websocket: bad handshake with gorilla websockets

Question

i have a websocket server running on railway with a custom domain, and when going to the websocket route in the browser, i get the expected error:

Bad Request
websocket: the client is not using the websocket protocol: 'upgrade' token not found in 'Connection' header

so i think the server is exposed correctly.

however, when connecting using my cli app with the gorilla websockets package, i get this error:

2023/09/19 18:30:04 websocket: bad handshake
exit status 1

i'm not entirely sure why.

code for connecting:

package client

import (
    "fmt"
    "net/url"
    "os"
    "os/signal"

    "github.com/gorilla/websocket"
)

type StartRequest struct {
    MetaApiKey  string  `json:"META_API_KEY"`
    RiskPercent float64 `json:"RISK_PERCENT"`
    AccountId   string  `json:"ACCOUNT_ID"`
    BrokerSuffix string `json:"BROKER_SUFFIX"`
}

func Connect() (*websocket.Conn, chan struct{}, error) {
    interrupt := make(chan os.Signal, 1)

    signal.Notify(interrupt, os.Interrupt)

    u := url.URL{Scheme: "ws", Host: os.Getenv("SERVER_HOST"), Path: "/websocket"}

    fmt.Println(u.String())

    c, _, err := websocket.DefaultDialer.Dial(u.String(), nil)

    if err != nil {
        return &websocket.Conn{}, make(chan struct{}, 0), err
    }

    done := make(chan struct{}, 1)

    go func() {
        <-done

        c.Close()
    }()

    return c, done, nil
}

websocket: bad handshake with gorilla websockets

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