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Flutter Dio如何自定义拦截异常

应用场景

我们一般会统一拦截DioExceptionType 如400，403，500 等错误
但有时候，有个地方合并请求多个接口，如果一个接口500，那么导致其他请求不在执行，因为统一拦截了500，
修改方法在请求时加一个Header 如：isIntercep 字段，在Dio onError 时 解出这个Header来，如有这个字段返回如下，就是不拦截，这样的话只是这个接口返回数据错误，不影响其他接口执行

 handler.resolve(Response<Map<String, dynamic>>(requestOptions: err.requestOptions,statusCode: 200,data: {},),///请求公共参数拦截器
class HttpParamsInterceptor extends Interceptor {static const language = "language";static const appname = "appname";static const mobileType = "mobileType";static const mobileId = "mobileId";static const version = "version";@overridevoid onRequest(RequestOptions options, RequestInterceptorHandler handler) {var headers = options.headers;headers[language] = LocaleController.getCountryCode;headers[mobileType] = GetPlatform.isAndroid ? "Android" : "IOS";headers[version] = PackageInfoManager().version;headers[appname] = PackageInfoManager().appName;if (AppConfig.instance.enableRequestJsonLog) {Log.r('${"--------------------onRequest---------------"}\n${options.method}${' Url:'} ${options.uri}\n${'Query Parameters:'}${options.queryParameters}\n${'Body:'}${options.data != null ? const JsonEncoder.withIndent('  ').convert(options.data) : ""}\n\n');}super.onRequest(options, handler);}@overridevoid onResponse(Response response, ResponseInterceptorHandler handler) {if (AppConfig.instance.enableResponseJsonLog) {Log.r('${"-----------------------------Response Start-----------------------------"}\n${response.requestOptions.method}${' Url:'} ${response.requestOptions.uri}\n${'Query Parameters:'}${response.requestOptions.queryParameters}\n${'Body:'}${response.requestOptions.data != null ? const JsonEncoder.withIndent('  ').convert(response.requestOptions.data) : ""}\n${'response data:'}\n$response\n\n${"-----------------------------Response End-------------------------------"}\n\n\n');}super.onResponse(response, handler);}@overrideFuture<void> onError(DioException err, ErrorInterceptorHandler handler) async {AppException appException = AppException.create(err);if (AppConfig.instance.enableRequestLog) {Log.e('DioException===: +${err.toString()}');}Log.logPrint(err.requestOptions.headers);Log.logPrint(appException.type);Map<String, dynamic> data = err.requestOptions.headers;bool? isIntercep = data[APIConstant.ignoreIntercep];if (isIntercep == true &&(appException.type == DioExceptionType.badResponse ||appException.type == DioExceptionType.unknown)) {return handler.resolve(Response<Map<String, dynamic>>(requestOptions: err.requestOptions,statusCode: 200,data: {},),);}return handler.next(appException);}
}