Questions tagged [websocket]
WebSocket is an API built on top of TCP sockets and a protocol for bi-directional, full-duplex communication between client and server without HTTP overhead.
websocket
28,382
questions
1214
votes
8
answers
331k
views
WebSockets vs. Server-Sent events/EventSource [closed]
Both WebSockets and Server-Sent Events are capable of pushing data to browsers. To me they seem to be competing technologies. What is the difference between them? When would you choose one over the ...
- 35.4k
1189
votes
4
answers
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What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
I have tried reading some articles, but I am not very clear on the concepts yet.
Would someone like to take a shot at explaining to me what these technologies are:
Long Polling
Server-Sent Events
...
- 15.6k
695
votes
12
answers
335k
views
Differences between socket.io and websockets
What are the differences between socket.io and websockets in
node.js?
Are they both server push technologies?
The only differences I felt was,
socket.io allowed me to send/emit messages by ...
- 8,208
453
votes
3
answers
247k
views
Which websocket library to use with Node.js? [closed]
Currently there is a plethora of websocket libraries for node.js, the most popular seem to be:
https://github.com/Worlize/WebSocket-Node
https://github.com/einaros/ws
https://github.com/LearnBoost/...
- 47.7k
451
votes
6
answers
204k
views
WebSockets protocol vs HTTP
There are many blogs and discussions about WebSocket and HTTP, and many developers and sites strongly advocate WebSockets, but I still can not understand why.
For example (arguments of WebSocket ...
- 10.1k
447
votes
10
answers
153k
views
Does HTTP/2 make websockets obsolete?
I'm learning about HTTP/2 protocol. It's a binary protocol with small message frames. It allows stream multiplexing over single TCP connection. Conceptually it seems very similar to WebSockets.
Are ...
- 11.9k
399
votes
18
answers
479k
views
HTTP headers in Websockets client API
Looks like it's easy to add custom HTTP headers to your websocket client with any HTTP header client which supports this, but I can't find how to do it with the web platform's WebSocket API.
Anyone ...
- 31.9k
323
votes
4
answers
123k
views
In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
I am building a small chat application for friends, but unsure about how to get information in a timely manner that is not as manual or as rudimentary as forcing a page refresh.
Currently, I am ...
- 6,298
305
votes
8
answers
153k
views
WebRTC vs WebSocket: If WebRTC can do Video, Audio, and Data, why do I need WebSocket? [closed]
So I'm looking to build a chat app that will allow video, audio, and text. I spent some time researching into WebSocket and WebRTC to decide which to use. Since there are plenty of video and audio ...
- 3,746
287
votes
6
answers
193k
views
Difference between socket and websocket?
I'm building web app that needs to communicate with another application using socket connections. This is new territory for me, so want to be sure that sockets are different than websockets. It seems ...
- 2,903
277
votes
1
answer
213k
views
What browsers support HTML5 WebSocket API?
I am going to develop an instant messaging application that runs in the browser.
What browsers support the WebSocket API?
- 2,787
274
votes
12
answers
352k
views
Debugging WebSocket in Google Chrome
Is there a way, or an extension, that lets me watch the "traffic" going through a WebSocket? For debugging purposes I'd like to see the client and server requests/responses.
- 22.8k
245
votes
12
answers
354k
views
Send message to specific client with socket.io and node.js
I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this:
client.send(message, ...
- 2,901
228
votes
7
answers
110k
views
Why use AJAX when WebSockets is available?
I've been using WebSockets for a while now, I have chosen to create an Agile project management tool for my final year project at University utilizing Node server and WebSockets. I found using ...
- 15.8k
222
votes
2
answers
188k
views
Differences between TCP sockets and web sockets, one more time [duplicate]
Trying to understand as best as I can the differences between TCP socket and websocket, I've already found a lot of useful information within these questions:
fundamental difference between ...
- 7,761
217
votes
4
answers
68k
views
What is the fundamental difference between WebSockets and pure TCP?
I've read about WebSockets and I wonder why browser couldn't simply open trivial TCP connection and communicate with server like any other desktop application. And why this communication is possible ...
- 2,866
210
votes
3
answers
135k
views
Good beginners tutorial to socket.io? [closed]
I am very new to the world of webdevelopment and jumped into the bandwagon because I find the concept of HTML5 very interesting. I am fairly confident on working with canvas and would now like to move ...
