i'm setting up a flask server and i would like to do HTTP POST request with a json content-type from android application.
for my purpose i only need to get json data from different client.
one of these client is an android application and it basically do an http post in the server.
the code of android post request is :
public void SendHttp(View view){
new Thread(new Runnable() {
#Override
public void run() {
StringBuffer stringBuffer = new StringBuffer("");
BufferedReader bufferedReader = null;
final String lte_url="http://192.168.1.8:5000/data_center/lte";
HttpPost httpPost = new HttpPost();
try {
HttpClient httpClient = new DefaultHttpClient();
URI uri = new URI("http://192.168.1.8:5000/data_center/lte");
httpPost.addHeader(new BasicHeader(HTTP.CONTENT_TYPE,"application/json"));
httpPost.setURI(uri);
JSONObject send_ = json_lte;
txtSend.setText(""+send_.toString(2));
StringEntity entity = new StringEntity("{"+
"\"date\":"+"\""+send_.getString("Date")+","+
"\"Ping\":"+send_.getString("Ping")+","+
"\"Download\":"+send_.getString("Download")+","+
"\"Upload\":"+send_.getString("Upload")+","+
"\"Latitude\":"+send_.getString("Latitude")+","+
"\"Longitude\":"+send_.getString("Longitude")+","+
"\"Type\":"+send_.getString("Type")+","+
"\"RsRq\":"+send_.getString("RsRq")+","+
"\"RsRp\":"+send_.getString("RsRp")+","+
"\"SINR\":"+send_.getString("SINR")+","+
"\"Bandwidth\":"+send_.getString("Bandwidth")+
"}");
txtSend.setText(entity.toString());
httpPost.setEntity(entity);
HttpResponse httpResponse = httpClient.execute(httpPost);
} catch (some Exeption...)}
}
}).start();
the only output of the flask server is it
Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
192.168.1.237 - - [23/Jul/2019 22:47:58] "POST /data_center/lte HTTP/1.1" 201 -
the code about the server is :
#app.route('/data_center/lte',methods=['POST'])
def post_LTE_data():
try:
data = request.get_json(force=True)
packet = {
'date': data['Date'],
'ping': data['Ping'],
'download': data['Download'],
'upload': data['Upload'],
'latitude': data['Latitude'],
'longitude': data['Longitude'],
'type': data['Type'],
'RsRq': data['RsRq'],
'RsRp': data['RsRp'],
'SINR': data['SINR'],
'bandwidth': data['Bandwidth']
}
lte.append(packet)
return f"OK", 200
except Exception or JsonError as exc:
print(str(exc))
return "some problem"+str(exc), 201
It seems that you have to configure your logging module. You can replace the Python code print(str(exc)) with app.logger.error(str(exc)) to see if it produces some output. You can click here to find some useful code.
By the way, you can take a look at the content received by your Android client because it should receive the response "some problem"+str(exc).
I do not know much about Android code, but it seems that you are dealing with a wrong JSON string. The right format is as below:
{
"foo":"bar",
"good":"bad"
}
In your Android code, you might have to replace
"\"date\":"+"\""+send_.getString("Date")+","
to
"\"date\":"+"\""+send_.getString("Date")+"\","
The above rule should be applied to all lines in the JSON string. Be careful about the symbol "", and you have to make sure that the data during POST is a valid JSON string. Also, I suggest you use another way like utilizing some libraries to build JSON strings to avoid typos.
Related
I'm using an API that works in 2 steps:
It starts processing of a document in async way where it provides you an id that you use for step 2
It provides an endpoint where you can get the results but only when they are ready. So basically it will always give you a 200 response with some details like the status of the processing.
So the question is how can I implement a custom "success" criteria for the HTTP outbound gateway. I would also like to combine it with a RetryAdvice which I already have implemented.
