PUT method not working on API

"Method not allowed" means that you are trying to use the wrong HTTP request method on that route, e.g. sending a GET or POST request to a route that is expecting PUT.

Can you show the code for how you are trying to do this request?

Assuming you are just using an HTML form

<form method="POST" action="http://example.com/home/" accept-charset="UTF-8">
    <input type="hidden" name="_method" value="PUT" />
    <!-- The rest of your form -->
</form>

Since the HTML form cannot handle method="PUT" you would need to use method="POST" and the hidden input field with the name _method and as value you can use: DELETE, PUT, PATCH (and the other request methods if I forgot any of them).

You can also get this issue if your route expects a parameter and you don't pass it, or you pass a parameter and there is no place for it in the route.

I have not html form because it will be consumed by another php script via Guzzle or similar. Actually i am using Postman. It works fine with validation on controller, but fails just when uses specific request like "App\Requests\StorePostRequest".

Can you share your StorePostRequest code and the data you are trying to submit?

This the code, very basic, like all tutorials...

class StorePostRequest extends FormRequest
{
    public function authorize()
    {
        return true;
    }

    public function rules()
    {
        return [
            'title' => 'required|between:3,255',
        ];
    }
}

Ok Snapey! I tried both:

Route::resource('posts', 'PostController');

Route::put('PostController', 'create');

try

Route::put('posts', 'PostController@create');

and temporarily comment out any resource route for posts.

You might find it a lot less hassle to just use POST even though its not strictly RESTful