![]() Man - in - the - middle attacks can be thought about through a chess analogy. I guess the famous saying about journey being more more important than the destination fits nice here.In cryptography and computer security, a man - in - the - middle attack ( often abbreviated to MITM, MitM, MIM, MiM attack or MITMA ) is an attack where the attacker secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other. I think building an http sniffer is a great exercise in the process of learning how http(s) works. ![]() Maybe someday it will become a reasonable alternative for Charles - at least for me. a detailed view – both for request and response that can display headers, message body and a preview right in the browserĪlthough it still is a very simple (and buggy) application I actually found that it has most of features I frequently use – probably except for filtering.simple session list – a grid with list of request/response pairs that you can inspect.http and https support – although the latter one requires additional setup.Right now proxy-mirror has only couple of features: To browser part through socket.io where a simple SPA built with my beloved AngularJS displays information about them. The information about http traffic received from events is then pushed Those events are consumed by the second logical component –Ī web application built with express.js. ![]() The http proxy component emits events whenever a request or response goes through it. With it’s helped you can have a system wide proxy in couple of minutes. I didn’t want to focus on building that first so I utilized a great node module call http-proxy. The first is a regular http proxy that you can use by configuring your browser or system. You can think of proxy-mirror as 2 logical components. I picked node.js over java or ruby mainly because I wanted to sharpen my skills in it. I wanted to run proxy-mirror on many platforms and rely on a foundation that has both great support for http and building web applications. Right now it’s not very easy to try it out – the instructions are in the Readme – I’ll try to fix it soon. Here are some screen shoots of the the tool:Īs you might have guessed from screenshots proxy-mirror is a web application. It’s open source and I learned couple of new things about HTTP while implementing it – more on that in future posts. In terms of features and reliability – but it works (at least in most scenarios :-)). Of course this is a very simplistic http sniffer – nowhere near to tools I mentioned above both How hard would it be to actually build a simple http sniffer? proxy-mirror – a simple http inspectorĪs it turned out it’s actually not that hard to built one thus proxy-mirror came to be. As I was learning about http caching a question popped to my head. To dive a bit deeper and see http traffic on a tcp level WireShark is indispensable.Īs you can see there are plenty of tools available to help understand what is happening on http level. If you only need basic features ngrok might serve you well. Command line lovers might find mitmproxy suit their needs. Both Charles and HTTP Scoop aren’t free but in my opinion they are worth There is also a little less popular HTTP Scoop. ![]() The most advanced one offering most if not all features available in Fiddler. While it’s possible to use Fiddler on other platforms using virtualization software I think it’s an overkill. Whether to inspect a server response, optimize network usage or just to fiddle with new REST API it almost always make sense to use an application that can display http requests and responses for investigation.
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