Redirect an url with params

[mediactive]

Hello!
How to keep the Google Click ID (GCLID) in the url following a redirect?
Example: https://www.bressesyndic.com/?gclid=xxxxxx redirected to https://www.bressesyndic.com/fr?gclid=xxxxxx
I thought something like

Route::get('/{param?}', function ($param = 'gclid') {
    return redirect('/fr', ['param'=>$param])
});

might work, but i get a error 500.

[jasonvarga]

What's the error?

[mediactive]

Here is the error message:

Error 500 - Server Error
The address you are trying to reach cannot be found or is unreachable at this time.

Hint:

Check the address you entered and correct it if necessary.
Return to the Home Page
Please report any technical issues.

If I use Route::redirect('/', '/fr', 301); instead of

Route::get('/{param?}', function ($param = 'gclid') {
    return redirect('/fr', ['param'=>$param])
});

i have no error but the new url doesn't get the gclid param.

[mediactive]

It seems to work this way:

Route::get('/', function () {
    $gclid = request()->input('gclid');
    return redirect('/fr?gclid='.$gclid);
});

[ryanmitchell]

You got it sorted but just so you know:

Route::get('/{param?}', function ($param = 'gclid') {
    return redirect('/fr', ['param'=>$param])
});

Would match urls like yoururl.com/gclid, not yoururl.com/?gclid=xxx