diff --git a/examples/client/asyncio/fiddle_client.py b/examples/client/asyncio/fiddle_client.py
index b379167..5b43dcc 100644
--- a/examples/client/asyncio/fiddle_client.py
+++ b/examples/client/asyncio/fiddle_client.py
@@ -20,7 +20,7 @@ def hello(a, b, c):
 
 
 async def start_server():
-    await sio.connect('http://localhost:5000')
+    await sio.connect('http://localhost:5000', auth={'token': 'my-token'})
     await sio.wait()
 
 
diff --git a/examples/client/javascript/fiddle_client.js b/examples/client/javascript/fiddle_client.js
index 75e877a..9421b55 100644
--- a/examples/client/javascript/fiddle_client.js
+++ b/examples/client/javascript/fiddle_client.js
@@ -1,7 +1,7 @@
 const io = require('socket.io-client')
 const port = process.env.PORT || 5000;
 
-const socket = io('http://localhost:' + port);
+const socket = io('http://localhost:' + port, {auth: {token: 'my-token'}});
 
 socket.on('connect', () => {
   console.log(`connect ${socket.id}`);
diff --git a/examples/client/javascript/package-lock.json b/examples/client/javascript/package-lock.json
index d2ec500..10053c4 100644
--- a/examples/client/javascript/package-lock.json
+++ b/examples/client/javascript/package-lock.json
@@ -1,167 +1,860 @@
 {
   "name": "socketio-examples",
   "version": "0.1.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
-  "dependencies": {
-    "@types/body-parser": {
+  "packages": {
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+      "version": "0.1.0",
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+        "express": "^4.17.1",
+        "smoothie": "1.19.0",
+        "socket.io": "^3.0.0",
+        "socket.io-client": "^3.0.0"
+      }
+    },
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+      "version": "1.2.10",
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+    "node_modules/@types/cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-y7mImlc/rNkvCRmg8gC3/lj87S7pTUIJ6QGjwHR9WQJcFs+ZMTOaoPrkdFA/YdbuqVEmEbb5RdhVxMkAcgOnpg=="
+    },
+    "node_modules/@types/cors": {
+      "version": "2.8.10",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.10.tgz",
+      "integrity": "sha512-C7srjHiVG3Ey1nR6d511dtDkCEjxuN9W1HWAEjGq8kpcwmNM6JJkpC0xvabM7BXTG2wDq8Eu33iH9aQKa7IvLQ=="
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+    "node_modules/@types/node": {
+      "version": "14.14.37",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.37.tgz",
+      "integrity": "sha512-XYmBiy+ohOR4Lh5jE379fV2IU+6Jn4g5qASinhitfyO71b/sCo6MKsMLF5tc7Zf2CE8hViVQyYSobJNke8OvUw=="
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+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
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-      "resolved": "https://registry.npmjs.org/through2/-/through2-0.4.2.tgz",
-      "integrity": "sha1-2/WGYDEVHsg1K7bE22SiKSqEC5s=",
-      "requires": {
-        "readable-stream": "~1.0.17",
-        "xtend": "~2.1.1"
-      },
-      "dependencies": {
-        "readable-stream": {
-          "version": "1.0.34",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz",
-          "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=",
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.1",
-            "isarray": "0.0.1",
-            "string_decoder": "~0.10.x"
-          }
-        },
-        "string_decoder": {
-          "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
-        },
-        "xtend": {
-          "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/xtend/-/xtend-2.1.2.tgz",
-          "integrity": "sha1-bv7MKk2tjmlixJAbM3znuoe10os=",
-          "requires": {
-            "object-keys": "~0.4.0"
-          }
-        }
-      }
-    },
-    "timers-browserify": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-1.0.3.tgz",
-      "integrity": "sha1-/7pwycEu7ZFv1nMY5imsbzIpVVE=",
-      "requires": {
-        "process": "~0.5.1"
-      },
-      "dependencies": {
-        "process": {
-          "version": "0.5.2",
-          "resolved": "https://registry.npmjs.org/process/-/process-0.5.2.tgz",
-          "integrity": "sha1-FjjYqONML0QKkduVq5rrZ3/Bhc8="
-        }
-      }
-    },
     "toidentifier": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
       "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
     },
-    "tty-browserify": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.1.tgz",
-      "integrity": "sha512-C3TaO7K81YvjCgQH9Q1S3R3P3BtN3RIM8n+OvX4il1K1zgE8ZhI0op7kClgkxtutIE8hQrcrHBXvIheqKUUCxw=="
-    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -1521,95 +1411,11 @@
         "mime-types": "~2.1.24"
       }
     },
-    "typedarray": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
-    },
-    "uglify-js": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.5.0.tgz",
-      "integrity": "sha1-SrXWWkcw7Lek+2LT9JniBU2Y+6E=",
-      "requires": {
