1. Building Servers
with Node.js
Travis Swicegood
#nodetalk
Licensed under Creative Commons,
Attribution, Share-Alike

2. Hi, I’m Travis
building servers with node.js some rights reserved

3. #nodetalk
building servers with node.js some rights reserved

4. What’s this
talk about?
building servers with node.js some rights reserved

5. What is
Node.js?
building servers with node.js some rights reserved

6. Servers
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7. GTD
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8. Is it Right
For Me?
building servers with node.js some rights reserved

9. What is
Node.js?
building servers with node.js some rights reserved

10. Evented I/O
Networking
Toolkit
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11. What’s “evented?”
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12. Some Code
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13. Standard Data Store
var db = new Database({host: "localhost"});
db.connect();
var result = db.find({name: "a-post"});
// do something with result
building servers with node.js some rights reserved

14. Evented Data Store
var db = new Database({host: "localhost"});
db.connect(function(conn) {
conn.find({name: "a-post"}, function(result) {
// do something with result
});
});
building servers with node.js some rights reserved

15. Event Loop
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16. An Analogy
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17. A rabbi, a priest,
and a cowboy walk
into a bar.
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18. Take 1
Simple Bartender
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19. Rabbi
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20. Priest
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21. Cowboy…
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22. … he starts
to talk
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23. Bartender is
now blocked
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24. Take 2
Evented Bartender
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25. Rabbi
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26. Priest
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27. Cowboy…
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28. … he starts
to talk
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29. Bartender starts
filling orders
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30. Fixing Take 1
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31. Add more
bartenders
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32. Limit time
with each client
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33. Respond to
Events
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34. Who uses this?
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35. Nginx
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36. Memcached
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37. Most NoSQL
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38. Servers
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39. Basic Socket Server
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40. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

41. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

42. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

43. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

44. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

45. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

46. Echo Server
var net = require("net");
net.createServer(function(socket) {
socket.on("data", function(data) {
socket.write("You said: " + data);
socket.end();
});
socket.write("Please say something:n");
}).listen(1234);
console.log("Listening on 1234");
building servers with node.js some rights reserved

47. Storing State
building servers with node.js some rights reserved

48. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

49. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

50. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

51. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

52. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

53. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

54. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

55. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

56. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

57. Personalized Echo Server
net.createServer(function(socket) {
var name = false;
socket.on("data", function(data) {
if (!name) {
name = data.toString('utf8').trim();
socket.write("Thanks, " + name + "n");
socket.write("Please say something:n");
} else {
socket.write(name + ", you said: " + data);
socket.end();
}
});
socket.write("Please tell me your name: ");
}).listen(1234);
building servers with node.js some rights reserved

58. Web Servers
building servers with node.js some rights reserved

59. Hello World
building servers with node.js some rights reserved

60. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

61. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

62. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

63. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

64. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

65. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

66. Something’s
Different
building servers with node.js some rights reserved

67. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

68. Hello World
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

69. Any idea why?
building servers with node.js some rights reserved

70. Hello World
var http = require("http");
http.createServer(function(request, response) {
setTimeout(function() {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>Hello, World!</h1>");
response.end();
}, 1000);
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

71. Hello World
var http = require("http");
http.createServer(function(request, response) {
db.find({"slug": "a-blog-post"}, function(post) {
response.writeHead(200, {"Content-Type": "text/html"});
response.write("<h1>" + post.title + "</h1>");
response.write(post.body);
response.end();
});
}).listen(4321);
console.log("Now listening on port 4321");
building servers with node.js some rights reserved

72. Grokking
the Request
building servers with node.js some rights reserved

73. Output the Request
building servers with node.js some rights reserved

74. Output the Request
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.write(require("util").inspect(request));
response.end();
}).listen(4321);
console.log("Listening on 4321");
building servers with node.js some rights reserved

75. Output the Request
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
response.write(require("util").inspect(request));
response.end();
}).listen(4321);
console.log("Listening on 4321");
building servers with node.js some rights reserved

76. Output the Request
$ curl -s http://localhost:4321/
{ socket:
{ bufferSize: 0,
fd: 7,
type: 'tcp4',
allowHalfOpen: true,
_readWatcher:
{ socket: [Circular],
callback: [Function: onReadable] },
readable: true,
_writeQueue: [],
_writeQueueEncoding: [],
_writeQueueFD: [],
… and so on, and so on …
building servers with node.js some rights reserved

77. Output the Request
$ curl -s http://localhost:4321/
… way down around line 148 …
url: '/',
method: 'GET',
building servers with node.js some rights reserved

78. Output the Request
$ curl -s http://localhost:4321/say?msg=Hello | grep "url:"
url: '/say?msg=Hello',
building servers with node.js some rights reserved

79. Parsing the URL
building servers with node.js some rights reserved

80. Parsing the URL
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
var parsedUrl = require("url").parse(request.url);
response.write(require("util").inspect(parsedUrl));
response.end();
}).listen(4321);
console.log("Listening on 4321");
building servers with node.js some rights reserved

81. Parsing the URL
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

82. Parsing the URL
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

83. Parsing the URL
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

84. Parsing the URL
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

85. Parsing the URL
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

86. Parsing the Query
building servers with node.js some rights reserved

87. Parsing the Query
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: 'msg=Hello',
pathname: '/say' }
building servers with node.js some rights reserved

88. Parsing the Query
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
var parsedUrl = require("url").parse(request.url, true);
response.write(require("util").inspect(parsedUrl));
response.end();
}).listen(4321);
console.log("Listening on 4321");
building servers with node.js some rights reserved

89. Parsing the Query
var http = require("http");
http.createServer(function(request, response) {
response.writeHead(200, {"Content-Type": "text/plain"});
var parsedUrl = require("url").parse(request.url, true);
response.write(require("util").inspect(parsedUrl));
response.end();
}).listen(4321);
console.log("Listening on 4321");
building servers with node.js some rights reserved

