[ws client]: Handshake failed connecting to valid URL

[chevdor]

Considering the following example (not in the repo):

use jsonrpsee::ws_client::WsClientBuilder;
use std::env;

fn get_ws_node() -> String {
	env::var("POLKADOT_WS").unwrap_or("ws://localhost:9944".to_string())
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
	env_logger::init();

	let url = String::from(get_ws_node());
	println!("Connecting to {:?}", &url);
	let client = WsClientBuilder::default().build(&url).await?;
	assert!(client.is_connected());
        println!("connected");
	Ok(())
}

This will succeed:

POLKADOT_WS=wss://rpc.polkadot.io c run --example ws_polkadot  

But this will fail despite the endpoint to be valid and up:

POLKADOT_WS=wss://polkadot.api.onfinality.io/public-ws c run --example ws_polkadot
    Finished dev [unoptimized + debuginfo] target(s) in 0.13s
     Running `target/debug/examples/ws_polkadot`
Connecting to "wss://polkadot.api.onfinality.io/public-ws"
Error: Networking or low-level protocol error: Couldn't find any IP address for this hostname

Caused by:
    Couldn't find any IP address for this hostname

[niklasad1]

I could reproduce this, the server rejected handshake not exactly sure why:

[2021-05-10T14:15:07Z DEBUG rustls::client::hs] No cached session for DNSNameRef("polkadot.api.onfinality.io")
[2021-05-10T14:15:07Z DEBUG rustls::client::hs] Not resuming any session
[2021-05-10T14:15:07Z DEBUG rustls::client::hs] Using ciphersuite TLS13_CHACHA20_POLY1305_SHA256
[2021-05-10T14:15:07Z DEBUG rustls::client::tls13] Not resuming
[2021-05-10T14:15:07Z DEBUG rustls::client::tls13] TLS1.3 encrypted extensions: []
[2021-05-10T14:15:07Z DEBUG rustls::client::hs] ALPN protocol is None
[2021-05-10T14:15:07Z DEBUG rustls::client::tls13] Ticket saved
[2021-05-10T14:15:07Z DEBUG rustls::client::tls13] Ticket saved
[2021-05-10T14:15:07Z DEBUG jsonrpsee_ws_client::transport] Failed to connect to sockaddr: 34.249.193.87:443 with err: Rejected { status_code: 404 }

websocat works for this endpoint so it's bug somewhere, not sure where though

[niklasad1]

Closed by #335