I'd like to download the JSON file which can be accessed by this url https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media. Unfortunately I was not able to download this file with the http get-function. I assume that I have some problem with the parsing since if I remove "?alt=media" it works perfectly, but unfortunately I only get the meta-json file. This is the code which I use:
import 'package:http/http.dart' as http;
[...]
[...]
void testFunction(){
var url_string = "https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media";
var result = await getJsonFromFirebaseRestAPI(url_string);
print(result);
}
Future<String> getJsonFromFirebaseRestAPI(String url) async {
http.Response response = await http.get(Uri.parse(url));
return response.body;
}
The JSON file result should look like this:
routes: []
It's basically empty I'm just trying to implement the function.
I use http: ^0.13.5
I get the following error:
Error: XMLHttpRequest error.
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 299:10
createErrorWithStack
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 341:28
_throw
dart-sdk/lib/core/errors.dart 116:5
throwWithStackTrace
dart-sdk/lib/async/zone.dart 1378:11
callback
dart-sdk/lib/async/schedule_microtask.dart 40:11
_microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5
_startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 166:15
<fn>
Can anybody solve my issue?
Appreciate your time :)
I did few changes on your code and it is working. There was no issue with the get function. here is the updated piece
import 'package:http/http.dart' as http;
// just a normal main to test the function in terminal
void main(List<String> arguments) async {
await testFunction();
}
// changed this to future and made it async
Future<void> testFunction() async {
var url_string = "https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media";
var result = await getJsonFromFirebaseRestAPI(url_string);
print(result);
}
// no changes applied here.
Future<String> getJsonFromFirebaseRestAPI(String url) async {
http.Response response = await http.get(Uri.parse(url));
return response.body;
}
Related
I'd like to download the JSON file which can be accessed by this url https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media. Every time I call the function I get a Error: XMLHttpRequest error. After some researches I found that this error could be avoided by adding my API token in the header. Something like
headers: {
HttpHeaders.authorizationHeader: 'Basic your_api_token_here', //here i want my token
},
But I have no clue how to get my api Token. Does anybody know how to fetch this token? May this error be caused becaus I run it on chrom flutter?
import 'package:http/http.dart' as http;
[...]
[...]
void testFunction(){
var url_string = "https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media";
var result = await getJsonFromFirebaseRestAPI(url_string);
print(result);
}
Future<String> getJsonFromFirebaseRestAPI(String url) async {
http.Response response = await http.get(Uri.parse(url));
return response.body;
}
The JSON file result should look like this:
routes: []
It's basically empty I'm just trying to implement the function.
I use http: ^0.13.5
I get the following error:
Error: XMLHttpRequest error.
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 299:10
createErrorWithStack
dart-sdk/lib/_internal/js_dev_runtime/patch/core_patch.dart 341:28
_throw
dart-sdk/lib/core/errors.dart 116:5
throwWithStackTrace
dart-sdk/lib/async/zone.dart 1378:11
callback
dart-sdk/lib/async/schedule_microtask.dart 40:11
_microtaskLoop
dart-sdk/lib/async/schedule_microtask.dart 49:5
_startMicrotaskLoop
dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 166:15
<fn>
Can anybody solve my issue?
Appreciate your time :)
In my case it works perfectly. You just need to add async to testFunction(). You have no need for JWT.
Examples:
void testFunction() async{
var url_string = "https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media";
var result = await getJsonFromFirebaseRestAPI(url_string);
print(result);
}
Future<String> getJsonFromFirebaseRestAPI(String url) async {
http.Response response = await http.get(Uri.parse(url));
return response.body;
}
or
try{
final response = await Dio().get( 'https://firebasestorage.googleapis.com/v0/b/prufungssimulation-caff9.appspot.com/o/5qPfjoZjdNXyN5Ob2q3pFbj5MKy1.json?alt=media',
);
print(response.data);
}catch(e){
print(e.toString());
if(e is DioError){
print(e.response!.data);
}
}
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();
}
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.
I am trying to fetch a json array from webservice.
The docs say:
_getIPAddress() {
final url = 'https://httpbin.org/ip';
HttpRequest.request(url).then((value) {
print(json.decode(value.responseText)['origin']);
}).catchError((error) => print(error));
}
If I use this code I get the error:
The method request is not defined for the class 'HttpRequest'
While If I try to import:
import 'dart:html';
I get this error:
Target of URI doesn't exist 'dart:html'
For http requests i recommend the http package.
Then after importing the http package you can use it like that for example:
import 'package:http/http.dart' as http;
_getIPAddress() async {
final url = 'https://httpbin.org/ip';
try {
http.Response res = await http.get(url);
print(json.decode(res.body));
} catch(e) {
print(e);
}
}