Transfer-Encoding chunked when Content-Length is given.

[euzu]

actix-web = "4.9"
actix-server = "2.5"

I have a strange problem.

When i print the headers directly before returning the headers, they contain Content-Length: xxxxx.
But on the client side Content-Length disappears, instead i get Transfer-Encoding: chunked

Actix_Web handler response

HeaderMap { inner: {
  "connection": Value { inner: ["keep-alive"] }, 
  "content-length": Value { inner: ["4694430648"] }, 
  "content-range": Value { inner: ["bytes 0-4694430647/4694430648"] }, 
  "date": Value { inner: ["Fri, 24 Jan 2025 14:38:32 +0000"] }, 
  "content-type": Value { inner: ["video/x-matroska"] }, 
  "accept-ranges": Value { inner: ["0-4694430648"] }, 
  "access-control-allow-origin": Value { inner: ["*"] }} }

Client get request response

HTTP/1.1 200 OK
transfer-encoding: chunked
date: Fri, 24 Jan 2025 14:33:53 +0000
vary: Origin, Access-Control-Request-Method, Access-Control-Request-Headers
accept-ranges: 0-4694430648
content-range: bytes 0-4694430647/4694430648
content-type: video/x-matroska
access-control-allow-credentials: true
access-control-allow-origin: *

Why did Conten-Length disappear ? And why did i get transfer-encoding: chunked