how to configure a post request with a query parameter in flutter

Question

I want to make a post request which require a model class and a query parameter.I want to pass a query parameter for the email after I have also passed the model class. I am coming from Java background and in Java, you can just use @Query keyword then pass the name of the key for it. I want to achieve the same thing using flutter. This is how the backend is configured.

PostMapping("/account/create")
    public ResponseEntity<SignUpResponse> createAccount(@RequestBody BankAccountDto bankAccountDto, @RequestParam("email") String email) throws DataNotFoundException, DataNotAcceptableException, DataAlreadyExistException, DataNotFoundException, DataNotAcceptableException, DataAlreadyExistException {
        return bankAccountService.createAccount(bankAccountDto,email);

This is what I tried

static Future<Response?> postData(String endpoint, dynamic body) async {
    var url = Uri.parse(baseUrl + endpoint);
    Map<String, String> header = <String, String>{
      'Authorization': 'Bearer',
      'content-type': 'application/json; charset=UTF-8',
      'Accept': 'application/json'
    };
    try {
      Response response =
          await post(url, body: json.encode(body), headers: header);
      print("The post response returns ${response.body}");
      return response;
    } catch (e) {
      print(e.toString());
      return null;
    }
  }

Answer 1

Try to do this way, it alot cleaner in my opinion

static Future<Response?> postData(String endpoint, dynamic body) async {
    //var url = Uri.parse(baseUrl + endpoint);
    Map<String, String> header = <String, String>{
      'Authorization': 'Bearer',
      'content-type': 'application/json; charset=UTF-8',
      'Accept': 'application/json'
    };
    try {
      final String authority = "exemple.com";
      // Here your api endpoint
      final String path = "/api/account/create";
      final queryParameters = {"email": "your_email_here"};

      final uri = Uri.https(authority, path, queryParameters);

      Response response = await post(uri, body: json.encode(body), headers: header);
      print("The post response returns ${response.body}");
      return response;
    } catch (e) {
      print(e.toString());
      return null;
    }
  }