CORS for Azure Functions: Options, Tradeoffs, and Pitfalls
CORS on Azure Functions looks simple until you ship something with auth, multiple environments, and a frontend team that keeps changing origins every sprint. I’ve seen teams treat CORS as a checkbox in the Azure Portal, then spend hours debugging why Authorization headers fail, why local dev works but production doesn’t, or why preflight requests get blocked before their function code even runs. If you’re building browser-facing APIs on Azure Functions, you have a few ways to handle CORS. Some are easy. Some are flexible. Some are traps. ...