When I use flutter http library with headers authorization token, its shows 500, in console. but in postman all okay - flutter

Here is my code, I also tried using retrofit but I failed and it shows 500 and "message": "Undefined index: token". but in postman, it shows 200. how can it be possible?
Also tried
'Content-Type': 'application/json',
'Accept': 'application/json',
'Authorization': 'Bearer $token',
Future getCertificateList() async {
final url = Uri.parse(
'https://portal-api.jomakhata.com/api/getCertificateList');
final response = await http.get(url,
headers: {
'Authorization': 'Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjI4OTksImlzcyI6Imh0dHBzOi8vcG9ydGFsLWFwaS5qb21ha2hhdGEuY29tL2FwaS9hdXRoL2xvZ2luIiwiaWF0IjoxNjI4NjE0MDcyLCJleHAiOjE2Mjg3MDA0NzIsIm5iZiI6MTYyODYxNDA3MiwianRpIjoiRnRjaGllbTFFdVlsYXZidyJ9.O24U0XGFiZdfXRGUP5xYD82-LisSbMsCtVZnuG6iTiY',
},
);
print(response.statusCode);
print(response.body);
return response.body;
}
In my console it's print 500
this is postman request image


try this code:
Future getCertificateList() async {
final uri = Uri.https('https://portal-api.jomakhata.com','/api/getCertificateList');
final response = await http.get(uri, headers: {
HttpHeaders.authorizationHeader:
'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjI4OTksImlzcyI6Imh0dHBzOi8vcG9ydGFsLWFwaS5qb21ha2hhdGEuY29tL2FwaS9hdXRoL2xvZ2luIiwiaWF0IjoxNjI4NjE0MDcyLCJleHAiOjE2Mjg3MDA0NzIsIm5iZiI6MTYyODYxNDA3MiwianRpIjoiRnRjaGllbTFFdVlsYXZidyJ9.O24U0XGFiZdfXRGUP5xYD82-LisSbMsCtVZnuG6iTiYv',
HttpHeaders.contentTypeHeader: 'application/json',
});
print(response.statusCode);
print(response.body);
return response.body;
}

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Add it as this
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According to #anirudh comment I have enabled CROS in my web Api and problem have changed . Now the response is : 204 No Content

use http plugin
And do http.get and not just get
import 'package:http/http.dart' as http;
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First defining a variable :
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Then write these codes in my api in ConfigureServices :
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.AllowAnyHeader()
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});
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app.UseCors(MyAllowSpecificOrigins);

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