diff --git a/backend/server.js b/backend/server.js
index 91fcb83b..7df41316 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -17,7 +17,7 @@ let expectedAudience = `/projects/${process.env.PROJECT_NUMBER}/apps/${process.e
 
 let app = express();
 
-if(process.env.USE_IAP !== "false") {
+if (process.env.USE_IAP !== "false") {
   app.use(checkIap);
 }
 
@@ -49,6 +49,9 @@ app.get("/data/*", async (req, resp) => {
     } else if (path.endsWith(".geojson.gz")) {
       resp.type("application/geo+json");
       resp.append("Content-Encoding", "gzip");
+    } else if (path.endsWith(".bin.gz")) {
+      resp.type("application/octet-stream");
+      resp.append("Content-Encoding", "gzip");
     }
 
     // Return the whole file?