I am trying to send a file to an API with Flutter and the http library.
From a file selector, I get the bytes of the file (a pdf) and create a MultipartRequest as follows:
var request = http.MultipartRequest('PUT', Uri.parse('https://xxx/files'))
..fields['grade'] = 'xxx'
..fields['candidate'] = 'xxx'
..files.add(http.MultipartFile.fromBytes(
'document', file.bytes!, contentType: MediaType('application', 'pdf')));
var response = await request.send();
The request failed, it seems that no binary content is added to this request.
In debug mode I can see that the _stream attribute of the file is null (I am sure that file.bytes contains the file) :
content of the debugging
What did I miss?
I found the problem. Without the optional FileName parameter of the fromBytes method the request is not correctly created. You just need to specify a file name for it to work.
Related
I am trying to send multiple images to the backend server.
I have tried Dio and Http but the server responds with an error and the rest of the data except the images get saved.
The documentation says that the key values must be 'images_0' 'images_1' and so on.
Code -
The images are converted from XFile to multipart file.
int imgNum = 0;
for (int i = 0; i < data.images.length; i++) {
if (data.images[i] != null) {
File file = File(data.images[i]!.path);
String fileName = file.path.split('/').last;
http.MultipartFile mFile = http.MultipartFile(
'images_$imgNum',
file.readAsBytes().asStream(),
await file.length(),
filename: fileName,
);
imgNum++;
request.files.add(mFile);
}
}
(data.images is a list of XFiles? , request is the http.MultipartRequest)
All the other fields and headers are working and being saved correctly.
I have tried using Dio too which gives the same response. The response from the server is :
{data: {error: Cannot read property '0' of undefined}, message: Something went wrong. Please try again later.}
Our project also has a website where the form is working correctly, and when the http request there shows the images as follows : (in Google Chrome)
Under form data
Form Data source
The api team has also shared Swagger Ui API docs-
Docs
What am I doing wrong? How can I fix this?
Thank you for responding.
Am getting the response of a request like this:
var response = command.PostCommand(testCommand);
I will like to validate that the response is in a json format so am doing it like this:
Assert.AreEqual("application/json", response.ContentType);
Is this way correctly or do i need to specifically validate it from the content-type header response?
You can use the IRestRequest.OnBeforeDeserialization callback to check the response content type before it gets deserialised:
var request = new RestRequest(url)
.AddQueryParameter(x, y); // whatever you need to configure
request.OnBeforeDeserialization =
response => CheckContentType(response.ContentType);
await client.PostAsync<MyResponse>(request);
I am a bit new to Flutter, and I am building a screen that posts data to an API built in PHP mon my hosting server. The API is built by me which receives a JSON object and then saves the data.
The app is working fine, and API is receiving the data, but the http.post seems is firing twice ( calling the API twice)
Which makes my API saves the record twice. there is no possible way for me to check before adding the send record. as My API simply saves a new record so whenever it receives a call it simply saves it and returns back a value for the mobile App ( built in Flutter).
If I use a condition to check, this way the first call will return correct data to the mobile app, but the second one will return an error for the mobile app since the record already exists.
I have read about the Access-Control-Allow-Origin and how it might be the issue and put it my my .httaccess file
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
but no luck.
any idea.
Note I am using a shared hosting.
Code I use in Flutter:
class _PostADToServerState extends State<PostADToServer> {
Future<List<JSBResponse>> _postRequest() async {
// print('Call API function is called');
Map<String, dynamic> myAd = {
"isbn10": widget.title.isbn10,
"isbn13": widget.title.isbn13,
... [Some fields]
"titleCondition": widget.title.titleCondition,
"priceIs": widget.title.priceIs,
"school_name": widget.title.schoolName
};
String json = jsonEncode(myAd);
var url = 'https://www.example.com/xapis/save_new_ad.php';
var body = json;
var data = await http.post(url,
headers: {
"Content-Type": "application/json",
"accept": "application/json",
"Access-Control-Allow-Origin": "*",
},
body: body);
var jsonData = jsonDecode(data.body);
Code in my PHP API starts with the following:
$data = file_get_contents('php://input');
$theTitle = json_decode($data);
Then I use the content I find in the $theTitle object as the following:
$title = $theTitle->title;
I've been fiddling a POST request that isn't working. What I've found is that the content of the request is empty even though I believe I'm adding it correctly (even though there aren't any docs available that I can find).
var json = JsonConvert.SerializeObject(payload);
var client = new RestClient
{
Authority = "",
Credentials = OAuthCredentials.ForProtectedResource(Registration.ClientKey,
Registration.ClientSecret,
AuthorizationToken.Token,
AuthorizationToken.Secret),
Method = WebMethod.Post,
Path = url
};
var request = new RestRequest();
request.AddHeader("Accept", ContentType);
request.AddHeader("Content-Type", ContentType);
request.AddPostContent(Encoding.UTF8.GetBytes(json));
response = client.Request(request);
I'm not having any trouble with authorization. I just kept getting a 400 error. After capturing the request with Fiddler, I noticed that content-length was 0. What am I missing? Do I need to do something in addition to AddPostContent? When I check the request object right before executing, there is content in PostContent, but it's as if Hammock isn't adding it to the request. I am using the latest full nuget (not ClientProfile).
I am trying to upload a video and encode it via azure rest service.
I have now hit the step of encoding the video but I am having difficulties with the request.
The following code shows my request:
var joburl = res.RequestMessage.RequestUri + "Jobs";
client = new HttpClient();
client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", "Bearer " + token);
client.DefaultRequestHeaders.Add("x-ms-version", "2.8");
client.DefaultRequestHeaders.Add("DataServiceVersion", "3.0");
client.DefaultRequestHeaders.Add("MaxDataServiceVersion", "3.0");
client.DefaultRequestHeaders.Add("x-ms-date", date);
//accept
t = new NameValueHeaderValue("odata", "verbose");
type = new MediaTypeWithQualityHeaderValue("application/json");
type.Parameters.Add(t);
client.DefaultRequestHeaders.Accept.Add(type);
result = await client.PostAsync(joburl,json);
the url:https://wamsamsclus001rest-hs.cloudapp.net/api/Jobs
the json:
{"Name":"khgfiuydencodingjob","InputMediaAssets":[{"__metadata":{"Uri":"https://wamsamsclus001rest-hs.cloudapp.net/api/Assets('nb%3acid%3aUUID%3ad037b321-cd1c-43a9-9607-c4910fa7a85b')"}}],"Tasks":[{"Configuration":"H264 Adaptive Bitrate MP4 Set 720p","MediaProcessorId":"nb:mpid:UUID:1b1da727-93ae-4e46-a8a1-268828765609","TaskBody":"<?xml version=\"1.0\"encoding=\"utf-8\"?><taskBody><inputAsset>JobInputAsset(0)</inputAsset><outputAsset>JobOutputAsset(0)</outputAsset></taskBody>"}]}
The bearer token works as I use it for other request.
But I get a bad request 400 with the followin error message:
{"error":{"code":"","message":{"lang":"en-US","value":"Parsing request content failed due to: Make sure to only use property names that are defined by the type"}}}
Can anyone spot the error.
Thank you for the help
Okay I got it to work. Needed a odata=verbose in my json/string content - like this:
var jobInJson = JsonConvert.SerializeObject(job);
json = new StringContent(jobInJson, Encoding.UTF8);//,
json.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json;odata=verbose");
I tried this earlier however I got a error 500 but now it is working.