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Laravel Middleware: Header May Not Contain More Than A Single Header, New Line Detected

Laravel's Authenticate middleware gets the path users should be redirected to when they are not unauthenticated, and by default redirects users to /login. I want to implement an added functionality of redirecting the user with a message (such as session time of XYZ mins expired or kindly login to continue). So my Authenticate middleware looks like this:

namespace App\Http\Middleware;

use Illuminate\Auth\Middleware\Authenticate as Middleware;
use Illuminate\Http\Exceptions\HttpResponseException;

class Authenticate extends Middleware
{
    /**
     * Get the path the user should be redirected to when they are not authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string
     */
    protected function redirectTo($request)
    {
        if($request->is('api/*'))
        {
            throw new HttpResponseException(response()->error(['failure_reason'=>'Fresh Access Token Required'], 'Unauthorized Request', 401));  
        }

        if (!$request->expectsJson()) {
            // return route('login');
            $request->headers->set('Accept', 'application/json');
            return redirect("/login")->with("message", "Exceeded an inactivity period of over 15 mins. Kindly re-login to continue");
        }

    }

}

With or without $request->headers->set('Accept', 'application/json');, I keep getting this error: Header may not contain more than a single header, new line detected. Any ideas on how to resolve this?

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Answer

With suggestions from @ourmandave and [https://laracasts.com/discuss/channels/laravel/method-redirectto-with-a-flash-message][2], I learnt that the redirectTo() wants to return the redirect route name, not actually redirect. So you should flash the 'message' to your session and then return the redirect '/login'. So I edited my code to look like this below, and it now works:

namespace App\Http\Middleware;

use Illuminate\Auth\Middleware\Authenticate as Middleware;
use Illuminate\Http\Exceptions\HttpResponseException;

class Authenticate extends Middleware
{
    /**
     * Get the path the user should be redirected to when they are not authenticated.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return string
     */
    protected function redirectTo($request)
    {
        if($request->is('api/*'))
        {
            throw new HttpResponseException(response()->error(['failure_reason'=>'Fresh Access Token Required'], 'Unauthorized Request', 401));  
        }

        if (!$request->expectsJson()) {
            session()->flash('message', 'Exceeded an inactivity period of over 15 mins. Kindly re-login to continue'); 
            return route('login');
        }

    }

}  
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source: stackoverflow.com
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