获取HTTP返回的头部信息

Use the headers field of the Response object to get a headers Map. The map keys are the header fields, and the map values are the values those fields.

 import 'package:http/http.dart' as http;

main() async {
  var url = 'http://httpbin.org/';
  var response = await http.get(url);

  // Get the headers map.
  print(response.headers.keys);

  // Get header values.
  print(
      "access-control-allow-origin' = ${response.headers['access-control-allow-origin']}");
  print("content-type = ${response.headers['content-type']}");
  print("date = ${response.headers['date']}");
  print("content-length = ${response.headers['content-length']}");
  print("connection = ${response.headers['connection']}");
} 

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