perf(app-proxy): skip disk reads for absent static prefixes (#3115)

fluxer_app_proxy/src/routes/health.rs

@@ -77,6 +77,7 @@ mod tests {
                 client_ip_header_name: "x-forwarded-for".to_owned(),
             })),
             index_html: None,
+            local_asset_prefixes: None,
             budgets: crate::state::AppProxyBudgets::default(),
         }
     }