How to get RAW HTTP request headers in Lua script

[alapati96]

I am trying to add WAF as sidecar to envoy gateway, I was able to do this using EnvoyPatchPolicy using lua script, for my use case I need to get the raw http request headers, how can I get the same ?

[zirain]

function envoy_on_request(request_handle)
  -- Make an HTTP call to an upstream host with the following headers, body, and timeout.
  val = request_handle:headers():get("<xxxxx>")
  request_handle:logWarn("get result: " .. val)
end

[alapati96]

If I do this, I will be getting the request headers which envoy is adding/modifying.
As an example, In case of HTTP/1.1 request, host header is being converted to :authority, but I wanted the actual header name as host, how can I do that. Is there any API to get the raw request headers

[zirain]

AFAIK no, but you'd ask in envoy's github/slack.

[alapati96]

Thank you for the response :)