CORS preflight (OPTIONS) returns 404 on /api/* — how to add a global preflight handler?

[EvgenyK (Evgeny Karpov)]

Hi,

HttpApi supports OPTIONS request itself so processing of OPTIONS is disabled on http server level.

check more at OpenAPI Specification - Version 2.0 | Swagger

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some ideas for your case:

• create route for OPTIONS and return 204. it can be done via TROHttpApiResult.
• use Using OnCustomResponseEvent in a ROSDK Server snippet. You can handle OPTIONS and pass the rest to standard HttpApi dispatcher. custom processing for HttpApi was already discussed in related threads.
• create descendant of TROHttpApiDispatcher and override Process method