ruffsl

FROM ros:indigo-ros-base
# install ros tutorials packages
RUN apt-get update && apt-get install -y \
    ros-indigo-ros-tutorials \
    ros-indigo-common-tutorials \
    && rm -rf /var/lib/apt/lists/

subudeepak

WebSockets - An Introduction

WebSockets is a modern HTML5 standard which makes communication between client and server a lot more simpler than ever. We are all familiar with the technology of sockets. Sockets have been fundamental to network communication for a long time but usually the communication over the browser has been restricted. The general restrictions

• The server used to have a permanent listener while the client (aka browser) was not designated any fixed listener for a more long term connection. Hence, every communication was restricted to the client demanding and the server responding.
• This meant that unless the client requested for a particular resource, the server was unable to push such a resource to the client.
• This was detrimental since the client is then forced to check with the server at regular intervals. This meant a lot of libraries focused on optimizing asynchronous calls and identifying the response of asynchronous calls. Notably t

kethinov

// List all files in a directory in Node.js recursively in a synchronous fashion
var walkSync = function(dir, filelist) {
  var fs = fs || require('fs'),
      files = fs.readdirSync(dir);
  filelist = filelist || [];
  files.forEach(function(file) {
    if (fs.statSync(dir + file).isDirectory()) {
      filelist = walkSync(dir + file + '/', filelist);
    }
    else {

vinoski

%% Simple web server.
-module(sws).
-author('Steve Vinoski <vinoski@ieee.org>').
-export([start/1, start/2]).

%% start/1 takes a handler function and starts the web server on port 8000.

%% start/2 takes a handler function and a port number. The handler function
%% takes two arguments: a TCP socket and request data. The request data is
%% a property list indicating the invoked HTTP method, the target URI, the