Develop Reference

Flutter API Post Method Can not Send Data to SQL server localhost. Show Error "HTTP Error 400. The request hostname is invalid"

This is My Flutter Code--
void send() async
{
var bb=json.encode(listModel.toJson());
var response = await http.post(Uri.parse(
"http://10.0.2.2:1066/api/Storedata/Add"),
body: bb,
headers: {"Content-type": "application/json"},);
if (response.statusCode == 201)
{
print("Done");
}
else
{
print(response.body);
print(response.statusCode);
}
}
In "bb" variable all data show in json format when i debugged. but show this error "HTTP Error 400. The request hostname is invalid". Please Help!!!!

How to send Binary encrypted data in flutter POST with request encoding :null ? ; which is working in node js properly

According to node.js Documentation encoding : null when binary data to be sent via Api,
https://www.npmjs.com/package/request in this link below mentioned explanation is found.
encoding - encoding to be used on setEncoding of response data. If
null, the body is returned as a Buffer. Anything else (including the
default value of undefined) will be passed as the encoding parameter
to toString() (meaning this is effectively utf8 by default).
Note: if you expect binary data, you should set encoding: null.
Now I have achieve the same thing in flutter/dart and this encoding parameter is not accepting null as here in node.js they have mentioned.
I want to know how to make this same Post request from Flutter/dart or at least android/java.
var enc = AESCrypt.encrypt(key, iv, JSON.stringify(obj_j));
var output = new Buffer.from(enc, 'hex'); // Buffer
function test() {
console.time("XXX");
request.post({
headers: {
'content-type': 'application/json'
}, //required, or webserver will ignore it application/json multipart/form-data
url: 'http://192.168.29.210/deviceid/read', // webserver url
encoding:null,
body: output
},
function (error, response, body) {
if (!error && response.statusCode == 200) {
console.timeEnd("XXX");
body = AESCrypt.decrypt(key, iv, body);
//body is decrypted http response, can be parsed with json method
fs.writeFile('input.json', body, function (err) {
if (err) {
return console.error(err);
}
});
}
});
};
Adding code the What i have tried in flutter
var headers = {'Content-Type': 'application/json'};
var request =
http.Request('POST', Uri.parse('http://192.168.29.210/deviceid/read'));
request.body = encryptedText;
request.encoding = null ; // here this null parameter is not acceptable
request.encoding = Encoding.getByName("utf-8")); // only this option is available to add in flutter
request.headers.addAll(headers);
http.StreamedResponse response = await request.send();
Even in post man this encoding variable is not present to set it.

Use below flutter framework method
Future<Response> post(Uri url,
{Map<String, String>? headers, Object? body, Encoding? encoding}) =>
_withClient((client) =>
client.post(url, headers: headers, body: body, encoding: encoding));
How to use
final url = Uri.parse('$urlPrefix/posts');
final headers = {"Content-type": "application/json"};
final json = '{"title": "Hello", "body": "body text", "userId": 1}';
final response = await post(url, headers: headers, body: json,encoding:null); //here this null parameter is not acceptable

My Final working code is
var headers = {'Content-Type': 'application/json'};
final response = await http.post(
Uri.parse('http://192.168.29.210/deviceid/read'),
headers: headers,
body: encryptedText,
encoding: null);
if (response.statusCode == 200) {
String res = response.body.toString();
//String data = AesEncryption().decryption(res);
print('Body: ${response.body.toString()}');
} else {
print(response.reasonPhrase);
}
print('Status code: ${response.statusCode}');

flutter - no json is sent in the body of my http post

this is the code.
Future<http.Response> postRequest () async {
var url ='http://10.0.2.2:3000/api/message';
Map data = {
'message': '12345678901234567890'
};
//encode Map to JSON
var body = json.encode(data);
var response = await http.post(url,
headers: { "accept": "application/json", "content-type": "application/json" },
body: body
);
print("${response.statusCode}");
print("${response.body}");
return response;
}
postRequest();
// also tried this: headers: {"content-type":"application/json" },
In my python flask server, the post message is logging, but with empty body into it.
The flutter app is running on Android Virtual Device and the server is still running on http://0:0:0:0:3000/ and it's using request.get_json() in the method.
Using postman, everything works as expected on my server so I see the problem in the app.
postman details:
POST: http://localhost:3000/api/message
headers
KEY | VALUE
Content-Type | application/json
Body raw
{
"message": "opa"
}
also raised here: https://github.com/flutter/flutter/issues/39351

