http-intercept

Enhancement for Node's HTTP IncomingMessage & ServerResponse for data going from/to such streams to be intercepted - and modified... :)

Usage

Approach is pretty simple: just call the intercept method on either request or response and register for the "interception" event (or just pass your callback when calling intercept). When it is triggered you'll get the intercepted data. At that point you could do whatever you want with it, then normal flow of things will resume...

Let's say you want to change incoming data:

var HTTP = require("http");
var Query = require("querystring");
var read = require("concat-stream");
 
var server = HTTP.createServer(function(request, response) {
//*
    request.intercept(function(context) {
        context.buffer = "user=Jack";
    });
//*/
 
    request.pipe(read(function(data) {
        var query = Query.parse(String(data) || "");
        response.end("Hello, " + query.user + "!");
    }));
}).listen(80);

Note: post something like "user=Barnabé" and you'll see that it is turned into "Jack" in the greeting message.

var HTTP = require("http");
var Query = require("querystring");
var read = require("concat-stream");
 
var server = HTTP.createServer(function(request, response) {
    var user;
//*
    request.intercept(function(context) {
        user = Query.parse(String(context.buffer) || "").user;
        context.buffer = "user=Jack";
    });
//*/
 
//*
    response.intercept(function(context) {
        context.buffer = "Well... I guess you're not " + query.user + ", but " + user + ", right?";
    });
//*/
 
    var query;
 
    request.pipe(read(function(data) {
        query = Query.parse(String(data) || "");
        response.end("Hello, " + query.user + "!");
    }));
}).listen(80);