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LineRate snippet: Forward Proxy HTTP redirect
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/************************************************************************************************* | |
* Description: | |
* HTTP redirection in a forward-proxy context. A forward-proxy is useful for filter | |
* connections particularly outbound to the internet for clients sitting behind a | |
* firewall for example. In this example below, any user HTTP request from clients | |
* results in a redirection to the specified site (in this case a bland example.com site). | |
* More sophistication can be added like a login page for authenticating outbound/internet | |
* access and other enterprise policy enforcement. | |
*/ | |
"use strict"; | |
var fpm = require('lrs/forwardProxyModule'); | |
var redirectHost = 'www.example.com'; | |
// Handler for client requests - this pulls out the host field value | |
function onClientReq(servReq, servResp, next) { | |
// extract the full URL request from the header | |
var requestedHost = servReq.headers.host || ''; | |
/* Test if the URL request matches the redirection. | |
* Forward the request along on such a match thereby preventing | |
* a redirect loop. | |
*/ | |
if(requestedHost == redirectHost) { | |
next(); | |
} | |
else { | |
servResp.setHeader('Content-Type', 'text/html'); | |
servResp.writeHead(301, {'Location' : 'http://' + redirectHost, 'Server' : 'LineRate'}); | |
servResp.end(); | |
} | |
} | |
var onExists = function(fp) { | |
fp.on('request', onClientReq); | |
}; | |
fpm.on('exist', 'fp1', onExists); |
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