Could not establish a websocket connection through a proxy

[forsummer]

Unable to establish a websocket connection through a proxy, the code is as follows:

let intents = GatewayIntents::MESSAGE_CONTENT |
    GatewayIntents::GUILD_MESSAGES |
    GatewayIntents::DIRECT_MESSAGES;

let http = HttpBuilder::new(bot_token)
    .application_id(app_id)
    .proxy("http://localhost:7890")
    .map_or_else(|e| panic!("{}", e), |h| h.build());

let mut bot = ClientBuilder::new_with_http(http, intents)
    .event_handler(Handler)
    .await
    .expect("Build bot client failed");

bot.start()
    .await
    .expect("Bot connect success");

The error message is as follows:

Build bot client failed: Http(Request(reqwest::Error { kind: Request, url: Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("discord.com")), port: None, path: "/api/v10/gateway", query: None, fragment: None }, source: hyper::Error(Connect, ConnectError("tcp connect error", Os { code: 110, kind: TimedOut, message: "Connection timed out" })) }))

PS: Strangely enough, websocket connections can be established normally using wscat (via http proxy)