1. kubectl exec YOUR_NGINX_INGRESS_CONTROLLER_POD -it -- cat
/etc/nginx/template/nginx.tmpl > nginx.tmpl
2. Open nginx.tmpl, add below code block after location {{ $path }} {
header_filter_by_lua_block {
local h = ngx.req.get_headers()
local request_headers_all = ""
for k, v in pairs(h)
