use coder/websocket for everything, get rid of gobwas.

supposedly it is faster, and anyway it's better to use it since we're already using it for wasm/js.

(previously named nhooyr/websocket).

connection_options.go

@@ -0,0 +1,34 @@
+//go:build !js
+
+package nostr
+
+import (
+	"crypto/tls"
+	"net/http"
+	"net/textproto"
+
+	ws "github.com/coder/websocket"
+)
+
+var defaultConnectionOptions = &ws.DialOptions{
+	CompressionMode: ws.CompressionContextTakeover,
+	HTTPHeader: http.Header{
+		textproto.CanonicalMIMEHeaderKey("User-Agent"): {"github.com/nbd-wtf/go-nostr"},
+	},
+}
+
+func getConnectionOptions(requestHeader http.Header, tlsConfig *tls.Config) *ws.DialOptions {
+	if requestHeader == nil && tlsConfig == nil {
+		return defaultConnectionOptions
+	}
+
+	return &ws.DialOptions{
+		HTTPHeader:      requestHeader,
+		CompressionMode: ws.CompressionContextTakeover,
+		HTTPClient: &http.Client{
+			Transport: &http.Transport{
+				TLSClientConfig: tlsConfig,
+			},
+		},
+	}
+}