Question

我在Flutter项目中遇到异常。该错误如下所示：

Exception has occurred.
FormatException (FormatException: Unexpected character (at character 1)
<!DOCTYPE html>
^
)

这显示在“抛出错误”行中。代码如下：

Future<void> _authenticate(
      String email, String password, String urlSegment) async {
    final url =
        "https://identitytoolkit.googleapis.com/v1/accounts:$urlSegment?key=AIzaSyC9Rz9CDv-_hc68I_wdvogF2ZnDHCpr2Y8";
    try {
      final response = await http.post(
        url,
        body: json.encode(
          {
            "email": email,
            "password": password,
            "returnSecureToken": true,
          },
        ),
      );
      print(response.body);
      final responseData = json.decode(response.body);
      if (responseData["error"] != null) {
        throw HttpException(responseData["error"]["message"]);
      }
      _token = responseData["idToken"];
      _userId = responseData["localId"];
      _expiryDate = DateTime.now().add(
        Duration(
          seconds: int.parse(
            responseData["expiresIn"],
          ),
        ),
      );
      _autoLogout();
      notifyListeners();
      final prefs = await SharedPreferences.getInstance();
      final userData = json.encode(
        {
          "token": _token,
          "userId": _userId,
          "expiryDate": _expiryDate.toIso8601String(),
        },
      );
      prefs.setString("userData", userData);
    } catch (error) {
      throw error;           //Exception is showing here
    }
  }

Error message looks like this as shown in the image (Click)

调试控制台显示以下消息：

I/flutter (18432): <!DOCTYPE html>
I/flutter (18432): <html lang=en>
I/flutter (18432):   <meta charset=utf-8>
I/flutter (18432):   <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
I/flutter (18432):   <title>Error 404 (Not Found)!!1</title>
I/flutter (18432):   <style>
I/flutter (18432):     *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/branding/googlelogo/1x/googlelogo_color_150x54dp.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/brand
I/flutter (18432): FormatException: Unexpected character (at character 1)
I/flutter (18432): <!DOCTYPE html>
I/flutter (18432): ^

请帮助

Answer 1

我在 API 响应中呈现 pdf 文本和 html 文本时遇到了同样的问题，我已经使用以下代码解决了这个问题。如需更多信息，请参阅 here。

GROUP BY

注意：您必须输入 var data= await json.decode(json.encode(response.databody); 才能重新关注该问题

Answer 2

似乎您没有得到JSON作为响应，因此在解码时会抛出该异常。试试邮递员中的API，看看响应是否为JSON。

Answer 3

我的端点在http url中错误。我在http url中使用了一些较旧的终结点。

根据Firebase REST Auth文档，我必须将signUp用于注册功能并将signInWithPassword用于登录功能，并将其传递到urlSegment中的_authenticate()

Flutter格式异常：意外字符（在字符1处）

3 个答案: