Java HttpClient changing content-type?
Solution 1
Change this:
StringEntity se = new StringEntity(json);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
httppost.setEntity(se);
To this only:
httppost.setEntity(new StringEntity(json.toString(), HTTP.UTF_8));
Solution 2
easy :
import org.apache.http.client.methods.HttpPost;
httppost.setEntity(new StringEntity(json.toString(), org.apache.http.entity.ContentType.APPLICATION_JSON));
Bart
I am an IT enthousiast with an aviation/engineering background. Not sure how long I can still keep up saying I am not a developer. I caught myself sharing a Facebook promo on a t-shirt saying developers don't fix your computer. I do lot's of Python and Javascript. I love combining engineering and aviation with software development. Especially in rapid prototyping of apps.
Updated on June 04, 2020Comments
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Bart almost 4 years
I am building a small app for my Android phone to forward text messages to a webserver using a very basic REST interface.
I am using the android 4.0.3 SDK. I developed the webservice in python using the Django and the Django restframework package. The setup is completely out of the box. There is basically one endpoint that receives a POST of a JSON object holding the message info (sender, body, date). I have tested the service using cURL with the following command:
curl -X POST -H 'Content-Type: application/json' --data '{"sender":"+xxxxxxxx", "body": "test", "send_date":"2011-03-20 16:32:02"}' http://[...]/messages.json
This all works fine and I get the expected response:
{"body": "test", "send_date": "2011-03-20T16:32:02", "id": 25, "sender": "+xxxxxxxxxx"}
Now I set up the android app. It is a simple BroadcastReceiver child class that includes a private AsyncTask class:
private class httpPost extends AsyncTask<String, Void, JSONObject> { protected JSONObject doInBackground(String... args) { // Create a new HttpClient and Post Header HttpClient httpclient = new DefaultHttpClient(); HttpParams myParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(myParams, 10000); HttpConnectionParams.setSoTimeout(myParams, 10000); String url = args[0]; String json=args[1]; JSONObject JSONResponse = null; InputStream contentStream = null; String resultString = ""; try { HttpPost httppost = new HttpPost(url); httppost.setHeader("Content-Type", "application/json"); httppost.setHeader("Accept", "application/json"); StringEntity se = new StringEntity(json); se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json")); httppost.setEntity(se); for (int i=0;i<httppost.getAllHeaders().length;i++) { Log.v("set header", httppost.getAllHeaders()[i].getValue()); } HttpResponse response = httpclient.execute(httppost); // Do some checks to make sure that the request was processed properly Header[] headers = response.getAllHeaders(); HttpEntity entity = response.getEntity(); contentStream = entity.getContent(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } //convert response to string try{ BufferedReader reader = new BufferedReader(new InputStreamReader(contentStream,"iso-8859-1"),8); StringBuilder sb = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } contentStream.close(); resultString = sb.toString(); }catch(Exception e){ e.printStackTrace(); } Log.v("log", resultString); return new JSONObject(); } }
As you can see I am just starting to get familiar with Java and the android SDK so please bear with me. This setup actually worked fine in another app that I build to send JSON strings to a Neo4J webservice.
The problem is that when I post the message via Android to my webservice, at some point the content-type gets changed from 'application/json' to 'application/json, application/json'. The log entry in the headers loop still outputs the correct values for each header, however, the webservice returns this error message:
{"error": "Unsupported media type in request 'application/json, application/json'."}
I am puzzled, any help is welcome.
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Bart about 12 yearsThanks mate!! That was all I needed. @SJuan76 you were right as well, cheers guys, very helpful!
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Danpe over 9 yearsShould be
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
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Cjo almost 4 yearsAddition of HTTP.UTF_8 as charset fixed my issue ... thank you :)