Laravel AJAX 500 Internal Server Error, Tokens Match - ajax

Question

When I submit the form, I get this error and the page automatically reloads, but the url in the browser then shows my route and content that I posted in the form. Then, if I go ahead and submit again without reloading the page it works just fine. Could it be that I'm not posting the token itself? I have added the meta tag to the head.
<meta name="csrf-token" content="{{ csrf_token() }}" />
JS:
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
});
$('#postForm').submit(function(){
var body = $('#postbody').val();
var profileId = $('#user_id').text();
$.ajax({
type: "POST",
url: "/post/"+profileId,
data: {post:body, profile_id:profileId},
success: function(data) {
console.log(data);
}
});
});
Route:
Route::post('/post/{id}', [
'uses' => '\App\Http\Controllers\PostController#postMessage',
'as' => 'post.message',
'middleware' => ['auth'],
]);
Controller:
public function postMessage(Request $request, $id)
{
if(Request::ajax())
{
$this->validate($request, [
'post' => 'required|max:1000',
]);
$newMessage = Auth::user()->posts()->create([
'body' => $request->input('post'),
'profile_id' => $id
]);
}
}
View:
<form role="form" action="#" id="postForm">
<div class="feed-post form-group">
<textarea class="form-control feed-post-input" id="postbody" name="post"></textarea>
<div class="btn-bar">
<button type="submit" class="btn btn-default btn-post"></button>
</div>
</div>
<input type="hidden" name="_token" value="{{ csrf_token() }}"/>
</form>
UPDATE:
So, the log says that "Request::ajax() should not be called statically" in my controller. I removed that code and it works fine now. However, I want to know if removing it is ok to do of if there's a better way to resolve this. Thanks!
ANSWER: It works by changing
if (Request::ajax()){
// code...
}
to
if ($request->ajax()){
// code...
}

Answer 1

Change Request::ajax() to $request->ajax()

Answer 2

You are doing an AJAX post – you are not supposed to be redirected anywhere at all. If there is an error – you should only see it in Developers Tools in your browser.
Try adding:
$('#postForm').submit(function(e) {
e.preventDefault();
...
}
So that browser doesn't post the form instead of your AJAX call. Also try fixing your header case: X-CSRF-TOKEN to X-CSRF-Token
Also, your postMessage() method doesn't return anything at all. You should probably notify the user of the result there or just return $newMessage.