Try passing :
Future<http.Response> postRequest () async {
var url ='http://10.0.2.2:3000/api/message';
Map<String, String> data = { "message": "opa" };
var body = json.encode(data);
var response = await http.post(url,
headers: { "accept": "application/json", "content-type": "application/json" },
body: body
);
print(response.statusCode);
print(response.body);
return response;
}
postRequest().then((response){
print(response.body);
});

not sure if my finding is precious or not for community, but it seems that the URL was the problem. Everything works now, but I added a / in the end of the string in my flask app.
In Postman, I didn't have to do this. So if you have same problem, take care :)
The log from Flask server:
127.0.0.1 - - [30/Aug/2019 17:41:32] "POST /api/message/ HTTP/1.1" 200 -
opa
My Flask url is:
#app.route('/api/message/', methods=['POST'])
def function():

How to translate my Android code to Swift code for my Firebase function?

From my research, there isn't much help translating Android code to Swift code. With some help, we were able to translate or convert some of the code but it's not quite finished. When I run the code, I get an error:
Response could not be serialized, input data was nil or zero length.
responseSerializationFailed(reason: Alamofire.AFError.ResponseSerializationFailureReason.inputDataNilOrZeroLength)
Android code needing converting to Swift code:
public static final MediaType MEDIA_TYPE = MediaType.parse("application/json");
ProgressDialog progress;
private void payoutRequest() {
progress = new ProgressDialog(this);
progress.setTitle("Processing your payout ...");
progress.setMessage("Please Wait .....");
progress.setCancelable(false);
progress.show();
// HTTP Request ....
final OkHttpClient client = new OkHttpClient();
// in json - we need variables for the hardcoded uid and Email
JSONObject postData = new JSONObject();
try {
postData.put("uid", FirebaseAuth.getInstance().getCurrentUser().getUid());
postData.put("email", mPayoutEmail.getText().toString());
} catch (JSONException e) {
e.printStackTrace();
}
// Request body ...
RequestBody body = RequestBody.create(MEDIA_TYPE, postData.toString());
// Build Request ...
final Request request = new Request.Builder()
.url("https://us-central1-myapp.cloudfunctions.net/payout")
.post(body)
.addHeader("Content-Type", "application/json")
.addHeader("cache-control", "no-cache")
.addHeader("Authorization", "Your Token")
.build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(Call call, IOException e) {
// something went wrong right off the bat
progress.dismiss();
}
#Override
public void onResponse(Call call, Response response) throws IOException {
// response successful ....
// refers to response.status('200') or ('500')
int responseCode = response.code();
if (response.isSuccessful()) {
switch(responseCode) {
case 200:
Snackbar.make(findViewById(R.id.layout),
"Payout Successful!", Snackbar.LENGTH_LONG)
.show();
break;
case 500:
Snackbar.make(findViewById(R.id.layout),
"Error: no payout available", Snackbar
.LENGTH_LONG).show();
break;
default:
Snackbar.make(findViewById(R.id.layout),
"Error: couldn't complete the transaction",
Snackbar.LENGTH_LONG).show();
break;
}
} else {
Snackbar.make(findViewById(R.id.layout),
"Error: couldn't complete the transaction",
Snackbar.LENGTH_LONG).show();
}
progress.dismiss();
}
});
}
Swift code used from the above Android code:
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"Content-Type": "application/json",
"cache-control": "Your Token"]
Alamofire.request(url, method: .get, headers: headers).validate().responseJSON { (response) in
switch response.result {
case .success(let value):
// you fall here once you get 200 success code, because you use .validate() when you make call.
print(value)
// parse your JSON here.
let parameters : [String: Any] =
["uid": FIRAuth.auth()!.currentUser!.uid,
"email": self.paypalEmailText.text!]
let postData = try! JSONSerialization.data(withJSONObject: parameters, options: [])
case .failure(let error):
if response.response?.statusCode == 500 {
print("Error no payout available")
print(error.localizedDescription)
} else {
print("Error: couldn't complete the transaction")
print(error.localizedDescription)
}
}
}
How can I convert the Android code into the Swift code or discover what it is I am doing wrong? This code is used to post to the function I have created for Firebase.
Edit
With the help of supplied code in this post, I was able to come up with this code but it is still coming up with the same error:
===========Error===========
Error Code: 4
Error Messsage: Response could not be serialized, input data was nil or zero length.
response FAILURE: responseSerializationFailed(reason: Alamofire.AFError.ResponseSerializationFailureReason.inputDataNilOrZeroLength)
updated swift code
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"Content-Type": "application/json",
"cache-control": "Your Token"]
let params : [String: Any] = [
"uid": FIRAuth.auth()!.currentUser!.uid,
"email": self.paypalEmailText.text!]
Alamofire.request(url, method: .post, parameters: params, encoding: JSONEncoding.default, headers: headers).validate().responseJSON { (response) in
switch response.result {
case .success(let JSON):
print("Success with JSON: \(JSON)")
if (response.result.value as? [String:AnyObject]) != nil {
// Access your response here
print(response.result.value!)
}
break
case .failure(let error):
if response.response?.statusCode == 500 {
print("Error no payout available")
print(print("Request failed with error: \(error.localizedDescription)"))
} else {
print("Error: couldn't complete the transaction")
print("\n\n===========Error===========")
print("Error Code: \(error._code)")
print("Error Messsage: \(error.localizedDescription)")
}
}
print("response \(response)")
}
EDIT #2
I edited my method:
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"cache-control": "no-cache",
"Authorization": "Your Token",
"Content-Type": "application/json"]
let parameters : [String: Any] = [
"uid": uid,
"email": self.paypalEmailText.text!
]
Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default, headers: headers).validate(statusCode: 200..<600).responseJSON { (response) in
print("Request: \(String(describing: response.request))") // original url request
print("Result: \(response.result)") // response serialization result
if response.response?.statusCode == 200 {
print("Success with JSON: \(String(describing: response.result.value))")
} else {
let error = (response.result.value as? [[String : AnyObject]])
print(error as Any)
}
print("response \(response)")
}
The response and print outs are:
Request: Optional(https://us-central1-myapp.cloudfunctions.net/payout)
Result: FAILURE
Success with JSON: nil
response FAILURE: responseSerializationFailed(reason: Alamofire.AFError.ResponseSerializationFailureReason.inputDataNilOrZeroLength)
Keep in mind, in my url, my app is not called "myapp" it is just there for protection.

