asp.net web api - WebApi returns 417 exception on android HttpUrlConnection(post) -

im trying send , recieve data web server post method in android .

this url call method :

        inputstream input = null;         outputstream output = null;         dataoutputstream printout;         httpurlconnection connection = null;         try {             url url = new url(surl[0]);             connection = (httpurlconnection) url.openconnection();             connection.setreadtimeout(180000);             connection.setconnecttimeout(180000);             connection.setdoinput(true);             connection.setdooutput(true);             connection.setrequestproperty("content-type", "application/json");             connection.setrequestproperty("accept", "application/json");              connection.setrequestmethod("post");               connection.connect();                 jsonobject jsonparam = new jsonobject();                 jsonparam.put("imei",imei);                 packagemanager manager = this.context.getpackagemanager();                 packageinfo info = null;                 try {                     info = manager.getpackageinfo(                         this.context.getpackagename(), 0);                 } catch (namenotfoundexception e) {                     // todo auto-generated catch block                     e.printstacktrace();                 }                 string version = info.versionname;                 jsonparam.put("version",version);                 byte[] data_ = null;                 try {                     data_ = jsonparam.tostring().getbytes("utf-8");                 } catch (unsupportedencodingexception e1) {                     e1.printstacktrace();                 }                 string base64 = base64.encodetostring(data_, base64.default);                 printout = new dataoutputstream(connection.getoutputstream ());                 printout.writebytes(base64);                 printout.flush ();                 printout.close ();             if (connection.getresponsecode() != httpurlconnection.http_ok) {                 return "server returned http " + connection.getresponsecode()                         + " " + connection.getresponsemessage();             }              int filelength = connection.getcontentlength();              // download file             input = connection.getinputstream();             string apk_path = environment.getexternalstoragedirectory() + "/download/";              file dir = new file (apk_path);             dir.mkdirs();             file _file = new file(dir, "mynew.apk");             boolean deleted = _file.delete();             output = new fileoutputstream(_file);             byte data[] = new byte[4096];             long total = 0;             int count;             while ((count = input.read(data)) != -1) {                 // allow canceling button                 if (iscancelled()) {                     input.close();                     return null;                 }                 total += count;                 // publishing progress....                 if (filelength > 0) // if total length known                     publishprogress((int) (total * 100 / filelength));                 output.write(data, 0, count);             }         } catch (exception e) {             return e.tostring();         } {             try {                 if (output != null)                     output.close();                 if (input != null)                     input.close();             } catch (ioexception ignored) {             }              if (connection != null)              connection.disconnect();         }         return null;     } 

and returns 417 exception server.

im using webapi + squid proxy. put line in webconfig :

<system.net>     <settings>         <servicepointmanager expect100continue="false" />     </settings> </system.net> 

but didnt help.

in fixed problem :

httpclient httpclient = new defaulthttpclient();  httpparams params = httpclient.getparams();  params.setparameter(coreprotocolpnames.use_expect_continue,false); 

but how can use httpparams inside httpurlconnection ?!

just set false static property system.net :

system.net.servicepointmanager.expect100continue = false; 

inspire form this answer.