I'm working on an application that uses the http-kit client library and I think it's generating requests that have a problem. Since the requests go over https, I can't just sniff them and I also couldn't find a way to make http-kit use a proxy, such as Charles, to see the contents of the packages.
Is there any way to see them? I want to compare them to the same requests in Chrome.
This actually works with http-kit and it outputs a lot of information: http://docs.oracle.com/javase/7/docs/technotes/guides/security/jsse/ReadDebug.html
In short, add this when calling Java to run Clojure:
-Djavax.net.debug=all
Related
I am currently developing an instant messaging feature for my apps (ideally cross platform mobile app/web app), and I am out of ideas to fix my issue.
So far, I have been able to make everything work locally, using a Node.js server with socket.io, django, and redis, following what most tutorials online suggest.
The step I am now at consists in putting all that in the cloud using amazon AWS. My Django server is up and running, I created a new separate Node.js server, and I am using Elasticache to handle the Redis part. I launch the different parts, and no error shows up.
However, whenever I try using my messaging feature on the web, I keep getting an error 500:
handshake error
I then used the console to check the request header, and I observed that the cookies are not in there, contrary to when I am on localhost. I know it is necessary to authorize the handshake, so I guess that's where my error is coming from..
Furthermore, I have also checked that the cookies do exist, they are just not set in the request header.
My question is then: How can I make sure Django or socket client (not sure who's responsible here..) puts the cookies in the header??
One of my ideas was that maybe I am supposed to put everything on the same server, with different ports, instead of 2 separate servers? Documentation on that specific architecture problem is surprisingly scarce, compared to the number of tutorials describing how to make it work on local.
I hope I described the problem accurately enough! :)
Important note: I am using socket.io v0.9.1-1, only one compatible with a titanium mobile app.
Thank you for any help!
All right, so I've made some progress.
The cookie problem came from the fact I was making cross-domain request, adding a few lines enabled CORS, which didn't solve the cookie issue, but allowed me to communicate between servers (basically I set the headers of the response using express. I then passed necessary data in the query, even if not the most secure way to do it, I'm just building an MVP, and it's enough for now.
I haven't been able to make the chat work from my Titanium mobile app, but since I can use a webview to handle it, I will be fine.
Hopefully that will help someone.. If anyone needs me to post some code snippets I will gladly do so upon request!
Cheers
Is it possible to communicate from a web browser(Loaded an HTM page from server) to an application running in the same server using AJAX. Need to send the request from browser using a button click and update the page with responses received from one another application running in the same server machine?
I am using HTML pages to create website and not using any PHP or ASP like server side scripting. In server machine data are manipulated using a C++ application.
I think you can use any sort of Javascript functions to do that. But you might need to use jQuery or similar frameworks to make your live easier. You might need to search for "Comet Programming" to know exactly how to do 2-way communication between client and server
Updated:
Well, this kind of stuff requires you to read a lot (if you have not already known). Basically, what you need is a server that can do long-polling (or eventsource, websockets). There are many open-source ones that might help you to get started. I can list a several good ones here. There are a lot more
http://www.ape-project.org/
http://cometd.org/
http://socket.io/
http://code.google.com/p/erlycomet/
http://faye.jcoglan.com/
So after you have the comet server up and running you will need to setup the client side (probably Javascript). For those listed projects, most of them come with the client side code to interact with the server (Except for erlycomet). Therefore, you can just use the examples provided and run a quick prototype. If you want to use your raspberry pi, you can use nodejs which provide a lot of ease for dealing with real-time communication (socket.io, faye). And lately, http://www.meteor.com/
I would think of the problem this way: you want to provide a web front end to an existing c++ application. To achieve this you need to think about how your web server communicates with your c++ application. Communication between the browser and web server can be thought of as a separate problem - as you say AJAX calls can be used, or maybe have a look at websockets.
Once you have your request in the web server you need to communicate it to the C++ application (and/or visa versa). This can be done a number of ways, e.g. sockets or RPC. I found this question here which has some good advice.
My C++ program launches Internet Explorer (it works with IE6 up to IE10) to display some web page on the Internet; I have no way to modify the web page. The web page references a JavaScript file (using a <script> tag in the HTML markup) - a copy of the swfobject JavaScript library. I'd like the web page to use a custom copy of this file which I provide.
I came up with two possible ways to tackle this
Write a proxy server which Internet Explorer connects to; the proxy fetches the actual data and then rewrites the HTML so that my own copy of swfobject is referenced. This is unfortunately quite a bit of work, and probably won't work with https. I could live without support for https for now.