-        "async": "~0.2.6",
-        "source-map": "~0.5.1",
-        "uglify-to-browserify": "~1.0.0",
-        "yargs": "~3.5.4"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
-        }
-      }
-    },
-    "uglify-to-browserify": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
-      "integrity": "sha1-bgkk1r2mta/jSeOabWMoUKD4grc="
-    },
-    "umd": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/umd/-/umd-2.1.0.tgz",
-      "integrity": "sha1-SmMHt2LxfwLSAbX6FU5nM5bCY88=",
-      "requires": {
-        "rfile": "~1.0.0",
-        "ruglify": "~1.0.0",
-        "through": "~2.3.4",
-        "uglify-js": "~2.4.0"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.1.34",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.34.tgz",
-          "integrity": "sha1-p8/omux7FoLDsZjQrPtH19CQVms=",
-          "requires": {
-            "amdefine": ">=0.0.4"
-          }
-        },
-        "uglify-js": {
-          "version": "2.4.24",
-          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.4.24.tgz",
-          "integrity": "sha1-+tV1XB4Vd2WLsG/5q25UjJW+vW4=",
-          "requires": {
-            "async": "~0.2.6",
-            "source-map": "0.1.34",
-            "uglify-to-browserify": "~1.0.0",
-            "yargs": "~3.5.4"
-          }
-        }
-      }
-    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
     },
-    "url": {
-      "version": "0.10.3",
-      "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
-      "integrity": "sha1-Ah5NnHcF8hu/N9A861h2dAJ3TGQ=",
-      "requires": {
-        "punycode": "1.3.2",
-        "querystring": "0.2.0"
-      },
-      "dependencies": {
-        "punycode": {
-          "version": "1.3.2",
-          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
-          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
-        }
-      }
-    },
-    "util": {
-      "version": "0.10.4",
-      "resolved": "https://registry.npmjs.org/util/-/util-0.10.4.tgz",
-      "integrity": "sha512-0Pm9hTQ3se5ll1XihRic3FDIku70C+iHUdT/W926rSgHV5QgXsYbKZN8MSC3tJtSkhuROzvsQjAaFENRXr+19A==",
-      "requires": {
-        "inherits": "2.0.3"
-      }
-    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -1620,57 +1426,17 @@
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
       "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
     },
-    "vm-browserify": {
-      "version": "0.0.4",
-      "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
-      "integrity": "sha1-XX6kW7755Kb/ZflUOOCofDV9WnM=",
-      "requires": {
-        "indexof": "0.0.1"
-      }
-    },
-    "window-size": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
-      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0="
-    },
-    "wordwrap": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc="
-    },
     "ws": {
-      "version": "7.4.0",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.0.tgz",
-      "integrity": "sha512-kyFwXuV/5ymf+IXhS6f0+eAFvydbaBW3zjpT6hUdAh/hbVjTIB5EHBGi0bPoCLSK2wcuz3BrEkB9LrYv1Nm4NQ=="
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.4.tgz",
+      "integrity": "sha512-Qm8k8ojNQIMx7S+Zp8u/uHOx7Qazv3Yv4q68MiWWWOJhiwG5W3x7iqmRtJo8xxrciZUY4vRxUTJCKuRnF28ZZw==",
+      "requires": {}
     },
     "xmlhttprequest-ssl": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
       "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4="
     },
-    "xtend": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-3.0.0.tgz",
-      "integrity": "sha1-XM50B7r2Qsunvs2laBEcST9ZZlo="
-    },
-    "yargs": {
-      "version": "3.5.4",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.5.4.tgz",
-      "integrity": "sha1-2K/49mXpTDS9JZvevRv68N3TU2E=",
-      "requires": {
-        "camelcase": "^1.0.2",
-        "decamelize": "^1.0.0",
-        "window-size": "0.1.0",
-        "wordwrap": "0.0.2"
-      },
-      "dependencies": {
-        "wordwrap": {
-          "version": "0.0.2",
-          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
-          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8="
-        }
-      }
-    },
     "yeast": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
diff --git a/examples/client/javascript/package.json b/examples/client/javascript/package.json
index f2bba31..bd844b5 100644
--- a/examples/client/javascript/package.json
+++ b/examples/client/javascript/package.json
@@ -4,7 +4,7 @@
   "dependencies": {
     "express": "^4.17.1",
     "smoothie": "1.19.0",
-    "socket.io": "^3.0.0",
-    "socket.io-client": "^3.0.0"
+    "socket.io": "^3.0.3",
+    "socket.io-client": "^3.0.3"
   }
 }
diff --git a/examples/client/threads/fiddle_client.py b/examples/client/threads/fiddle_client.py
index 176d083..50f5e2a 100644
--- a/examples/client/threads/fiddle_client.py
+++ b/examples/client/threads/fiddle_client.py
@@ -19,5 +19,5 @@ def hello(a, b, c):
 
