title: .netCore api gets the same parameter to controller every time from front end part which is Angular
body: <p>i have a very wierd problem,from my mutiselectbox i pick a value which should be sent to back end,first time i do it gets the value and works fine,but second,....value i pick from my multiselect i still get the first value in my back end:</p>
  
  <pre><code>get in average(ip){
  url_avgWind="http://localhost:59628/api/Reports/avgWind";
  console.log("here is my ip:"+ip);
   return this.http.post(this.url_avgWind,{},{params:{ipAddress:ip}});
  </code></pre>
  
  <p>}</p>
  
  <p>in my back end which i get the same IP:</p>
  
  <pre><code> [HttpPost]
  
      public IActionResult avgWind(string ipAddress)
      {
  
          var rslt = _windspd.avgWind(ipAddress);
          return Ok(rslt);
      }
  </code></pre>
  
  <p>the issue is my ipadress is the same everytime and does not change!any idea?</p>