websocket | Jakarta WebSocket - | Websocket library
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QUESTION
I built a docker container with Django, Uvicorn, Nginx and Redis, and am using django-channels but when I run this it says it cannot connect to the websocket and this is seen in the browser console:
WebSocket connection to 'ws://127.0.0.1:8080/ws/notifications/' failed
It is working fine when I use Django's runserver command for development but when I include Nginx and Uvicorn it breaks.
Entrypoint.sh:
...ANSWER
Answered 2022-Mar-26 at 10:20As noted in a comment by Iain Shelvington, it seems like websockets are not included in the base install of uvicorn
QUESTION
I have a ratchet WebSocket server, whose entityManager
is initialized from the backend. However, if some changes happen from one of the front-ends since the state of the entityManager
of the WebSocket server is different from the backend, the new changes are not reflected in the data that is served by the WebSocket server.
For this purpose, I wrote some listeners on the backend that listen for changes in these entities in and then send a request to the server like so:
...ANSWER
Answered 2022-Mar-08 at 15:30Doctrine uses the identity map
The websocket server is a daemon and all cleanup tasks are the responsibility of the developer
Use
\Doctrine\ORM\EntityManager::find
with the $lockMode
argument = \Doctrine\DBAL\LockMode::NONE
OR
Call the \Doctrine\ORM\EntityManager::clean
method before \Doctrine\ORM\EntityManager::find
QUESTION
I know there are a lot of questions and answeres regarding this topic out there, but nothing matched my specific issue.
I am using the following versions
- Angular 10.0.14
- @aspnet/signalr 1.0.27
- ASP.NET Core 3.1
VERSION UPDATE:
- I just replaced @aspnet/signalr 1.0.27 by @microsoft/signalr 5.0.11 -> same issue.
The SignalR connection works pretty fine until I add an accessTokenFactory in the Angular frontend.
Frontend
...ANSWER
Answered 2021-Oct-19 at 12:06Browsers do not support headers for websockets, therefore the bearer token has to be added as query string parameter. We hit the maximum length for URLs due to the length of our bearer token. We could shorten our token or use a reference token, see also: https://github.com/aspnet/SignalR/issues/1266
Hope this helps others as well.
QUESTION
I am running currently a webserver with ASP.NET Core 3.1 and a Blazor project. Recently when upgrading to .NET 6.0 I encountered (even with a blank Blazor project) some problems with a websocket error message in the browser only when deployed on my webserver (see message below).
Locally (on Windows 11 x64, VS 22 Preview 4) there are no error messages...
Webserver: Debian 10 x64, .NET 6.0 SDK installed, running on NGINX with websockets enabled (reverse proxy).
Do I miss out on something or is it a problem with the current state of .NET 6.0 and NGINX? I already tried to access the webpage locally on the debian server and the same error message occurs.
Help would be much appreciated!
Greetings!
Error messages within order:
...ANSWER
Answered 2022-Feb-26 at 12:07Here is the solution described again, maybe a little bit more convenient:
To fix this problem, I changed in the site-configuration (/etc/nginx/sites-available) of nginx the following variables:
QUESTION
I am implementing a simple chatbot using keras and WebSockets. I now have a model that can make a prediction about the user input and send the according answer.
When I do it through command line it works fine, however when I try to send the answer through my WebSocket, the WebSocket doesn't even start anymore.
Here is my working WebSocket code:
...ANSWER
Answered 2022-Feb-16 at 19:53There is no problem with your websocket route. Could you please share how you are triggering this route? Websocket is a different protocol and I'm suspecting that you are using a HTTP client to test websocket. For example in Postman:
HTTP requests are different than websocket requests. So, you should use appropriate client to test websocket.
QUESTION
I fail to enable the CORS for testing with the latest NestJS 8.0.6 and a fresh http + ws project. That said, I want to see the Access-Control-Allow-Origin
in the servers response (so that the client would accept it). Here is my main.ts where I've tried 3 approches: 1) with options, 2) with a method, 3) with app.use. None of them works.