 
 if __name__ == '__main__':
-    sio.connect('http://localhost:5000')
+    sio.connect('http://localhost:5000', auth={'token': 'my-token'})
     sio.wait()
diff --git a/examples/server/aiohttp/fiddle.py b/examples/server/aiohttp/fiddle.py
index 95b75c2..dfde8e1 100644
--- a/examples/server/aiohttp/fiddle.py
+++ b/examples/server/aiohttp/fiddle.py
@@ -13,8 +13,8 @@ async def index(request):
 
 
 @sio.event
-async def connect(sid, environ):
-    print('connected', sid)
+async def connect(sid, environ, auth):
+    print(f'connected auth={auth} sid={sid}')
     await sio.emit('hello', (1, 2, {'hello': 'you'}), to=sid)
 
 
diff --git a/examples/server/asgi/fiddle.py b/examples/server/asgi/fiddle.py
index bd9a4c1..6899ed1 100644
--- a/examples/server/asgi/fiddle.py
+++ b/examples/server/asgi/fiddle.py
@@ -11,8 +11,8 @@ app = socketio.ASGIApp(sio, static_files={
 
 
 @sio.event
-async def connect(sid, environ):
-    print('connected', sid)
+async def connect(sid, environ, auth):
+    print(f'connected auth={auth} sid={sid}')
     await sio.emit('hello', (1, 2, {'hello': 'you'}), to=sid)
 
 
diff --git a/examples/server/javascript/fiddle.js b/examples/server/javascript/fiddle.js
index a7ea2f1..cdcd37a 100644
--- a/examples/server/javascript/fiddle.js
+++ b/examples/server/javascript/fiddle.js
@@ -7,7 +7,7 @@ const port = process.env.PORT || 5000;
 app.use(express.static(__dirname + '/fiddle_public'));
 
 io.on('connection', socket => {
-  console.log(`connect ${socket.id}`);
+  console.log(`connect auth=${JSON.stringify(socket.handshake.auth)} sid=${socket.id}`);
 
