I'm making an app that grabs cryptocurrency JSON data from the public v1 Api but support for this will soon be dropped, meaning that I'll have to migrate the the more powerful professional v1 Api.
The only issue is, I don't know how to implement the use of the new Api key thats required as I parse the JSON data.
I'm using a heavily modified version of this git repo to program the app, but all basic functionality is based here.
All I need is guidance on what I need to add to this file to display the new professional v1 Api, any comments or ideas are appreciated. Thanks
This the the crypto_data_prod.dart file where I would have to change my code for use with the key.
import 'dart:async';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:fluttercrypto/data/crypto_data.dart';
class ProdCryptoRepository implements CryptoRepository {
String cryptoUrl = "https://api.coinmarketcap.com/v1/ticker/?limit=50";
#override
Future<List<Crypto>> fetchCurrencies() async {
// TODO: implement fetchCurrencies
http.Response response = await http.get(cryptoUrl);
final List responseBody = JSON.decode(response.body);
final statusCode = response.statusCode;
if (statusCode != 200 || responseBody == null) {
throw new FetchDataException(
"An error ocurred : [Status Code : $statusCode]");
}
return responseBody.map((c) => new Crypto.fromMap(c)).toList();
}
}
Try to change http.Response response = await http.get(cryptoUrl); to
http.Response response = await http.get(cryptoUrl,
headers: {"X-CMC_PRO_API_KEY": "cab79c7b-52e9-4e4b-94fc-b0f32da14799"});
For more info check this link.
Related
I was practicing this covid-19 tracker application using flutter from a tutorial on YouTube, so after writing a few code when I hit the API and run the application, it throws this exception, I don't understand why as I am a beginner and a newbie on Flutter.
import 'dart:convert';
import 'package:covid_tracker/Model/world_states_model.dart';
import 'package:http/http.dart' as http;
import 'Utilities/app_url.dart';
class StatesServices {
// async means waiting for your request
Future<WorldStatesModel> fetchWorldStatesRecords() async {
final response = await http.get(Uri.parse(AppUrl.worldStatesApi));
if (response.statusCode == 200) {
var data = jsonDecode(response.body);
return WorldStatesModel.fromJson(data);
} else {
throw Exception('Error');
}
}
}
class AppUrl {
// this is our base url
static const String baseUrl = 'https://disease.sh/v3/covid-19';
// fetch world covid states
static const String worldStatesApi = '${baseUrl}all';
static const String countriesList = '${baseUrl}countries';
}
You are getting a status code that's not 200. Therefore your application throws an error, just as you have programmed it!
The first step would be to actually figure out why you are getting a different status code from 200. Looking at your code it seems that you try to visit '${baseUrl}all'. This translates to https://disease.sh/v3/covid-19all. This URL however does not exist.
To fix your issue try adding a / after ${baseUrl}. Such that it becomes '${baseUrl}/all'. Or add the change the baseUrl variable to https://disease.sh/v3/covid-19/. After that, your error should be resolved.
I recommend printing to the console what links you are trying to load. It would probably prevent this kind of issue in the future. Or even more useful, include it in the exception you throw. :)
if stataus !=200 from API,
You are throwing exception in this line
throw Exception('Error');
it shows API is not returning the needed data.
Try to change line
static const String baseUrl = 'https://disease.sh/v3/covid-19';
to
static const String baseUrl = 'https://disease.sh/v3/covid-19/';
I am trying to use the wordpress api, but it throws me an error when entering the url.
Error: The argument type "String" can't be assigned to the parameter type Uri
Could someone explain the error to me and tell me how the code should look? Thanks
import 'package:http/http.dart' as http;
import 'dart:convert';
Future<List> blog() async {
final response = await http.get(('https://bauk.blog/wp-json/wp/v2/posts?_embed': {"Accept": "application/json"}));
var convertirajson = jsonDecode(response.body);
return convertirajson;
}
You need to parse the url before passing it to http.get()
For that declare your url variable like this:
var url = Uri.parse('https://bauk.blog/wp-json/wp/v2/posts?_embed');
And then pass it to http.get() like this
http.get((url: {...} ));
I want to send an HTTP GET request with json body using dart. I know this is possible, because I've done it in the past but can't find the files/recode it. Packages like dart:http doesn't allow to send a body along with an GET request.
thanks for help
I am not really sure where the problem should be but I have made this example for Dart VM which I guess does what you want:
import 'dart:convert';
import 'dart:io';
Future<void> main(List arguments) async {
final response =
await getCallWithBody('http://localhost:8080', {"Key": "Value"});
response.forEach(print);
}
Future<List<String>> getCallWithBody(String address, Object object) async {
final client = HttpClient();
final request = await client.getUrl(Uri.parse(address));
request.contentLength = -1;
request.add(utf8.encode(json.encode(object)));
await request.flush();
return (await request.close())
.transform(utf8.decoder)
.transform(const LineSplitter())
.toList();
}
My goal:
I want to make a get request to the RestApi that is running on the device in my local network to retrieve JSON data generated by the device.