I've tried the following but first of all the message's payload that is provided in the HandleMessageAdvice is empty, and secondly the retry is not triggered:
.handle(Http.outboundGateway("https://northeurope.api.cognitive.microsoft.com/vision/v3" +
".0/read/analyzeResults/abc")
.mappedRequestHeaders("Ocp-Apim-Subscription-Key")
.httpMethod(HttpMethod.GET), c -> c.advice(this.advices.retryAdvice())
.handleMessageAdvice(new AbstractHandleMessageAdvice() {
#Override
protected Object doInvoke(MethodInvocation invocation, Message<?> message) throws Throwable {
String body = (String) message.getPayload();
if (StringUtils.isEmpty(body))
throw new RuntimeException("Still analyzing");
JSONObject document = new JSONObject(body);
if (document.has("analyzeResult"))
return message;
else
throw new RuntimeException("Still analyzing");
}
}))
I've found this answer from Artem from 4 years back but first of all I didn't find the reply channel method on the outbound gateway and secondly not sure if this scenario has already been improved in the newer version of Spring Integaration: http outbound retry with conditions (For checker condition).
UPDATE
Following Artem's suggestion I have the following:
.handle(Http.outboundGateway("https://northeurope.api.cognitive.microsoft.com/vision/v3" +
".0/read/analyzeResults/abc")
.mappedRequestHeaders("Ocp-Apim-Subscription-Key")
.httpMethod(HttpMethod.GET), c -> c.advice(advices.verifyReplySuccess())
.advice(advices.retryUntilRequestCompleteAdvice()))
And the advice:
#Bean
public Advice verifyReplySuccess() {
return new AbstractRequestHandlerAdvice() {
#Override
protected Object doInvoke(ExecutionCallback callback, Object target, Message<?> message) {
try {
Object payload = ((MessageBuilder) callback.execute()).build().getPayload();
String body = (String) ((ResponseEntity) payload).getBody();
JSONObject document = new JSONObject(body);
if (document.has("analyzeResult"))
return message;
} catch (JSONException e) {
throw new RuntimeException(e);
}
throw new RuntimeException("Still analyzing");
}
};
}
But now when I debug the doInvoke method, the body of the payload is null. It's strange as when I execute the same GET request using Postman, the body is correctly returned. Any idea?
The body from response using Postman looks like this:
{
"status": "succeeded",
"createdDateTime": "2020-09-01T10:55:52Z",
"lastUpdatedDateTime": "2020-09-01T10:55:57Z",
"analyzeResult": {
"version": "3.0.0",
"readResults": [
{
"page": 1,........
Here is the payload that I get from the outbound gateway using callback:
<200,[Transfer-Encoding:"chunked", Content-Type:"application/json; charset=utf-8", x-envoy-upstream-service-time:"27", CSP-Billing-Usage:"CognitiveServices.ComputerVision.Transaction=1", apim-request-id:"a503c72f-deae-4299-9e32-625d831cfd91", Strict-Transport-Security:"max-age=31536000; includeSubDomains; preload", x-content-type-options:"nosniff", Date:"Tue, 01 Sep 2020 19:48:36 GMT"]>
There is indeed no request and reply channel options in Java DSL because you simply wrap that handle() into channel() configuration or just chain endpoints in the flow natural way and they are going to exchange messages using implicit direct channels in between. You can look into Java DSL IntegrationFlow as a <chain> in the XML configuration.
Your advice configuration is a bit wrong: you need declare your custom advice as a first in a chain, so when exception is thrown from there a retry one is going to handle it.
You should also consider to implement an AbstractRequestHandlerAdvice to align it with the RequestHandlerRetryAdvice logic.
You implement there a doInvoke(), call ExecutionCallback.execute() and analyze the result to return as is or throw a desired exception. A result of that call for HttpRequestExecutingMessageHandler is going to be an AbstractIntegrationMessageBuilder and probably a ResponseEntity as a payload to check for your further logic.