90. Parsing the Query
$ curl -s http://localhost:4321/say?msg=Hello
{ href: '/say?msg=Hello',
search: '?msg=Hello',
query: { msg: 'Hello' },
pathname: '/say' }
building servers with node.js some rights reserved

91. Receiving Data
building servers with node.js some rights reserved

92. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

93. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

94. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

95. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

96. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

97. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

98. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

99. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

100. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

101. Receiving Data
function(request, response) {
var raw = "";
request.on("data", function(chunk) {
raw += chunk;
});
request.on("end", function() {
var data = JSON.parse(raw),
obj = {message: data.message.split("").reverse().join("")};
response.writeHead(200, {"Content-Type": "application/json"});
response.write(JSON.stringify(obj));
response.end();
});
}
building servers with node.js some rights reserved

102. Something
is Wrong
building servers with node.js some rights reserved

103. Can’t handle Errors
$ node json-reverse.js
Listening on 4321
undefined:0
^
SyntaxError: Unexpected end of input
at Object.parse (native)
at IncomingMessage.<anonymous> (/Book/code/servers/json-
reverse.js:8:21)
at IncomingMessage.emit (events.js:39:17)
at HTTPParser.onMessageComplete (http.js:111:23)
at Socket.ondata (http.js:945:22)
at Socket._onReadable (net.js:654:27)
at IOWatcher.onReadable [as callback] (net.js:156:10)
building servers with node.js some rights reserved

104. Fault-Tolerance
building servers with node.js some rights reserved

105. Quick Refactor
var handleResponse = function(response, code, message) {
response.writeHead(code, {"Content-Type": "application/json"});
response.write(message);
response.end();
};
building servers with node.js some rights reserved

106. Fault Tolerant Reverse
request.on("end", function() {
if (!raw) {
handleResponse(response, 400, "Requires more data");
return;
}
try {
var data = JSON.parse(raw);
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
return;
}
var obj = {message: data.message.split("").reverse().join("") };
handleResponse(response, 200, JSON.stringify(obj))
});
building servers with node.js some rights reserved

107. Fault Tolerant Reverse
request.on("end", function() {
if (!raw) {
handleResponse(response, 400, "Requires more data");
return;
}
try {
var data = JSON.parse(raw);
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
building servers with node.js some rights reserved

108. Fault Tolerant Reverse
request.on("end", function() {
if (!raw) {
handleResponse(response, 400, "Requires more data");
return;
}
try {
var data = JSON.parse(raw);
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
building servers with node.js some rights reserved

109. Fault Tolerant Reverse
// earlier code
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
return;
}
var obj = {message: data.message.split("").reverse().join("") };
handleResponse(response, 200, JSON.stringify(obj))
});
building servers with node.js some rights reserved

110. Fault Tolerant Reverse
// earlier code
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
return;
}
var obj = {message: data.message.split("").reverse().join("") };
handleResponse(response, 200, JSON.stringify(obj))
});
building servers with node.js some rights reserved

111. GTD
building servers with node.js some rights reserved

112. Libraries Help
building servers with node.js some rights reserved

113. Express
visionmedia/express
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114. Hello World
var app = express.createServer();
app.get('/', function(req, res){
res.send('Hello World');
});
app.listen(3000);
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115. Socket.IO
http://socket.io/
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116. Push from the Server
var http = require('http'),
io = require('socket.io');
var server = http.createServer(function(req, res){
// your normal server code
res.writeHead(200, {'Content-Type': 'text/html'});
res.end('<h1>Hello world</h1>');
});
server.listen(80);
// socket.io
var socket = io.listen(server);
socket.on('connection', function(client){
// new client is here!
client.on('message', function(){ … })
client.on('disconnect', function(){ … })
});
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117. Socket.IO
// socket.io
var socket = io.listen(server);
socket.on('connection', function(client){
// new client is here!
client.on('message', function(){ … })
client.on('disconnect', function(){ … })
});
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118. Sending to Client
// socket.io
var socket = io.listen(server);
socket.on('connection', function(client) {
// send a message back to the client
client.send({msg: "Thanks for connecting…"});
// broadcast a message to everyone
client.broadcast({msg: "Another one connected!"});
});
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119. CoffeeScript
jashkenas/coffee-script
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120. Remember this code?
request.on("end", function() {
if (!raw) {
handleResponse(response, 400, "Requires more data");
return;
}
try {
var data = JSON.parse(raw);
} catch(e) {
handleResponse(response, 400, "Invalid JSON");
return;
}
if (!data.message) {
handleResponse(response, 400, "Requires a message");
return;
}
var obj = {message: data.message.split("").reverse().join("") };
handleResponse(response, 200, JSON.stringify(obj))
});
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121. In CoffeeScript
request.on "end", () ->
return handleResponse response, 400, "Requires more data" unless raw
try
data = JSON.parse raw
catch e
return handleResponse response, 400, "Requires more data"
return handleResponse response, 400, "Requires a message" unless data.message
obj =
message: data.message.split("").reverse().join("")
handleResponse response, 200, JSON.stringify obj
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122. Vows
cloudhead/vows
http://vowjs.org/
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123. No Samples
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124. Is it Right
For Me?
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125. It Depends
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126. The Checklist
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127. Control
the Stack
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128. Comfortable
with Change
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129. Full Control Over
App Logic
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130. Lots of Small
Independent
Pieces
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131. Then Maybe
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132. Where to?
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133. nodejs.org
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134. #Node.js
(freenode)
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135. Travis Swicegood
travisswicegood.com
@tswicegood
travis@domain51.com
http://joind.in/2810
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