Q:

Laravel keeps redirect itself

I am developing website in localhost
If the links is
   http://localhost:12345/laravel/lala/bank/

it will redirect itself to
   http://localhost:12345/bank

but it will work fine without '/'
   http://localhost:12345/laravel/lala/bank

i try to configure at routes.php but it seems useless

A:

Routes aren't the culprit here, it's likely something in your .htaccess. Without seeing it, I guess it's this line (default .htaccess coming in a fresh Laravel install)
# Redirect Trailing Slashes...
RewriteRule ^(.*)/$ /$1 [L,R=301]

Judging by your url, looks like you have the project in a subdirectory:
   http://localhost:12345/laravel/lala/bank/

Try adding a
RewriteBase /laravel/lala/

in your .htaccess. It should look like this now:
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /laravel/lala/

    # Redirect Trailing Slashes...
    RewriteRule ^(.*)/$ /$1 [L,R=301]

    # Handle Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

It happened to me twice, one I solved it like this, the other I went lazy and just commented that line out (#RewriteRule ^(.*)/$ /$1 [L,R=301]) :D, both worked.

