    });
+
+    it('updates auth when updating password', function() {
+      var data = parse('https://example.com');
+
+      assume(data.set('password', 'foo')).equals(data);
+      assume(data.password).equals('foo');
+      assume(data.auth).equals(':foo')
+      assume(data.href).equals('https://:foo@example.com/');
+
+      data.set('password', '');
+
+      assume(data.password).equals('');
+      assume(data.auth).equals('')
+      assume(data.href).equals('https://example.com/');
+
+      data.set('password', ':foo@');
+
+      assume(data.password).equals('%3Afoo%40');
+      assume(data.auth).equals(':%3Afoo%40')
+      assume(data.href).equals('https://:%3Afoo%40@example.com/');
+
+      data = parse('https://foo:bar@example.com')
+      data.set('password', 'baz');
+
+      assume(data.password).equals('baz');
+      assume(data.auth).equals('foo:baz')
+      assume(data.href).equals('https://foo:baz@example.com/');
+    });
+
+    it('updates username and password when updating auth', function() {
+      var data = parse('https://example.com');
+
+      assume(data.set('auth', 'foo:bar')).equals(data);
+      assume(data.username).equals('foo');
+      assume(data.password).equals('bar');
+      assume(data.href).equals('https://foo:bar@example.com/');
+
+      assume(data.set('auth', 'baz:')).equals(data);
+      assume(data.username).equals('baz');
+      assume(data.password).equals('');
+      assume(data.href).equals('https://baz@example.com/');
+
+      assume(data.set('auth', 'qux')).equals(data);
+      assume(data.username).equals('qux');
+      assume(data.password).equals('');
+      assume(data.href).equals('https://qux@example.com/');
+
+      assume(data.set('auth', ':quux')).equals(data);
+      assume(data.username).equals('');
+      assume(data.password).equals('quux');
+      assume(data.href).equals('https://:quux@example.com/');
+
+      assume(data.set('auth', 'user@:pass@')).equals(data);
+      assume(data.username).equals('user%40');
+      assume(data.password).equals('pass%40');
+      assume(data.href).equals('https://user%40:pass%40@example.com/');
+
+      assume(data.set('auth', 'user%40:pass%40')).equals(data);
+      assume(data.username).equals('user%40');
+      assume(data.password).equals('pass%40');
+      assume(data.href).equals('https://user%40:pass%40@example.com/');
+
+      assume(data.set('auth', 'user:pass:word')).equals(data);
+      assume(data.username).equals('user');
+      assume(data.password).equals('pass%3Aword');
+      assume(data.href).equals('https://user:pass%3Aword@example.com/');
+
+      assume(data.set('auth', 'user:pass%3Aword')).equals(data);
+      assume(data.username).equals('user');
+      assume(data.password).equals('pass%3Aword');
+      assume(data.href).equals('https://user:pass%3Aword@example.com/');
+    });
+
     it('updates other values', function () {
       var data = parse('http://google.com/?foo=bar');