Method Not Allowed http exception using AJAX in Laravel -

what causing exception? meaning of methodnotallowedexception? using laravel 5.2.

html , input fields:

<div class="form-group"> <label class="control-label">name</label> <input type="text" class="form-control" name="name" id="name" data-validate="required" placeholder="enter name" />                     </div>  <div class="form-group">  <label class="control-label">detail</label>         <textarea class="form-control" name="detail" id="detail" placeholder="enter detail"></textarea>                      </div> <input type="hidden" id="_token" name="_token" value="{{ csrf_token() }}">           <div class="form-group col-sm-offset-3">                         <button type="submit" onclick="postdata();" id="post" class="btn btn-success">submit now</button>                      </div> 

ajax function:

function postdata(){     var name=$('#name').val();    var detail=$('#detail').val();     var token=$('#_token').val();     $.ajax({                     type: 'post',                     url: '{{url("/posts")}}',                     data: "name="+ name + "&detail="+ detail+"&_token="+ token ,                     success: function(data){                       }  }); } 

route:

route::post('/posts', 'cdesigination@index'); 

error after clicking button:

methodnotallowedhttpexception in routecollection.php line 219:      in routecollection.php line 219     @ routecollection->methodnotallowed(array('get', 'head')) in routecollection.php line 206     @ routecollection->getrouteformethods(object(request), array('get', 'head')) in routecollection.php line 158     @ routecollection->match(object(request)) in router.php line 823     @ router->findroute(object(request)) in router.php line 691 

check routes.php file, method using request, should like: route::post('/posts', 'anycontroller@method');