使用laravel渲染站点地图时出错

Question

I have a problem rendering a sitemap with laravel. Generated xml seems ok but when i try to call the url from chrome or firefox i got an error

 error on line 2 at column 6: XML declaration allowed only at the start of the document

In fact line 1 of the document is empty and xml declaration starts on line 2

Here is my code :

 return Response::view('sitemap.index', ['agences' => $agences])->header('Content-Type', 'application/xml');

i tried that syntax too :

 $xml = View::make('sitemap.index', ['agences' => $agences]);
 return Response::make($xml, 200)->header('Content-Type', 'application/xml');

That way i could do

 dd($xml->render()); 

and realize the string returned has no empty first line. So i'm guessing Response::make is the one to blame but i really have no idea where to look from there

Answer 1

Ok I'm gonna post my own answer cause that was tricky and it costs me a day, the good thing is my knowledge of laravel has slightly increased.

So i had my xml sitemap beginning with an empty line, and that created an error on browser. Xml was first generated using a blade template. As it didn't work i decided to use RoumenDamianoff/laravel-sitemap

But i had the same problem. So finally i decided to generate Xml myself again using SimpleXmlElement and it changes nothing.

At that point i begun to dig in Laravel internal's to see where that empty line could come from in the request lifecycle.

Basically my sitemap is very simple :

$urlset = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" /><!--?xml version="1.0" encoding="UTF-8"?-->');
datas = MyModel::All();
foreach($datas as $index=>$data){
// generate sitemap
}
$dom = new DomDocument();
$dom->loadXML($urlset->asXML());
$dom->formatOutput = true;
//output xml
$xml = $dom->saveXML();
$response = Response::make($xml, 200, ['Content-Type' => 'application/xml']);

Just to test i decided to change the model i was requesting, and then my xml generated without that first empty line. So i decided to investigate the model itself and find the error. The model file just had an empty line before php opening tag.

Deleting that empty line has solved my problem ....