How to get http POST/GET request custom header

[linuxkungfu]

Hi,
I want get head of http request in server side, I only found get standard http header whit lws_hdr_copy function. How can I get custom header.
lws version:v4.4

[laoshanxi]

https://github.com/laoshanxi/app-mesh/blob/main/src/common/lwsservice/WebSocketService.cpp#L124C10-L124C20