apache - 411 error during http post request in java -

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i'am facing 411 error during http post request here code. unable find made mistake.i have set content-length though giving same error.

public map<string, string> getaccesstokens(string yahclientid, string yahclientsceret, string yahredirecturl, string authorizationcode) {     map<string, string> accesstokens = new hashmap();     string url = "https://api.login.yahoo.com/oauth2/get_token";     final string authinfo = yahclientid + ":" + yahclientsceret;      byte[] encodedbytes = base64.decodebase64(authinfo.getbytes());     string postdata = "grant_type=authorization_code&redirect_uri=" + yahredirecturl + "&code=" + authorizationcode;     byte[] ascii = postdata.getbytes(standardcharsets.utf_8);     try{     httpsurlconnection uc = null;     inputstream = null;     outputstream osw = null;     url u = new url(url);     uc = (httpsurlconnection) u.openconnection();     uc.setdoinput(true);     uc.setrequestmethod("post");     uc.setrequestproperty("content-length",""+ postdata.getbytes().length);     uc.setrequestproperty("content-type", "application/x-www-form-urlencoded");     uc.setdooutput(true);     uc.setrequestproperty("authorization", "basic " +new string(new base64().encode(authinfo.getbytes())));     uc.connect();      int responsecode = uc.getresponsecode();      osw = uc.getoutputstream();     uc.getresponsemessage();     osw.write(ascii);     osw.flush();     osw.close();     }catch(exception ex){     logger.error(ex);     }





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