iis

IIS server configuration and hosting

Web Fix CORS Preflight OPTIONS Failures in ASP.NET Web API 2 OWIN

Resolve CORS preflight (OPTIONS) failures in ASP.NET Web API 2 on IIS with OWIN OAuth/JWT auth. Fix duplicate pipelines, middleware order, IIS handlers, and OPTIONS blocks for Angular frontend.

#cors
#asp-net
#web-api
#owin
#iis

1 answer• 1 view

01/06/2026, 04:47 PM