NiFi websocket subprotocols support

[#1]

Hello,

For a project, I need to configure a WebSocket connection using NiFi. I also need to define a custom sub-protocol in the “Sec-WebSocket-Protocol” header.

I have seen that some custom headers can be defined in the parent FF with the “header.Something” attribute. In fact, all headers are defined except for the sub-protocol. How can I achieve this without having to develop my own processor?

My GenerateFlowFile has the following attributes: `header.Sec-WebSocket-Protocol = Test` and another `header.Test = Test2`.

The request retrieved by Wireshark only uses header.Test. Is it normal ?
Thanks.

(related to https://community.cloudera.com/t5/Support-Questions/Nifi-websocket-subprotocols/m-p/311764#M224816 and https://community.cloudera.com/t5/Support-Questions/NiFi-WebSocket-Headers/m-p/361488)

[#2]

@Tituya Welcome to the Cloudera Community!

To help you get the best possible solution, I have tagged our NiFi experts @MattWho @mburgess  who may be able to assist you further.

Please keep us updated on your post, and we hope you find a satisfactory solution to your query.