- 11.5k
197
votes
2
answers
150k
views
How do you inspect websocket traffic with Chrome Developer Tools? [duplicate]
I'm trying to inspect websocket traffic using Chrome Developer Tools. From my research it seems you should be able to see it using the network tab - and it even has a filter for 'ws'.
However I've ...
- 6,031
190
votes
13
answers
252k
views
node.js, socket.io with SSL
I'm trying to get socket.io running with my SSL certificate however, it will not connect.
I based my code off the chat example:
var https = require('https');
var fs = require('fs');
/**
* Bootstrap ...
- 2,070
187
votes
6
answers
176k
views
Maximum concurrent Socket.IO connections
This question has been asked previously but not recently and not with a clear answer.
Using Socket.io, is there a maximum number of concurrent connections that one can maintain before you need to add ...
- 14.4k
185
votes
12
answers
242k
views
WebSocket: How to automatically reconnect after it dies
var ws = new WebSocket('ws://localhost:8080');
ws.onopen = function () {
ws.send(JSON.stringify({
.... some message the I must send when I connect ....
}));
};
ws.onmessage = function (e) {...
- 19.7k
184
votes
4
answers
188k
views
Sending websocket ping/pong frame from browser
I keep reading about ping/pong messages in websockets to keep the connection alive, but I'm not sure what they are. Is it a distinct frame type? (I don't see any methods on a javascript WebSocket ...
- 10.3k
180
votes
2
answers
87k
views
How many system resources will be held for keeping 1,000,000 websocket open? [closed]
Websocket is good, but would it be able to handle 1,000,000 concurrent connections?
How many system resources will be needed for keeping 1,000,000 websocket open?
Thanks!
- 1,865
176
votes
5
answers
95k
views
What is the difference between WebSocket and STOMP protocols?
What are the major differences between WebSocket and STOMP protocols?
- 1,781
171
votes
5
answers
47k
views
Do HTML WebSockets maintain an open connection for each client? Does this scale?
I am curious if anyone has any information about the scalability of HTML WebSockets. For everything I've read it appears that every client will maintain an open line of communication with the server. ...
- 14.8k
164
votes
6
answers
194k
views
How can I get the sha1 hash of a string in node.js?
I'm trying to create a websocket server written in node.js
To get the server to work I need to get the SHA1 hash of a string.
What I have to do is explained in Section 5.2.2 page 35 of the docs.
NOTE:...
- 2,926
156
votes
4
answers
54k
views
My Understanding of HTTP Polling, Long Polling, HTTP Streaming and WebSockets
I have read many posts on SO and the web regarding the keywords in my question title and learned a lot from them. Some of the questions I read are related to specific implementation challenges while ...
- 3,240
153
votes
3
answers
103k
views
Which WebSocket library to use in Android app? [closed]
I want to add a Service to my Android app which runs in the background holding a WebSocket connection (possibly over several hours or even days) and regularly sends some data to a server.
Now there ...
- 3,309
145
votes
8
answers
412k
views
Getting the reason why websockets closed with close code 1006
I want to get the reason websockets closed so that I can show the right message to the user.
I have
sok.onerror=function (evt)
{//since there is an error, sockets will close so...
sok....
- 4,272
144
votes
3
answers
76k
views
Loadbalancing web sockets
I have a server which supports web sockets. Browsers connect to my site and each one opens a web socket to www.mydomain.example. That way, my social network app can push messages to the clients.
...
- 3,157
143
votes
7
answers
228k
views
Closing WebSocket correctly (HTML5, Javascript)
I am playing around with HTML5 WebSockets. I was wondering, how do I close the connection gracefully? Like, what happens if user refreshes the page, or just closes the browser?
There is a weird ...
- 30.8k
138
votes
4
answers
206k
views
WebSocket with SSL
Is it possible to have WebSockets with HTTPS?
When switching to HTTPS, my WebSocket returns a security error and works perfectly with regular HTTP.
Below, a snippet;
socket = new WebSocket("ws://...
- 10.2k
138
votes
2
answers
109k
views
What is the difference between grpc and websocket? Which one is more suitable for bidirectional streaming connection?
I want to develop a client-server application in a bi-directional streaming manner.
what is more suitable technology for this, grpc or websocket?
- 1,809
136
votes
14
answers
213k
views
WebSockets and Apache proxy: how to configure mod_proxy_wstunnel?
