Pass preflight request to upstream. Fixes gh-2472

[tommas1988]

Pass preflight request to upstream. Fixes issue 2472

[spencergibb]

Sorry for the late reply. This needs to be opt-in since it is a change from the default behavior. Are you able to make that change?

[tommas1988]

Are you able to make that chang

Sorry for the late reply. This needs to be opt-in since it is a change from the default behavior. Are you able to make that change?

Sorry I don`t get the meaning of 'opt-in'. What can I do with this PR ?

[spencergibb]

It needs to be activated by a property. Other people rely on the current behavior. Those that want this new behavior need to opt in by setting a property. I'm asking if you can add that to the PR

[tommas1988]

It needs to be activated by a property. Other people rely on the current behavior. Those that want this new behavior need to opt in by setting a property. I'm asking if you can add that to the PR

There is a boolean setting item named handle-preflight-request in route setting to control this behavior. And it is disabled by default.

[tommas1988]

I will add some docs for this feature some time later

[tommas1988]

After recalling the related bug and code review, I'm going to refactor the codes. It seems useless to implement PreFlightRequestFilter interface on every GatewayFilters

[tommas1988]

PreFlightRequestFilter interface is still needed to allow only filters that affect route process to handle preflight request.