HEC with PUT request

[nsmylie]

I am trying to setup my Kemp load balancer to send WAF logs using json format.  I configured the HEC token, enabled it to use the query string format for example:

http://X.X.X.X:8088/services/collector/event?token=XXXX

I see the request go out, it is a PUT command.

Splunk server is rejecting it because it only allows:

Allow: POST,OPTIONS

If this is configurable, I am all ears, thank you!