Hello i use same script for Laravel 4.2 and Laravel 5.1 and problem is for Laravel 4.2 work perfectly, but on Laravel 5.1 i can't understand why it's return bad result
Problem is why I got $request->ajax() false for Laravel 5.1? 
routes.php
Route::post('/upload-image', [
    'as' => 'upload-image-post',
    'uses' => 'PageController@profileImage'
]);
PageController.php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Controllers\Controller;
class PageController extends Controller
{
    public function profileImage(Request $request) 
    {
        //here is problem
        //result good: (Laravel 4.2 shows true)
        //result bad: (Laravel 5.1 shows false)
        var_dump($request->ajax());
    }
}
upload-image.blade.php (js)
<script>
jQuery(document).ready(function($) {
    $('#upload_image').click(function(event) {
        $('#image').trigger('click');
    });
    $('#image').change(function(event) {
        /* Act on the event */
        $('#imageform').submit();
    });
    $('#imageform').ajaxForm({      
        beforeSubmit: function() {  
        },
        success: function(msg) {
        },
        error: function(request, status, error) {
        },
        complete: function(xhr) {
            if(xhr.status != 401) {
                $('#image').val('');
                result = xhr.responseText;
                result = $.parseJSON(result);
                if( !$.isEmptyObject(result.file_base_url) ) {
                    var img = new Image();
                    img.onload = function() {
                        $('#register_profile_photo').attr('src', img.src);
                        $('#register_profile_photo').attr('alt', result.image_alt);
                        //spinner.stop();
                        $('#upload-image-error').text('');  
                    }
                    img.src = result.file_base_url;
                } else {
                    $('#upload-image-error').text(result.image[0]); 
                }
            }   
        }
    });
});
upload-image.blade.php (html)
<form enctype="multipart/form-data" name='imageform' role="form" id="imageform" method="post" action="{!! route('upload-image-post') !!}">
    {!! csrf_field() !!}
    <div style="display:none;">
        <input type="file" name="image" id="image" placeholder="Please choose your image" >
    </div>
</form>
<div class="profile-img">
    <img style="float: right" id="register_profile_photo" src="default.png" alt="Default image">
    <div style="float: right" class="img-edit"><a href="javascript:void(0);" id="upload_image">Edit picture</a></div>
</div>
PS. If you test for laravel 4.2 this code need change from "{!! .. !!}" to "{{ .. }}"