I think there are two issues in the code:
In the Android code, you are setting the parameters uid and email in the request body, whereas in the Swift code, you are setting these parameters in the response body, which is wrong (because by the time you got the response, the request is already completed without the params).
If you want to set a body for the request, the HTTP method (the second parameter to Alamofire.request should be post instead of get.
What you need to do is set the parameters in the request body and set the HTTP method as post, as follows:
let parameters: [String: Any] =
["uid": FIRAuth.auth()!.currentUser!.uid,
"email": self.paypalEmailText.text!]
Alamofire.request(url, method:.post, parameters:parameters,
encoding: JSONEncoding.default, headers:headers)
Try it out and see if it works.

So I'd do it like this here:
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"Content-Type": "application/json",
"cache-control": "Your Token"
]
Alamofire.request(url,
method: .get,
encoding: JSONEncoding.default,
headers: headers).responseJSON
{ response in
switch response.result {
case .success(let JSON):
print("Success with JSON: \(JSON)")
// parse your JSON here something like
if let json = response.result.value as? [String:AnyObject] {
// Access your response here
}
break
case .failure(let error):
print("Request failed with error: \(error)")
}
}
In the success part you should be able to access the JSON and are able to parse it. Can you comment how your reponse object looks like, then I'll comment how you parse it and access the correct elements. I can otherwise only guess.