Implement a asynchronous protocol plugin for Internet Explorer which intercepts all http requests. I know that the JavaScript file is always retrieved using http, so I could intercept accesses to the swfobject JavaScript file and yield my own file instead. Alas, this seems to be impossible as well, a Microsoft support page explains
Internet Explorer ignores naive attempts to overwrite HKEY_CURRENT_ROOT\PROTOCOLS\Http with a value other than the CLSID for
This sounds like hooking 'http' with a custom protocol handler won't work; in any case, this approach would also be problematic in case there is an existing http protocol handler.
Is there a better way to solve this than either of these two?
Depending on the complexity of your requirements, Fiddler may be a useful alternative to a custom proxy since it can automatically rewrite both requests and responses and can be a quick way of scripting what you want.
It also works well with HTTPS, so that part is "free".
Want to have Fiddler automatically rewrite requests and responses, add or remove headers, or flag/ignore sessions based on rules you specify? Check out the FiddlerScript Cookbook
Here is a link to the cookbook
If you need to embed it, it can also be embedded as FiddlerCore.
As #MSalters points out below, the Fiddler's optional SSL interception is something you should consider the trade-offs of before using it. It's documented here and I've written up a short summary of how it works in this answer.
Just shooting down an idea, it's possible to hook the WinSock send() and recv() function in your own process. This is a kind of man in the middle.. This solution has a high complexity drawback tho.
Easy, just translate the URL. Change the swfobject URL to a file:// URL, pointing at your copy.
(You're not actually launching IExplorer.EXE, are you? That's not how you're supposed to open web pages. You either launch a URL with ShellExecute, leaving the browserchoice to the user, or you embed MSHTML, IE's core, in your own app. Internet Explorer isn't part of Windows and may be absent, eg on Windows N.)
Do you think it would be possible to embed a HTTP server inside a Google Chrome extension?
I've seen other Google Chrome extensions execute native code and apparrently they do it by using NPAPI, but I have no idea what that is. And it's really freaking me out, as I'm no C++ expert or anything like that. So I feel a little stuck now and that's why I'm asking for help.
Specifically, I want to create an extension for Chrome with features similar to Opera Unite. For those who don't know what I'm talking about: Opera Unite is basically a zero-conf web server bundled with the browser. I don't want to use it for the same things Opera does, but I like the concept.
I was thinking about using something like node.js inside the browser to create a simple web interface to control some stuff in the browser. Think of it as a remote control for the browser. If node.js isn't possible I'd like to use lighthttpd or something similar. The technology really doesn't matter as long as it allows me to receive commands over HTTP.
But how do I take an existing web server and make a NPAPI plugin out of it?
Clarification: I'd like any browser to be able to communicate with my extension. Especially I want mobile devices like Android or the iPhone to be able to remote control the browser. Is there any other way to accomplish that except with a HTTP server?
Another update: I think the easiest way to do this would be to use a relay server on the web like Pusher or some self-created service. But I don't like this approach because it requires constant internet access and because it's a paid service.
Thank you all!
If you want to do a remote control for the browser, would something like HTML5 WebSockets work for you?
http://www.html5rocks.com/tutorials/websockets/basics/
You can have an external "remote" server that your extension listens to via WebSockets. If you want to host a webserver via extensions. You would need to use NPAPI, there are many C++ libraries out there (Google search) that can do a simple webserver. But I would rather use WebSockets communicate to an external server which will provide you anything you want.
But if you insist, you would need to learn C++, NPAPI, there are many examples online regarding NPAPI.
Here is another web server implemented with chrome.socket: https://github.com/kzahel/web-server-chrome. The server example linked to in chrome-app-samples is actually really buggy and will lock up if you e.g. hold down Ctrl-R on a page served by it.
Here is info on making a web-server in a Chrome app:
https://developers.google.com/live/shows/7320022-5001
I need to build a lightweight http server for my application basically it's a server which listen to a port and outputs a status information on requests, https, other functionality. But I would like to know first if something like this existe in C++, for linux and open source.
Does anyone know a program like that?
Thanks.
EDIT: It should be able to support high load.
If you can use boost, the asio library provides an http example. It does not use SSL, but asio can use OpenSSL very easily.
If you want to handle high loads I would suggest following:
Use proper web server with all goodies it comes with like Lighttpd, Nginx or Apache (in that order).
It would do great job in serving static files and handle your application. And they are very lightweight.
Write an Application in C++ using proper web framework - CppCMS - that is designed for high loads
Connect Web Application to the server via FastCGI or SCGI protocol (in this order).
Disclaimer: I'm the author of CppCMS
A quick google search for "C++ web application framework" shows things called CppCMS and something else called WT. That might get you started.
Or, as Sam already answered: boost.asio comes with a HTTP example that may be sufficient if your needs are simple. (Real HTTP request handling is actually surprisingly complex: http://webmachine.basho.com/diagram.html )
See thttpd. Supposibly the fastest open source file server on all machines with a single CPU.
If not using HTTPS, it's about a two hour exercise to write a static file server.