What happens
The RestApi correctly responds to the browser call from every other device in the network. Bash's curl also works, however when I try to access the data through dart's http.get the program fails to retrieve the JSON data - I'm getting Statuscode 400.
Browser call result
What I have tried:
Messing with URL to make sure it's written correctly,
Setting up headers {"content" : "application/json"}
Using no (default) headers
Running the API call from separate dart file and from function embedded in flutter app. Both resulted in Statuscode 400, though flutter provided some more bug information:
Unhandled Exception: SocketException: OS Error: No route to host, errno = 113. I believe I have also seen the errno = 111 when I tried something else.
Using lower level HttpClient instead of Http
In the flutter app, I can connect to the data stored on firebase through http.get easily enough, but call to the device in local network results in the scenario described above.
Stand-alone dart file
import 'package:dart_http/dart_http.dart' as dart_http;
import 'package:http/http.dart' as http;
import 'dart:io';
import 'dart:convert';
main(List<String> arguments) async {
var url = 'http://192.168.0.5/api/device/state';
http.Response response1 =
await http.get(url, headers: {"content": "application/json"});
print('Response status: ${response1.statusCode}');
print('Response body: ${response1.body}');
print('Response body: ${response1.headers}');
print('Response body: ${response1.reasonPhrase}');
print('Response body: ${response1.request}');
HttpClient()
.getUrl(Uri.parse(
'http://192.168.0.5/api/device/state/')) // produces a request object
.then((request) => request.close()) // sends the request
.then((response) {
print(response);
response.transform(Utf8Decoder()).listen(print);
}); // transforms and prints the response
}
Call-embedded in flutter project
Future<Map<String, String>> getAirSensorStatus() async {
print("Getting Air Sensor");
http.Response response =
await http.get('http://192.168.0.5/api/device/state');
print(response);
print("Status code " + "${response.statusCode}");
try {
if (response.statusCode != 200 && response.statusCode != 201) {
print("Something went wrong. Status not 200 and not 201 for AirSensor");
return null;
}
final responseData = json.decode(response.body);
return responseData;
} catch (error) {
print(error);
return null;
}
}
I'm expecting to get statuscode 200 and JSON data in the response. Instead, only a response object is created and no connection established.
Could you help me figure out why is that?
The link to the documentation of the API I'm trying to access:
https://technical.blebox.eu/
The issue seems likely to be caused by the client unable to reach the local server on the request. HTTP error 400 is labelled as "Bad request" and "No route to host, errno = 113" usually caused by network error. A common fix to this issue is to ensure that the client is on the same network the local server is hosted in.
I managed to load the data from a Json File which is local on my Flutter Project. I also was able to fetch Data from the Internet, if the API Url was like:
https://[API-Server][parameter1:xy][parameter2:abc][API-KEY:lasgoewrijeowfjsdfdfiia]
I archieved that with this code sample:
Future<String> _loadStringFixtures() async {
return await rootBundle.loadString('assets/fixtures.json');
}
Future loadFixtures() async {
String jsonString = await _loadStringFixtures();
final jsonResponse = json.decode(jsonString);
FixturesAPI value = new FixturesAPI.fromJson(jsonResponse);
return value;
}
So far so good...
But now I am facing a problem with the API Provider RapidAPI
You can find the documentation etc. here:
https://rapidapi.com/api-sports/api/api-football/endpoints
As you can see they give some code snippets to connect to their API.
There are some for C, C#, Java, Python etc. You can look into all of them with the link above.
Sadly there is no example for Flutter.
And I do not see a way to adapt these examples.
Normally you can paste your API Key directly into the URL, but this seems not possible here? Or maybe it is?
Does Flutter also have other possibilities to receive data from an API besides the one I did?
Thank you so much in advance for your help!
It's possible to with http package and very easy. You can see in this example below...
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
class APIService {
// API key
static const _api_key = <YOU-API-KEY-HERE>;
// Base API url
static const String _baseUrl = "api-football-beta.p.rapidapi.com";
// Base headers for Response url
static const Map<String, String> _headers = {
"content-type": "application/json",
"x-rapidapi-host": "api-football-beta.p.rapidapi.com",
"x-rapidapi-key": _api_key,
};
// Base API request to get response
Future<dynamic> get({
#required String endpoint,
#required Map<String, String> query,
}) async {
Uri uri = Uri.https(_baseUrl, endpoint, query);
final response = await http.get(uri, headers: _headers);
if (response.statusCode == 200) {
// If server returns an OK response, parse the JSON.
return json.decode(response.body);
} else {
// If that response was not OK, throw an error.
throw Exception('Failed to load json data');
}
}
}
Then get you request:
//....
APIService apiService = APIService();
// You future
Future future;
//in the initState() or use it how you want...
future = apiService.get(endpoint:'/fixtures', query:{"live": "all"});
//....
Yes it possible in flutter. Use the Dio Package in flutter which is a powerful Http client. Using dio you can set interceptors to add api key to url so you don't have to append it in every request. Setting interceptors will help you.