taking java http request for firebase function and putting in swift

I have researched this online but nothing seems like the code I have.
I am trying to work with firebase functions with both my android and iOS apps. I followed a tutorial and it worked fine in Android because it was done in Android but I want to do the same in iOS.
I was told that Alamofire, comparable to OkHttp in Android, was the way to go but I am not sure how to take the code I have in android and put it in SWIFT code so that It does the same thing.
Any assistance would be greatly appreciated.
Code that was used in Android
public static final MediaType MEDIA_TYPE = MediaType.parse("application/json");
ProgressDialog progress;
private void payoutRequest() {
progress = new ProgressDialog(this);
progress.setTitle("Processing your payout ...");
progress.setMessage("Please Wait .....");
progress.setCancelable(false);
progress.show();
// HTTP Request ....
final OkHttpClient client = new OkHttpClient();
// in json - we need variables for the hardcoded uid and Email
JSONObject postData = new JSONObject();
try {
postData.put("uid", FirebaseAuth.getInstance().getCurrentUser().getUid());
postData.put("email", mPayoutEmail.getText().toString());
} catch (JSONException e) {
e.printStackTrace();
}
// Request body ...
RequestBody body = RequestBody.create(MEDIA_TYPE, postData.toString());
// Build Request ...
final Request request = new Request.Builder()
.url("https://us-central1-myapp.cloudfunctions.net/payout")
.post(body)
.addHeader("Content-Type", "application/json")
.addHeader("cache-control", "no-cache")
.addHeader("Authorization", "Your Token")
.build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(Call call, IOException e) {
// something went wrong right off the bat
progress.dismiss();
}
#Override
public void onResponse(Call call, Response response) throws IOException {
// response successful ....
// refers to response.status('200') or ('500')
int responseCode = response.code();
if (response.isSuccessful()) {
switch(responseCode) {
case 200:
Snackbar.make(findViewById(R.id.layout),
"Payout Successful!", Snackbar.LENGTH_LONG)
.show();
break;
case 500:
Snackbar.make(findViewById(R.id.layout),
"Error: no payout available", Snackbar
.LENGTH_LONG).show();
break;
default:
Snackbar.make(findViewById(R.id.layout),
"Error: couldn't complete the transaction",
Snackbar.LENGTH_LONG).show();
break;
}
} else {
Snackbar.make(findViewById(R.id.layout),
"Error: couldn't complete the transaction",
Snackbar.LENGTH_LONG).show();
}
progress.dismiss();
}
});
}
EDIT - Conversion
This is what I was able to convert to along with the code submitted by #emrepun:
// HTTP Request .... (firebase functions)
MEDIA_TYPE.setValue("application/jston", forHTTPHeaderField: "Content-Type")
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"Content-Type": "application/json",
"cache-control": "Your Token"]
Alamofire.request(url, method: .get, headers: headers).validate().responseJSON { (response) in
switch response.result {
case .success(let value):
// you fall here once you get 200 success code, because you use .validate() when you make call.
print(value)
// parse your JSON here.
let parameters : [String: Any] =
["uid": FIRAuth.auth()!.currentUser!.uid,
"email": self.paypalEmailText.text!]
let postData = try! JSONSerialization.data(withJSONObject: parameters, options: [])
case .failure(let error):
if response.response?.statusCode == 500 {
print("Error no payout available")
print(error.localizedDescription)
} else {
print("Error: couldn't complete the transaction")
print(error.localizedDescription)
}
}
}

You can make a network request similar to your Java version with Alamofire as given below. You should also learn about how to parse JSON with swift. You might want to look at Codable, which makes it easy to parse JSON. Or you can try a framework called "SwiftyJSON", which is handy to handle json requests as well.
let url = "https://us-central1-myapp.cloudfunctions.net/payout"
let headers: HTTPHeaders = [
"Content-Type": "application/json",
"cache-control": "Your Token"
]
Alamofire.request(url, method: .get, headers: headers).validate().responseJSON { (response) in
switch response.result {
case .success(let value):
// you fall here once you get 200 success code, because you use .validate() when you make call.
print(value) // parse your JSON here.
case .failure(let error):
if response.response?.statusCode == 500 {
print("Error no payout available")
print(error.localizedDescription)
} else {
print("Error: couldn't complete the transaction")
print(error.localizedDescription)
}
}
}