Following Artem's suggestion I came up with the following (additional trick was to set the expectedResponseType to String as otherwise using the ResponseEntity the body was empty):
.handle(Http.outboundGateway("https://northeurope.api.cognitive.microsoft.com/vision/v3" +
".0/read/analyzeResults/abc")
.mappedRequestHeaders("Ocp-Apim-Subscription-Key")
.httpMethod(HttpMethod.GET).expectedResponseType(String.class),
c -> c.advice(advices.retryUntilRequestCompleteAdvice())
.advice(advices.verifyReplySuccess()))
And the advice:
#Bean
public Advice verifyReplySuccess() {
return new AbstractRequestHandlerAdvice() {
#Override
protected Object doInvoke(ExecutionCallback callback, Object target, Message<?> message) {
Object payload = ((MessageBuilder) callback.execute()).build().getPayload();
if (((String) payload).contains("analyzeResult"))
return payload;
else
throw new RuntimeException("Still analyzing");
}
};
}
I am new to developing Alexa skills so I am using a sample I found on the web as a C# endpoint hosted on Azure. It works correctly with the Alexa console but when I try to test the same endpoint with the Postman app, I get a 400 error.
When I use the Alexa console, it displays the JSON input that it sends to the endpoint and the JSON output that it receives from the endpoint. If I copy the JSON input and paste it into Postman and send it to the same endpoint, I get a 400 error. Obviously, I am missing something.
The following are my two source files and the JSON input.
RollTheDice.cs
public static class RollTheDice
{
[FunctionName("RollTheDice")]
public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
{
log.Info("C# HTTP trigger function processed a request.");
var speechlet = new RollTheDiceSpeechlet();
return await speechlet.GetResponseAsync(req);
}
}
RollTheDiceSpeechlet.cs
public class RollTheDiceSpeechlet : SpeechletBase, ISpeechletWithContext
{
public SpeechletResponse OnIntent(IntentRequest intentRequest, Session session, Context context)
{
try
{
// Default to 6 sides if not specified
if (!int.TryParse(intentRequest.Intent.Slots["DiceType"].Value, out int numSides))
numSides = 6;
var rollResults = new Random().Next(Math.Max(1, numSides - 1)) + 1; // Account for random returning '0'
return new SpeechletResponse
{
ShouldEndSession = false,
OutputSpeech = new PlainTextOutputSpeech { Text = $"I rolled a {numSides} sided die and got a {rollResults}." }
};
}
catch (Exception ex)
{
return new SpeechletResponse
{
ShouldEndSession = false,
OutputSpeech = new PlainTextOutputSpeech { Text = ex.Message }
};
}
}
public SpeechletResponse OnLaunch(LaunchRequest launchRequest, Session session, Context context)
{
return new SpeechletResponse
{
ShouldEndSession = false,
OutputSpeech = new PlainTextOutputSpeech { Text = "Welcome to the Roll the Dice. Ask me to roll the dice." }
};
}
public void OnSessionEnded(SessionEndedRequest sessionEndedRequest, Session session, Context context)
{
return;
}
public void OnSessionStarted(SessionStartedRequest sessionStartedRequest, Session session, Context context)
{
return;
}
}
JSON Input
Again, everything works fine but when I test it with Postman I get a 404 error.
The endpoint is C# serverless function that I developed in Visual Studio 201.
When I run it locally, I copy/paste the URL in the Postman app and send a post. See attached screenshots.
As the error suggest you are missing Signature and SignatureCertChainUrl headers. These helps to protect your endpoint and verify that incoming requests were sent by Alexa. Any requests coming from other sources should be rejected. When you test it via Test Console these headers are included and you get successful response.
Headers:
Signature
SignatureCertChainUrl
There are two parts to validating incoming requests:
Check the request signature to verify the authenticity of the request.
Check the request timestamp to ensure that the request is not an old request.
More information on verifying that the request was sent by Alexa here
I'm trying to integrate api.ai with android. I have followed the steps required for that. I require integrating text instead of speech. I want to receive the text as input from the user and display it. Can anyone please suggest me the solution for this?
