Created
November 1, 2013 15:05
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Simple forward proxy in node.js, which intercept calls and let you add custom scripts to live sites/web apps. In this example it is adding skewer script, so you can mess around with live pages from emacs.
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/** | |
* To run it you will need to install | |
* | |
* $ npm install http-proxy | |
*/ | |
var http = require('http'), | |
httpProxy = require('http-proxy'), | |
port = 3001, | |
proxiedHost = 'localhost', | |
proxiedPort = 3000, | |
server; | |
function filterResponseBody(res, filter) { | |
var forward = res.write.bind(res); | |
res.write = function(chunk) { | |
forward(filter(chunk)); | |
}; | |
} | |
server = httpProxy.createServer(function(req, res, proxy) { | |
proxy.proxyRequest(req, res, { | |
host: proxiedHost, | |
port: proxiedPort | |
}); | |
}); | |
server.proxy.on('start', function(req, res, response) { | |
console.log(req.headers.host, req.method, req.url); | |
if (req.url.match(/^\/(htmlcharts|htmlchartsviewer-weblib)\/(\?|$)/)) { | |
filterResponseBody(res, function(chunk) { | |
return String.prototype.replace.call(chunk, '<head>', '<head>\n <script src="localhost:8080/skewer"></script>'); | |
}); | |
} | |
}); | |
server.listen(port); | |
console.log("Started forward proxy. Go to http://localhost:" + port); |
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