ANSWER
Answered 2021-Sep-20 at 20:29The enableCors
and { cors: true }
options are for the HTTP server (express or fastify). The URL given showing the CORS error came from a socket.io connection. To enable CORS for socket.io
you need to use the options in the @WebsocketGateway()
decorator, like
QUESTION
Forgive me for the newb question, but I am confused and obviously not understanding the fundamentals or explanations of how to use a Websocket server hosted over HTTPS
. Everything I find online leads me to have more questions than answers.
I have a Websocket server hosted on my HTTPS
website using Java code.
This is my WebsocketServer.java
file:
ANSWER
Answered 2022-Jan-13 at 14:50Keep it easy.
Certs inside your application are complex - they are hard to manage and you will get problems to run your application in a modern cloud environment (start new environments, renew certs, scale your application, ...).
Simple conclusion: Dont implement any certs.
How-to get encrypted connections?As Mike already pointed out in the comments: WebSockets are just upgraded HTTP(S) connections. A normal webserver (nginx, apache) takes care about the certs. It can be done in kubernetes (as ingress-controller) or with a "bare-metal" webserver.
Both of them should act as a reverse-proxy. This means: Your java-application doesn't know anything about certs. It has just unencrypted connections - like in your code on port 6868
.
But the client will not use this port. 6868
is only internally reachable.
The client will call your reverse-proxy at the normal HTTPS port (=443). The reverse-proxy will forward the connection to your java-application.
Here some links for further information:
QUESTION
I have a task, but I can't seem to get it done. I've created a very simple WebRTC stream on a Raspberry Pi which will function as a videochat-camera. With ionic I made a simple mobile application which can display my WebRTC stream when the phone is connected to the same network. This all works.
So right now I have my own local stream which shows on my app. I now want to be able to broadcast this stream from my phone to a live server, so other people can spectate it.
I know how to create a NodeJS server which deploys my webcam with the 'getUserMedia' function. But I want to 'push' my WebRTC stream to a live server so I can retrieve a public URL for it.
Is there a way to push my local Websocket to a live environment? I'm using a local RTCPeerConnection to create a MediaStream object
...ANSWER
Answered 2021-Dec-10 at 16:54Is there a way to push my local Websocket to a live environment?
It's not straightforward because you need more than vanilla webrtc (which is peer-to-peer). What you want is an SFU. Take a look at mediasoup.
To realize why this is needed think about how the webrtc connection is established in your current app. It's a negotiation between two parties (facilitated by a signaling server). In order to turn this into a multi-cast setup you will need a proxy of sorts that then establishes separate peer-to-peer connections to all senders and receivers.
QUESTION
With ajax requests it can be done with this code:
...ANSWER
Answered 2021-Dec-09 at 17:16The question/bounty/op is specifically asking for a reputable source. Instead of rolling a custom solution, my proposal is that a known proven library should be used - that has been used, audited, forked, and in general used by the community and that is hosted on github.
The second option is to roll your own (though not recommended) and there are many exccelent answers on how to do it involving the addEventListener
Wshook is a library (hosted on github) that allows to easily intercept and modify WebSocket requests and message events. It has been starred and forked multiple times.
Disclaimer: I don't have any relationship with the specific project.strong text
Example:
QUESTION
I would like to know how many TCP connections are created when WebSocket call is made from browser to apache http server to backend web service?
Does it create a separate TCP connection from the browser to apache http server and from apache to the web service?
...ANSWER
Answered 2021-Oct-18 at 14:57When Apache is proxying websockets, there is 1 TCP connection between the client and Apache and 1 TCP connection between Apache and the backend.
Apache watches both connections for activity and forwards read from one onto the other.
This is the only way it can be in a layer 7 (Application Layer, HTTP) proxy. Something tunnelling at a much lower layer, like a NAT device or MAC forwarding IP sprayer could tunnel a single connection -- but not on the basis of anything higher up in the stack like headers.
The 2nd connection is observable with netstat.
The 2nd connection is opened when mod_proxy_wstunnel calls ap_proxy_connect_to_backend() which calls apr_socket_create() which calls the portable socket() routine. When recent releases of mod_proxy_http handle this tunneling automatically, simialr flow through ap_proxy_acquire_connection.
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Vulnerabilities
No vulnerabilities reported
Install websocket
You can use websocket like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the websocket component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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