Step 1:Create Configuration for API AI
final AIConfiguration config = new AIConfiguration("<Client access token>",
AIConfiguration.SupportedLanguages.English,
AIConfiguration.RecognitionEngine.System);
aiService = AIService.getService(this, config);
aiService.setListener(this);
aiDataService = new AIDataService(config);
aiRequest = new AIRequest();
Step 2:Set your text here
aiRequest.setQuery(message);
Step 3:Get your response from API AI using AsyncTask
new AsyncTask<AIRequest,Void,AIResponse>(){
#Override
protected AIResponse doInBackground(AIRequest... aiRequests) {
final AIRequest request = aiRequests[0];
try {
final AIResponse response = aiDataService.request(aiRequest);
return response;
} catch (AIServiceException e) {
}
return null;
}
#Override
protected void onPostExecute(AIResponse response) {
if (response != null) {
Result result = response.getResult();
String reply = result.getFulfillment().getSpeech();
sendMessage(message);
mimicOtherMessage(reply);
mListView.setSelection(mAdapter.getCount() - 1);
}
}
}.execute(aiRequest);
If I understand right -- you do not need the Voice input for your Android application and simply want the user to type in the text in their Android application. Post that, you are expecting to pass on that request to API.AI for further processing and a possible response.
If the above is correct, then you do not need any of the Voice capability Activities. Simply take it in the text from the User and pass that on to the API.AI HTTP API.
I'm using Volley to send an http post request with parameters from my android app to my local server running in http://192.168.1.4:3000/battery_signal_report
I'm pretty sure the server is running properly (I checked it with Postman successfully).
also, I successfully sent the request through Android Studio's Emulator using ip 10.0.2.2
Trying to make it work, i used various request implementations including JsonObjectRequest, StringRequest and the custom request described here: Volley JsonObjectRequest Post request not working
Also, I've read somewhere that Volley post requests have some problems with the request header, so i tried to override it in different ways.
Nothing works. onErrorResponse is called every time with an empty VolleyError input.
I've fairly new to android development, so any insights would be much appreciated.
Thanks in advance.
For anyone else coming across this, you need to forget about the header override and setup your own getBodyContentType() and getBody() methods. Follow this pattern:
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, successListener, errorListener) {
#Override
public String getBodyContentType() {
return "application/json; charset=utf-8";//set here instead
}
#Override
public byte[] getBody() {
try {
Map<String, String> params = yourObject.getMappedParams();
JSONObject json = new JSONObject(params);
String requestBody = json.toString();
return requestBody == null ? null : requestBody.getBytes("utf-8");
} catch (UnsupportedEncodingException uee) {
return null;
}
}
};
I've followed instructions on how creating a ServiceStack here at:
https://github.com/ServiceStack/ServiceStack/wiki/Create-your-first-webservice
I'm sure I have followed it to the letter, but as soon as I run the web application. I get a 'Snapshot' view of my response. I understand this happens when I don't have a default view/webpage. I set up the project as a ASP.net website, not a ASP.net MVC website. Could that be the problem?
I also wrote a test console application with the following C# code. It got the response as a HTML webpage rather than as a plain string e.g. "Hello, John".
static void sendHello()
{
string contents = "john";
string url = "http://localhost:51450/hello/";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.ContentLength = contents.Length;
request.ContentType = "application/x-www-form-urlencoded";
// SEND TO WEBSERVICE
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(contents);
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string result = string.Empty;
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
result = reader.ReadToEnd();
}
Console.WriteLine(result);
}
How can I switch off the 'snapshot' view? What am I doing wrong?
The browser is requesting html so ServiceStack is returning the html snapshot.
There are a couple of ways to stop the snapshot view:
First is to use the ServiceClient classes provided by servicestack. These also have the advantage of doing automatic routing and strongly typing the response DTOs.
Next way would be to set the Accept header of the request to something like application/json or application/xml which would serialize the response into json or xml respectively. This is what the ServiceClients do internally
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Accept = "application/json";
...
Another method would be to add a query string parameter called format and set it to json or xml
string url = "http://localhost:51450/hello/?format=json";
Putting the specific format requesting is the practical way to do this
string url = "http://localhost:51450/hello/?format=json";
I suggest simply deleting this feature.
public override void Configure(Container container)
{
//...
this.Plugins.RemoveAll(p => p is ServiceStack.Formats.HtmlFormat);
//...
}
Now all requests with the Content-Type=text/html will be ignored.