Blog
WinterJS and WebAssembly runtimes: fetch compatibility, CORS in edge environments, and Workers API parity
Wasm-first runtimes aim for web-standard fetch—CORS still applies when browsers call your edge deployment.
1 min read
winterjsedgecors
Cold start
Wasm instantiation can delay first byte—do not confuse slow OPTIONS with CORS denial.
Module linking errors may return 500 without CORS headers—fix error middleware to append CORS on failures.
Interop
FFI to native code must not bypass origin checks for HTTP responses returned to browsers.