Fix ssg race condition (#3521)

* Fix server crash logging and opening fullstack apps

* Fix race condition during SSG

* move route prerendering into a separate stage

* Fix static site generation with dx serve

* only proxy the fullstack server if ssg is disabled

* test nested-suspense with ssg in playwright

packages/cli/src/serve/server.rs

@@ -383,18 +383,18 @@ fn build_devserver_router(
         // For fullstack, liveview, and server, forward all requests to the inner server
         let address = fullstack_address.unwrap();
         router = router.nest_service("/",super::proxy::proxy_to(
-                format!("http://{address}").parse().unwrap(),
-                true,
-                |error| {
-                    Response::builder()
-                        .status(StatusCode::INTERNAL_SERVER_ERROR)
-                        .body(Body::from(format!(
-                            "Backend connection failed. The backend is likely still starting up. Please try again in a few seconds. Error: {:#?}",
-                            error
-                        )))
-                        .unwrap()
-                },
-            ));
+            format!("http://{address}").parse().unwrap(),
+            true,
+            |error| {
+                Response::builder()
+                    .status(StatusCode::INTERNAL_SERVER_ERROR)
+                    .body(Body::from(format!(
+                        "Backend connection failed. The backend is likely still starting up. Please try again in a few seconds. Error: {:#?}",
+                        error
+                    )))
+                    .unwrap()
+            },
+        ));
     } else {
         // Otherwise, just serve the dir ourselves
         // Route file service to output the .wasm and assets if this is a web build