   socket.emit('hello', 1, '2', {
     hello: 'you'
diff --git a/examples/server/javascript/package-lock.json b/examples/server/javascript/package-lock.json
index d2ec500..bbf41c3 100644
--- a/examples/server/javascript/package-lock.json
+++ b/examples/server/javascript/package-lock.json
@@ -1,167 +1,860 @@
 {
   "name": "socketio-examples",
   "version": "0.1.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
-  "dependencies": {
-    "@types/body-parser": {
+  "packages": {
+    "": {
+      "name": "socketio-examples",
+      "version": "0.1.0",
+      "dependencies": {
+        "express": "^4.17.1",
+        "smoothie": "1.19.0",
+        "socket.io": "^3.0.3",
+        "socket.io-client": "^3.0.3"
+      }
+    },
+    "node_modules/@types/component-emitter": {
+      "version": "1.2.10",
+      "resolved": "https://registry.npmjs.org/@types/component-emitter/-/component-emitter-1.2.10.tgz",
+      "integrity": "sha512-bsjleuRKWmGqajMerkzox19aGbscQX5rmmvvXl3wlIp5gMG1HgkiwPxsN5p070fBDKTNSPgojVbuY1+HWMbFhg=="
+    },
+    "node_modules/@types/cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-y7mImlc/rNkvCRmg8gC3/lj87S7pTUIJ6QGjwHR9WQJcFs+ZMTOaoPrkdFA/YdbuqVEmEbb5RdhVxMkAcgOnpg=="
+    },
+    "node_modules/@types/cors": {
+      "version": "2.8.10",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.10.tgz",
+      "integrity": "sha512-C7srjHiVG3Ey1nR6d511dtDkCEjxuN9W1HWAEjGq8kpcwmNM6JJkpC0xvabM7BXTG2wDq8Eu33iH9aQKa7IvLQ=="
+    },
+    "node_modules/@types/node": {
+      "version": "14.14.37",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.37.tgz",
+      "integrity": "sha512-XYmBiy+ohOR4Lh5jE379fV2IU+6Jn4g5qASinhitfyO71b/sCo6MKsMLF5tc7Zf2CE8hViVQyYSobJNke8OvUw=="
+    },
+    "node_modules/accepts": {
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
+      "dependencies": {
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
+    },
+    "node_modules/backo2": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/backo2/-/backo2-1.0.2.tgz",
+      "integrity": "sha1-MasayLEpNjRj41s+u2n038+6eUc="
+    },
+    "node_modules/base64-arraybuffer": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/base64-arraybuffer/-/base64-arraybuffer-0.1.4.tgz",
+      "integrity": "sha1-mBjHngWbE1X5fgQooBfIOOkLqBI=",
+      "engines": {
+        "node": ">= 0.6.0"
+      }
+    },
+    "node_modules/base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
+      "integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog==",
+      "engines": {
+        "node": "^4.5.0 || >= 5.9"
+      }
+    },
+    "node_modules/body-parser": {
       "version": "1.19.0",
-      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.0.tgz",
-      "integrity": "sha512-W98JrE0j2K78swW4ukqMleo8R7h/pFETjM2DQ90MF6XK2i4LO4W3gQ71Lt4w3bfm2EvVSyWHplECvB5sK22yFQ==",
-      "requires": {
-        "@types/connect": "*",
-        "@types/node": "*"
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
+      "dependencies": {
+        "bytes": "3.1.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "on-finished": "~2.3.0",
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/bytes": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/component-emitter": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
+      "integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
+    },
+    "node_modules/content-disposition": {
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "dependencies": {
+        "safe-buffer": "5.1.2"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/content-type": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
+      "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cookie-signature": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
+      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    },
+    "node_modules/cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "dependencies": {
+        "object-assign": "^4",
+        "vary": "^1"
+      },
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
+    "node_modules/debug": {
+      "version": "2.6.9",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "dependencies": {
+        "ms": "2.0.0"
+      }
+    },
+    "node_modules/depd": {
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-    },
     "yeast": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
diff --git a/examples/server/javascript/package.json b/examples/server/javascript/package.json
index c1e2c3b..bd844b5 100644
--- a/examples/server/javascript/package.json
+++ b/examples/server/javascript/package.json
@@ -2,9 +2,9 @@
   "name": "socketio-examples",
   "version": "0.1.0",
   "dependencies": {
-    "socket.io": "^3.0.0",
-    "socket.io-client": "^3.0.0",
     "express": "^4.17.1",
-    "smoothie": "1.19.0"
+    "smoothie": "1.19.0",
+    "socket.io": "^3.0.3",
+    "socket.io-client": "^3.0.3"
   }
 }
diff --git a/examples/server/sanic/fiddle.py b/examples/server/sanic/fiddle.py
index a0f33cb..8fe4db8 100644
--- a/examples/server/sanic/fiddle.py
+++ b/examples/server/sanic/fiddle.py
@@ -15,8 +15,8 @@ def index(request):
 
 
 @sio.event
-async def connect(sid, environ):
-    print('connected', sid)
+async def connect(sid, environ, auth):
+    print(f'connected auth={auth} sid={sid}')
     await sio.emit('hello', (1, 2, {'hello': 'you'}), to=sid)
 
 
diff --git a/examples/server/tornado/fiddle.py b/examples/server/tornado/fiddle.py
index 66a6df9..1e7e927 100644
--- a/examples/server/tornado/fiddle.py
+++ b/examples/server/tornado/fiddle.py
@@ -18,8 +18,8 @@ class MainHandler(tornado.web.RequestHandler):
 
 
 @sio.event
-async def connect(sid, environ):
-    print('connected', sid)
+async def connect(sid, environ, auth):
+    print(f'connected auth={auth} sid={sid}')
     await sio.emit('hello', (1, 2, {'hello': 'you'}), to=sid)
 
 
diff --git a/examples/server/wsgi/fiddle.py b/examples/server/wsgi/fiddle.py
index a07f624..247751b 100644
--- a/examples/server/wsgi/fiddle.py
+++ b/examples/server/wsgi/fiddle.py
@@ -17,8 +17,8 @@ def index():
 
