consolidate proxy connect errors

ngrok/src/session.rs

@@ -247,7 +247,7 @@ fn connect_http_proxy(url: Uri) -> impl Connector {
         let connector = HttpConnector::new();
         async move {
             let mut connector = ProxyConnector::from_proxy(connector, proxy)
-                .map_err(|e| ConnectError::ProxyUnsupportedError(format!("{e}")))?;
+                .map_err(|e| ConnectError::ProxyConnect(Box::new(e)))?;
 
             let server_uri = format!("http://{host}:{port}").parse().unwrap();
 
@@ -339,10 +339,7 @@ pub enum ConnectError {
     /// An error occurred when rebinding tunnels during a reconnect
     #[error("error rebinding tunnel after reconnect")]
     Rebind(#[source] RpcError),
-    /// An error arising from a misconfigured proxy
-    #[error("unsupported proxy address: {0}")]
-    ProxyUnsupportedError(String),
-    /// An error arising from a misconfigured proxy
+    /// An error arising from a failure to connect through a proxy.
     #[error("failed to connect through proxy")]
     ProxyConnect(#[source] Box<dyn std::error::Error + Send + Sync + 'static>),
     /// The (re)connect function gave up.