I have :
Apache 2.4 on port 80 of my server, with mod_proxy and mod_proxy_wstunnel enabled
Node.js + socket.io on port 3001 of the same server
Accessing example.com (with port 80) redirects to 2. ...
- 43.8k
129
votes
3
answers
68k
views
Differences between webhook and websocket?
I've always wanted to do a real-time chat.
I've done that years ago in PHP+Ajax+Mysql and broke my server.
Then I tried with Flash+ a text file. I gave up and haven't tried in 10 years. But recently I ...
- 3,880
129
votes
6
answers
310k
views
javax.websocket client simple example
Can someone please provide me very simple example of websocket client using javax.websocket?
I want to connect to websocket (ws://socket.example.com:1234), send message (add channel) and listen to ...
- 6,897
128
votes
5
answers
275k
views
How to create websockets server in PHP
I am looking for a simple code to create a WebSocket server. I found phpwebsockets but it is outdated now and doesn't support the newest protocol. I tried updating it myself but it doesn't seem to ...
- 32k
125
votes
9
answers
147k
views
How to construct a WebSocket URI relative to the page URI?
I want to construct a WebSocket URI relative to the page URI at the browser side. Say, in my case convert HTTP URIs like
http://example.com:8000/path
https://example.com:8000/path
to
ws://example....
- 9,442
120
votes
2
answers
63k
views
Differences between websockets and long polling for turn based game server
I am writing a server for an iOS game. The game is turn-based and the only time the server needs to push information to the client is to notify of the opponent's move.
I am curious if anyone could ...
- 1,517
119
votes
5
answers
221k
views
Is there a WebSocket client implemented for Python? [closed]
I found this project: http://code.google.com/p/standalonewebsocketserver/ for a WebSocket server, but I need to implement a WebSocket client in python, more exactly I need to receive some commands ...
- 30.4k
117
votes
13
answers
135k
views
webSocketServer node.js how to differentiate clients
I am trying to use sockets with node.js, I succeded but I don't know how to differentiate clients in my code.
The part concerning sockets is this:
var WebSocketServer = require('ws').Server,
wss ...
- 9,961
114
votes
9
answers
62k
views
Websocket API to replace REST API? [closed]
I have an application whose primary function works in real time, through websockets or long polling.
However, most of the site is written in a RESTful fashion, which is nice for application s and ...
- 53.9k
114
votes
1
answer
37k
views
Xmpp Vs Websocket [closed]
I'm about to develop a website that has near real time chat. I know that it can be implemented using xmpp or websocket protocols. I know also that the xmpp protocol has been developed in 1999 , and I ...
- 1,547
113
votes
5
answers
77k
views
WebSockets ping/pong, why not TCP keepalive?
WebSockets have the option of sending pings to the other end, where the other end is supposed to respond with a pong.
Upon receipt of a Ping frame, an endpoint MUST send a Pong frame in
response, ...
- 178k
110
votes
9
answers
109k
views
Reconnection of Client when server reboots in WebSocket
I am using web socket using PHP5 and the Chrome browser as client.
I have taken the code from the site http://code.google.com/p/phpwebsocket/.
I run the server, and the client is also connected. I ...
- 1,857
106
votes
5
answers
143k
views
Sending message to a specific connected users using webSocket?
I wrote a code for broadcasting a message to all users:
// websocket and http servers
var webSocketServer = require('websocket').server;
...
...
var clients = [ ];
var server = http.createServer(...
- 147k
103
votes
3
answers
32k
views
Faye vs. Socket.IO (and Juggernaut)
Socket.IO seems to be the most popular and active WebSocket emulation library. Juggernaut uses it to create a complete pub/sub system.
Faye is also popular and active, and has its own javascript ...
- 22.6k
103
votes
11
answers
92k
views
HTTP Authorization Header in EventSource (Server Sent Events)
I need to set an Authorization header to an HTML5 EventSource. As Server Sent Events seems to be disused since Websockets appeared, I cannot find any useful documentation. The approach I have already ...
- 8,307
100
votes
3
answers
150k
views
Websocket onerror - how to read error description?
I've been developing browser-based multi player game for a while now and I've been testing different ports accessibility in various environment (client's office, public wifi etc.). All is going quite ...
- 3,058
100
votes
5
answers
268k
views
Creating a "Hello World" WebSocket example
I don't understand why I cannot make the following code work. I want to connect with JavaScript to my server console application. And then send data to the server.
Here is the server code:
...
- 35.1k