Undertow as server supports all http methods.
It is up to handlers in handler chain that might choose not to support some methods.
I would look into your handler chain configuration to see which one is not handling PATCH properly.

--
tomaz

On Sun, Oct 2, 2016 at 9:50 PM, Steve Hu <stevehu@gmail.com> wrote:
I am building a REST API framework on top of undertow core to support design driven implementation from Open API (Swagger) specifications for security and validation during runtime. From swagger-codegen result, I found that undertow doesn't support http method PATCH. Is there a reason it is not supported? or any workaround? Thanks. 

https://github.com/networknt/undertow-server


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