 
 @sio.event
-def connect(sid, environ):
-    print('connected', sid)
+def connect(sid, environ, auth):
+    print(f'connected auth={auth} sid={sid}')
     sio.emit('hello', (1, 2, {'hello': 'you'}), to=sid)
 
 
diff --git a/socketio/asyncio_client.py b/socketio/asyncio_client.py
index d89c627..1bf23ca 100644
--- a/socketio/asyncio_client.py
+++ b/socketio/asyncio_client.py
@@ -62,7 +62,7 @@ class AsyncClient(client.Client):
     def is_asyncio_based(self):
         return True
 
-    async def connect(self, url, headers={}, transports=None,
+    async def connect(self, url, headers={}, auth=None, transports=None,
                       namespaces=None, socketio_path='socket.io', wait=True,
                       wait_timeout=1):
         """Connect to a Socket.IO server.
@@ -71,6 +71,9 @@ class AsyncClient(client.Client):
                     query string parameters if required by the server.
         :param headers: A dictionary with custom headers to send with the
                         connection request.
+        :param auth: Authentication data passed to the server with the
+                     connection request, normally a dictionary with one or
+                     more string key/value pairs.
         :param transports: The list of allowed transports. Valid transports
                            are ``'polling'`` and ``'websocket'``. If not
                            given, the polling transport is connected first,
@@ -103,6 +106,7 @@ class AsyncClient(client.Client):
 
         self.connection_url = url
         self.connection_headers = headers
+        self.connection_auth = auth
         self.connection_transports = transports
         self.connection_namespaces = namespaces
         self.socketio_path = socketio_path
@@ -437,6 +441,7 @@ class AsyncClient(client.Client):
             try:
                 await self.connect(self.connection_url,
                                    headers=self.connection_headers,
+                                   auth=self.connection_auth,
                                    transports=self.connection_transports,
                                    namespaces=self.connection_namespaces,
                                    socketio_path=self.socketio_path)
@@ -458,7 +463,8 @@ class AsyncClient(client.Client):
         self.logger.info('Engine.IO connection established')
         self.sid = self.eio.sid
         for n in self.connection_namespaces:
-            await self._send_packet(packet.Packet(packet.CONNECT, namespace=n))
+            await self._send_packet(packet.Packet(
+                packet.CONNECT, data=self.connection_auth, namespace=n))
 
     async def _handle_eio_message(self, data):
         """Dispatch Engine.IO messages."""
diff --git a/socketio/client.py b/socketio/client.py
index 80c2e31..e5599eb 100644
--- a/socketio/client.py
+++ b/socketio/client.py
@@ -120,6 +120,7 @@ class Client(object):
 
         self.connection_url = None
         self.connection_headers = None
+        self.connection_auth = None
         self.connection_transports = None
         self.connection_namespaces = []
         self.socketio_path = None
@@ -233,7 +234,7 @@ class Client(object):
         self.namespace_handlers[namespace_handler.namespace] = \
             namespace_handler
 
-    def connect(self, url, headers={}, transports=None,
+    def connect(self, url, headers={}, auth=None, transports=None,
                 namespaces=None, socketio_path='socket.io', wait=True,
                 wait_timeout=1):
         """Connect to a Socket.IO server.
@@ -242,6 +243,9 @@ class Client(object):
                     query string parameters if required by the server.
         :param headers: A dictionary with custom headers to send with the
                         connection request.
+        :param auth: Authentication data passed to the server with the
+                     connection request, normally a dictionary with one or
+                     more string key/value pairs.
         :param transports: The list of allowed transports. Valid transports
                            are ``'polling'`` and ``'websocket'``. If not
                            given, the polling transport is connected first,
@@ -272,6 +276,7 @@ class Client(object):
 
         self.connection_url = url
         self.connection_headers = headers
+        self.connection_auth = auth
         self.connection_transports = transports
         self.connection_namespaces = namespaces
         self.socketio_path = socketio_path
@@ -602,6 +607,7 @@ class Client(object):
             try:
                 self.connect(self.connection_url,
                              headers=self.connection_headers,
+                             auth=self.connection_auth,
                              transports=self.connection_transports,
                              namespaces=self.connection_namespaces,
                              socketio_path=self.socketio_path)
@@ -623,7 +629,8 @@ class Client(object):
         self.logger.info('Engine.IO connection established')
         self.sid = self.eio.sid
         for n in self.connection_namespaces:
-            self._send_packet(packet.Packet(packet.CONNECT, namespace=n))
+            self._send_packet(packet.Packet(
+                packet.CONNECT, data=self.connection_auth, namespace=n))
 
