I try to use the slack-sample bot from this blogpost https://www.opsdash.com/blog/slack-bot-in-golang.html . I've successfully created my api token, but i can not connect to the websocket server (the rtm.start request passs normally). I've get the error message
dial tcp 54.242.95.213:443: connectex: No connection could be made because the target machine actively refused it
I've also tried to connect via a chrome app called Simple Web Socket Client and via a website based one tester. Both work well, i can establish a connection and i can send data.
I'm behind a proxy, but i only have troubles with golang's websocket.Dial function.
Does anybody know why this can happen?
I use:
- Windows 7 SP1 x64
- Golang 1.7.1 windows/amd64
Greetings
Tonka
If you are using gorilla/websocket, it has the ability to use a Proxy. From issue 107:
import "net/http"
...
var dialer = websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
}
If you are using golang.org/x/net you should switch to gorilla/websocket.
Related
I'm a beginner in Rust and WebSockets and I'm trying to deploy on Heroku a little chat backend I wrote (everything works on localhost). The build went well and I can see the app is running, and I'm now trying to connect to the WebSocket from a local HTML/Javascript frontend, but it is not working.
Here is my code creating the WebSocket on my rust server on Heroku (using the tungstenite WebSocket crate):
async fn main() -> Result<(), IoError> {
let port = env::var("PORT").unwrap_or_else(|_| "8080".to_string());
let addr = format!("0.0.0.0:{}", port);
// Create the event loop and TCP listener we'll accept connections on.
let try_socket = TcpListener::bind(&addr).await;
let listener = try_socket.expect("Failed to bind");
println!("Listening on: {}", addr);
and here is the code in my Javascript file that tries to connect to that WebSocket:
var ws = new WebSocket("wss://https://myappname.herokuapp.com/");
My web client gets the following error in the console:
WebSocket connection to 'wss://https//rocky-wave-51234.herokuapp.com/' failed
I searched to find the answer to my issue but unfortunately didn't find a fix so far. I've found hints that I might have to create an HTTP server first in my backend and then upgrade it to a WebSocket, but I can't find a resource on how to do that and don't even know if this is in fact the answer to my problem. Help would be greatly appreciated, thanks!
I think your mistake is the URL you use:
"wss://https://myappname.herokuapp.com/"
A URL usually starts with <protocol>://. The relevant protocols here are:
http - unencrypted hypertext
https - encrypted hypertext
ws - unencrypted websocket
wss - encrypted websocket
So if your URL is an encrypted websocket, it should start only with wss://, a connection cannot have multiple protocols at once:
"wss://myappname.herokuapp.com/"
I have a gRPC client written in GoLang that I'm running on raspberryPI 4 (armv7l).
When I run the client on my MacBook it connects to the server and everything is fine.
When I run the same client on RaspberryPI 4, I get an error:
transport: authentication handshake failed: tls: server selected unadvertised ALPN protocol
Looking at the standard library, I checked that this check fails:
https://github.com/golang/go/blob/346b18ee9d15410ab08dd583787c64dbed0666d2/src/crypto/tls/handshake_client_tls13.go#L399
Function checkALPN is defined here: https://github.com/golang/go/blob/346b18ee9d15410ab08dd583787c64dbed0666d2/src/crypto/tls/handshake_client.go#L752
I printed clientProtos []string, serverProto string and it turns out that when code is run on MacBook, clientProtos contains h2 (which stands for HTTP2) and serverProto is h2 which is fine, they match and the connection gets established according to protocol.
When the same code is run on RaspberryPI, clientProtos is http/1.1 and server proto is h2 (gRPC connection can be established only over HTTP2) so there's a mismatch so the client fails to connect and says "server selected unadvertised ALPN protocol" which makes total sense. Any hints on how to proceed? Is there a reason why the client on RaspberryPI doesn't want to use HTTP2? Or maybe I have to set it somewhere? Or install something? Not sure how to proceed here and Google doesn't help. I also tried compiling client code with GoLang 1.16 but got the same error
I tried to connect to the Push API in poloniex using python and followed the instructions on the answer here:
How to connect to poloniex.com websocket api using a python library
However I keep getting this error:
2017-06-25T04:07:04 dropping connection to peer tcp:104.20.13.48:443 with abort=True: WebSocket opening handshake timeout (peer did not finish the opening handshake in time)
Anyone know what's going on here? I can't figure it out from online documentation. Thanks!
As per #Cyphrags suggestion, I was able to get my autobahn websocket to work outside of localhost by increasing openHandshakeTimeout with factory.setProtocolOptions
factory.protocol = MyClientProtocol
factory.setProtocolOptions(failByDrop=False, openHandshakeTimeout=90, closeHandshakeTimeout=5)
Solution found via https://github.com/crossbario/crossbar/issues/930. Perhaps the reason it is needed has something to do with slow DNS routing taking longer than the default handshake time.
1-Xampp
2-laravel 5.1
3-run localhost:8000
class in function
$redis = LRedis::connection();
$redis->publish('message', "fgfgff");
error
ConnectionException in AbstractConnection.php line 155:
No connection could be made because the target machine actively refused it. [tcp://127.0.0.1:6379]
If you are trying to create a connection between 2 host Redis is not an answer for you.
check out this question about what is Redis:
What is Redis and what do I use it for?
The problem with the Connection is probably because of the URL sending to the client side socket constructor.
change : var socket = io('http://localhost');
to : var socket = io();
Here is a link on step by step guide to use socket.io:
search "use socket.io with laravel" in Google.
To use connection between 2 host with Laravel you should use a package as it is not in Laravel by default.
this package enables push notification between server and devices like android or ios phones. here is the link to the package in GitHub:
davibennun/laravel-push-notification
Hope to be useful.
good luck.
I am using autobahn websocket library in android app and it turns out that connection works well in subnet like 192.168.1.XXX,but why it doesn't work when I tried to use the remote IP address .