private HttpEntityEnclosingRequestBase addEntityToRequestBase(
      HttpEntityEnclosingRequestBase requestBase, HttpEntity entity) {
    if (entity != null) {
      requestBase.setEntity(entity);
    }

    return requestBase;
  }
 /**
  * Perform a HTTP POST request and track the Android Context which initiated the request. Set
  * headers only for this request
  *
  * @param context the Android Context which initiated the request.
  * @param url the URL to send the request to.
  * @param headers set headers only for this request
  * @param params additional POST parameters to send with the request.
  * @param contentType the content type of the payload you are sending, for example
  *     application/json if sending a json payload.
  * @param responseHandler the response handler instance that should handle the response.
  */
 public void post(
     Context context,
     String url,
     Header[] headers,
     RequestParams params,
     String contentType,
     AsyncHttpResponseHandler responseHandler) {
   HttpEntityEnclosingRequestBase request = new HttpPost(url);
   if (params != null) request.setEntity(paramsToEntity(params));
   if (headers != null) request.setHeaders(headers);
   sendRequest(cachingHttpClient, httpContext, request, contentType, responseHandler, context);
 }