     def _handle_eio_message(self, data):
         """Dispatch Engine.IO messages."""
diff --git a/tests/asyncio/test_asyncio_client.py b/tests/asyncio/test_asyncio_client.py
index 38193fd..1a1d7d6 100644
--- a/tests/asyncio/test_asyncio_client.py
+++ b/tests/asyncio/test_asyncio_client.py
@@ -55,6 +55,7 @@ class TestAsyncClient(unittest.TestCase):
             c.connect(
                 'url',
                 headers='headers',
+                auth='auth',
                 transports='transports',
                 namespaces=['/foo', '/', '/bar'],
                 socketio_path='path',
@@ -63,6 +64,7 @@ class TestAsyncClient(unittest.TestCase):
         )
         assert c.connection_url == 'url'
         assert c.connection_headers == 'headers'
+        assert c.connection_auth == 'auth'
         assert c.connection_transports == 'transports'
         assert c.connection_namespaces == ['/foo', '/', '/bar']
         assert c.socketio_path == 'path'
@@ -934,21 +936,24 @@ class TestAsyncClient(unittest.TestCase):
         ]
         assert c._reconnect_task == 'foo'
 
-    def test_eio_connect(self):
+    def test_handle_eio_connect(self):
         c = asyncio_client.AsyncClient()
         c.connection_namespaces = ['/', '/foo']
+        c.connection_auth = 'auth'
         c._send_packet = AsyncMock()
         c.eio.sid = 'foo'
         assert c.sid is None
         _run(c._handle_eio_connect())
         assert c.sid == 'foo'
         assert c._send_packet.mock.call_count == 2
-        expected_packet = packet.Packet(packet.CONNECT, namespace='/')
+        expected_packet = packet.Packet(
+            packet.CONNECT, data='auth', namespace='/')
         assert (
             c._send_packet.mock.call_args_list[0][0][0].encode()
             == expected_packet.encode()
         )
-        expected_packet = packet.Packet(packet.CONNECT, namespace='/foo')
+        expected_packet = packet.Packet(
+            packet.CONNECT, data='auth', namespace='/foo')
         assert (
             c._send_packet.mock.call_args_list[1][0][0].encode()
             == expected_packet.encode()
diff --git a/tests/common/test_client.py b/tests/common/test_client.py
index 61da8d9..e04f0cc 100644
--- a/tests/common/test_client.py
+++ b/tests/common/test_client.py
@@ -154,6 +154,7 @@ class TestClient(unittest.TestCase):
         c.connect(
             'url',
             headers='headers',
+            auth='auth',
             transports='transports',
             namespaces=['/foo', '/', '/bar'],
             socketio_path='path',
@@ -161,6 +162,7 @@ class TestClient(unittest.TestCase):
         )
         assert c.connection_url == 'url'
         assert c.connection_headers == 'headers'
+        assert c.connection_auth == 'auth'
         assert c.connection_transports == 'transports'
         assert c.connection_namespaces == ['/foo', '/', '/bar']
         assert c.socketio_path == 'path'
@@ -1008,18 +1010,21 @@ class TestClient(unittest.TestCase):
     def test_handle_eio_connect(self):
         c = client.Client()
         c.connection_namespaces = ['/', '/foo']
+        c.connection_auth = 'auth'
         c._send_packet = mock.MagicMock()
         c.eio.sid = 'foo'
         assert c.sid is None
         c._handle_eio_connect()
         assert c.sid == 'foo'
         assert c._send_packet.call_count == 2
-        expected_packet = packet.Packet(packet.CONNECT, namespace='/')
+        expected_packet = packet.Packet(
+            packet.CONNECT, data='auth', namespace='/')
         assert (
             c._send_packet.call_args_list[0][0][0].encode()
             == expected_packet.encode()
         )
-        expected_packet = packet.Packet(packet.CONNECT, namespace='/foo')
+        expected_packet = packet.Packet(
+            packet.CONNECT, data='auth', namespace='/foo')
         assert (
             c._send_packet.call_args_list[1][0][0].encode()
             == expected_packet.encode()