asynchronous - Android Volley makes 2 requests to the server when retry policy is set to 0 -

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I am working on an Android project which uses volley for async requests and image caching. Either way the request is crashing on the server twice, even when I have retried the policy to retry. I tried to override the values ​​from the DefaultRetryPolicy object without any success. Here are some sample codes:

Request: 

  @Override public zero gravarVendaMobile (last usuario usuarioAutenticado , Last AsyncCallback & lt; String & gt; Callback) {obterParametrosDeInicializacao () New (New.DoneCallback & lt; ParametrosDeInicializacao & gt; () {@Override Public on Zero Don (Ultimate ParametrosDeInicializacao param) {requestQueue.add (setDefaultRetryPolicy) ( New string request (method POST, urlPara (GRAVAR_VENDA_MOBILE, usuarioAutenticado.getFilial (), usuarioAutenticado.getCodigo ()), listener (Callback), //errorListener (R.string.could_not_load_produtos, callback) New ErrorListener () {@Override Public Zero onErrorResponse (VolleyError Error) {callback.onError (New MessageCodeException (error.networkResponse.statusCode, Error))}} ) {@Override Public map & lt; string, string & gt; getHeaders () throws AuthFailureError {Map & quot; string, string & gt; Header = new HashMap & LT; String, string & gt; (); Headers.put ("encoding", "UTF-8"); Header .put ("accept", "app / jason"); Header .put ("content-type", "app / jason; charset = UTF-8"); Return header;}}));}};}   
 Retry policy:  
  Private request & lt ;? & Gt; SetDefaultRetryPolicy (request & lt;? & Gt; request) {request.setRetryPolicy (New DefaultRetryPolicy (30000, 0, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT)); Return request;}   
 Actually, I want to set the timeout of 30 seconds with 0 retrieve.  
 If I increase the number of retrieves then it expects that works, but if I set it to 0 then 2 requests.  
 Here's some help needed.  
  Edit   
 In order to keep false things inside Android, I have been able to solve my problem, for example:  
  System.setProperty ("http.keepAlive", "false");   
 I've added the code of this line inside of the square where I import and request a request.  
 Also, check whether your server has a fixed header.  
 There was a solution to this.   
 
 
 I use it to set poles again:  
 < Code> myRequest.setRetryPolicy (new DefaultRetryPolicy (0, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

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