android - HTTP Post Only works with default HttpClient, not with OkHttpClient -

i'm working on project requires me send post request http://sagecell.sagemath.org/kernel (just post, no data)along 2 headers, accept-encoding:identity , accepted_tos:true.

this works fine if using default httpclient so:

httpclient = new defaulthttpclient();  httppost httppost = new httppost();  string url = urlutils.getkernelurl();  httppost.seturi(uri.create(url));  arraylist<namevaluepair> postparameters = new arraylist<namevaluepair>(); postparameters.add(new basicnamevaluepair(header_accept_encoding,value_identity)); postparameters.add(new basicnamevaluepair(header_tos,"true")); httppost.setentity(new urlencodedformentity(postparameters));  httpresponse httpresponse = httpclient.execute(httppost); inputstream inputstream = httpresponse.getentity().getcontent();  websocketresponse = gson.fromjson(new inputstreamreader(inputstream), websocketresponse.class); inputstream.close(); 

however if want use same thing using okhttpclient, gives me 403 error:

httpclient = new okhttpclient();  public static final mediatype jsonmediatype = mediatype.parse("application/json; charset=utf-8");  requestbody body = requestbody.create(jsonmediatype, "");  request request = new request.builder()         .addheader(header_accept_encoding, value_identity)         .addheader(header_tos, "true")         .url(url)         .post(body) //i've tried null here         .build();  response response = httpclient.newcall(request).execute();  log.i(tag,"status code"+response.code()); //this 403 

this same story libraries ion , httpurlconnection, apache client seems work.

any answers why isn't working appreciated.

error 403 means forbidden server. , in first case(while using default httpclient ) not adding header, adding name-value pair entity. add header should use

httppost.addheader("key","value");