An extensible, asynchronous HTTP reverse proxy and origin server.
Setup the server:
var argo = require('argo');
argo()
.use(function(handle) {
handle('response', function(env, next) {
env.response.setHeader('Access-Control-Allow-Origin', '*');
next(env);
});
})
.target('http://weather.yahooapis.com')
.listen(1337);Make a request:
$ curl -i http://localhost:1337/forecastrss?w=2467861
HTTP/1.1 200 OK
Date: Thu, 28 Feb 2013 20:55:03 GMT
Content-Type: text/xml;charset=UTF-8
Connection: keep-alive
Server: YTS/1.20.13
Access-Control-Allow-Origin: *
Content-Length: 2337
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<GiantXMLResponse/>Setup the server:
var argo = require('argo');
argo()
.get('^/dogs$', function(handle) {
handle('request', function(env, next) {
env.response.statusCode = 200;
env.response.body = { dogs: ['Alfred', 'Rover', 'Dino'] };
next(env);
});
})
.listen(1337);Make a request:
$ curl -i http://localhost:1337/dogs
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 34
Date: Thu, 28 Feb 2013 20:44:46 GMT
Connection: keep-alive
{"dogs":["Alfred","Rover","Dino"]}$ npm install argo- handleFunction
- use(handleFunction)
- use(package)
- target
- route
- Method filters
- map
- include
- listen
- Error Handling
-
type:'request'or'response' -
options: Mostly used for internal purposes. Optional. -
callback(env, next): A request or response callback.envis an environment context that is passed to every handler, andnextis a reference to the next function in the pipeline.
When the handler is complete and wishes to pass to the next function in the pipeline, it must call next(env).
handleFunction is used to set up request and response handlers.
argo()
//For every request add 'X-Custom-Header' with value 'Yippee!'
.use(function(handle) {
handle('request', function(env, next) {
env.request.headers['X-Custom-Header'] = 'Yippee!';
next(env);
});
})Alias for include(package).
target is used for proxying requests to a backend server.
uri: a string pointing to the target URI.
Example:
argo()
.target('http://weather.yahooapis.com')-
path: a regular expression used to match HTTP Request URI path. -
options: an object with amethodsproperty to filter HTTP methods (e.g.,{ methods: ['GET','POST'] }). Optional. -
handleFunction: Same as inuse.
Example:
argo()
.route('^/greeting$', function(handle) {
handle('request', function(env, next) {
env.response.statusCode = 200;
env.response.headers = { 'Content-Type': 'text/plain' };
env.response.body = 'Hello World!';
next(env);
});
})Method filters built on top of route. del and msearch correspond to
the DELETE and M-SEARCH methods, respectively.
Example:
argo()
.get('^/puppies$', function(handle) {
handle('request', function(env, next) {
env.response.body = JSON.stringify([{name: 'Sparky', breed: 'Fox Terrier' }]);
next(env);
});
})map is used to delegate control to sub-Argo instances based on a request URI path.
-
path: a regular expression used to match the HTTP Request URI path. -
options: an object with amethodsproperty to filter HTTP methods (e.g.,{ methods: ['GET','POST'] }). Optional. -
argoSegmentFunction: a function that is passed an instance ofargofor additional setup.
Example:
argo()
.map('^/payments', function(server) {
server
.use(oauth)
.target('http://backend_payment_server');
})package: An object that contains apackageproperty.
The package property is a function that takes an argo instance as a paramter and returns an object that contains a name and an install function.
Example:
var superPackage = function(argo) {
return {
name: 'Super Package',
install: function() {
argo
.use(oauth)
.route('^/super$', require('./super'));
}
};
};
argo()
.include({ package: superPackage})port: A port on which the server should listen.
Argo allows a special error handler for capturing state when an uncaught exception occurs.
argo()
.use(function(handle) {
handle('error', function(env, error, next) {
console.log(error.message);
env.response.statusCode = 500;
env.response.body = 'Internal Server Error';
next(env);
process.exit();
});
})
.get('^/$', function(handle) {
handle('request', function(env, next) {
env.response.body = 'Hello World!';
next(env);
});
})
.get('^/explode$', function(handle) {
handle('request', function(env, next) {
setImmediate(function() { throw new Error('Ahoy!'); });
});
})
.listen(3000);Unlike other named pipelines, there should be only one error handler assigned to an Argo server. It is recommended to exit the process once an error has been handled. This feature uses domains.
See cluster.js for an example of using error handling to restart workers in a cluster.
Unit tests:
$ npm testTest Coverage:
$ npm run-script coverageMIT
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