[Flutter] Why doesn't Flutter Http library return full response headers?

I got very simple Flutter Http post request, it almost works, except, it seems it doesn't return all response headers.

The request code is below:

var apiUrl = '${rootUrl}api/auth/login';
final response=await http.post(
Uri.parse(apiUrl),
headers: <String,String> {
"Content-Type": "application/json; charset=UTF-8",
},
body: jsonEncode({
"userName": userName,
"password": password,
})
);
print(response.headers);


Below is the response header from Chrome, the server definitely returns all the headers, however, flutter http library only prints "Content-Type" header, no more, I want to read some customized header, e.g. "Hello", did some extra setup before sending post?

(The http library I used is https://pub.dev/packages/http, version 1.2.2)



Any ideas? Thanks.

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