I’m trying to build asynchronous follow mechanic using ajax and Laravel. I have two button id’s; follow-up, unfollow. And also there is back-end in blade whether profile is being follow by auth user. If auth user is following the user unfollow button shows up and vice versa. And i also changed id of current button to opposite of it(for follow-up unfollow form unfollow follow-up). But everytime i follow user and try to unfollow it it gives me POST http://localhost:8000/unfollow 404 (Not Found) and error occurs vice versa. Here is my code samples:

Blade

 @auth
                                   @if(auth()->user()->username != $user->username)
                                        <div class="author-btn">
                                            @if(auth()->user()->getFollowing()->where('following_id', $user->id)->first())
                                                <button data-target="{{ $user->username }}" id="unfollow" class="btn btn--md btn--round">
                                                    Takipten çık
                                                </button>
                                            @else
                                                <button data-target="{{ $user->username }}" id="follow-up" class="btn btn--md btn--round">
                                                    Takip et
                                                </button>
                                            @endif
                                        </div>
                                        <!-- end /.author-btn -->
                                    @endif
                                @endauth

Javascript

$(document).ready(function() {
                $('#follow-up').on('click', function(e){
                    e.preventDefault();

                    var t = $('#follow-up');

                    $.ajaxSetup({
                        headers: {
                            'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                        }
                    });

                    $.ajax({
                        /* the route pointing to the post function */
                        url: '{{ route("follow_up") }}',
                        type: 'POST',
                        /* send the csrf-token and the input to the controller */
                        data: {target:t.attr('data-target')},
                        dataType: 'JSON',
                        /* remind that 'data' is the response of the AjaxController */
                        success: function (data) {
                            t.html('Takipten çık');
                            t.attr('id', 'unfollow');
                            alert(data.msg);
                        },
                        error:function(){
                            alert("İşlem sırasında bir hata oluştu.");
                        },
                    });
                });

                $('#unfollow').on('click', function(e){
                    e.preventDefault();

                    var t = $('#unfollow');

                    $.ajaxSetup({
                            headers: {
                                'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                            }
                        });

                        $.ajax({
                            /* the route pointing to the post function */
                            url: '{{ route("un_follow") }}',
                            type: 'POST',
                            /* send the csrf-token and the input to the controller */
                            data: {target:t.attr('data-target')},
                            dataType: 'JSON',
                            /* remind that 'data' is the response of the AjaxController */
                            success: function (data) {
                                t.html('Takip et');
                                t.attr('id', 'follow-up');
                                alert(data.msg);
                            },
                            error:function(){
                                alert("İşlem sırasında bir hata oluştu.");
                            },
                        });
                    });
            });

Source: Laravel