This commit fixes two issues with the frontend API 1. fix: update cors max age to match chromium defaults https://source.chromium.org/chromium/chromium/src/+/main:services/network/public/cpp/cors/preflight_result.cc;drc=49e7c0b4886cac1f3d09dc046bd528c9c811a0fa;l=31 2: fix: expose ETage for cross-origin requests