Document compression layers

Author: sbernauer

trino-lb/src/http_server/mod.rs

@@ -130,9 +130,10 @@ pub async fn start_http_server(
         .route("/ui/index.html", get(ui::index::get_ui_index))
         .route("/ui/query.html", get(ui::query::get_ui_query))
         .layer(TraceLayer::new_for_http())
-        // E.g. "/v1/trino-event-listener" get's compressed data from Trino
+        // The Trino HTTP events (received at `/v1/trino-event-listener`) are compressed by default, so we need to need
+        // to be able to accept compressed content
         .layer(RequestDecompressionLayer::new())
-        // Trino clients can ask for compressed data
+        // Trino clients can ask for compressed data, so we should support compressing the response
         .layer(CompressionLayer::new())
         .with_state(app_state);