Symfony-docs: Symfony 4: No route found for "GET /" just after installation

[zer0uno]

I'm starting out with Symfony 4 following this guide https://symfony.com/doc/current/setup.html, so I have executed one after the other these commands:

1. composer create-project symfony/website-skeleton my-project
2. cd my-project
3. composer require server --dev
4. php bin/console server:run

but when I browse to http://localhost:8000 I get a No route found for "GET /" error.

[javiereguiluz]

I can reproduce this bug with the given steps. Now let's find the cause of it and fix it. Thanks!

[javiereguiluz]

I've just debug the error. The problem is that this code in PhpMatcherDumper.php never gets executed because $code is not empty:

        if ('' === $code) {
            $code .= "        if ('/' === \$pathinfo) {\n";
            $code .= "            throw new Symfony\Component\Routing\Exception\NoConfigurationException();\n";
            $code .= "        }\n";
        }

In my case, the $code variable contained:

PhpMatcherDumper.php on line 157:
"""
        if (0 === strpos($pathinfo, '/_')) {\n
            // _twig_error_test\n
            if (0 === strpos($pathinfo, '/_error') && preg_match('#^/_error/(?P<code>\\d+)(?:\\.(?P<_format>[^/]++))?$#s', $pathinfo, $matches)) {\n
                return $this->mergeDefaults(array_replace($matches, array('_route' => '_twig_error_test')), array (  '_controller' => 'twig.controller.preview_e ▶
            }\n
\n
            // _wdt\n
            if (0 === strpos($pathinfo, '/_wdt') && preg_match('#^/_wdt/(?P<token>[^/]++)$#s', $pathinfo, $matches)) {\n
                return $this->mergeDefaults(array_replace($matches, array('_route' => '_wdt')), array (  '_controller' => 'web_profiler.controller.profiler:tool ▶
            }\n
\n
            if (0 === strpos($pathinfo, '/_profiler')) {\n
                // _profiler_home\n
                if ('/_profiler' === $trimmedPathinfo) {\n
                    $ret = array (  '_controller' => 'web_profiler.controller.profiler:homeAction',  '_route' => '_profiler_home',);\n
                    if (substr($pathinfo, -1) !== '/') {\n
                        return array_replace($ret, $this->redirect($rawPathinfo.'/', '_profiler_home'));\n
                    }\n
\n
                    return $ret;\n
                }\n
\n
                if (0 === strpos($pathinfo, '/_profiler/search')) {\n
                    // _profiler_search\n
                    if ('/_profiler/search' === $pathinfo) {\n
                        return array (  '_controller' => 'web_profiler.controller.profiler:searchAction',  '_route' => '_profiler_search',);\n
                    }\n
\n
                    // _profiler_search_bar\n
                    if ('/_profiler/search_bar' === $pathinfo) {\n
                        return array (  '_controller' => 'web_profiler.controller.profiler:searchBarAction',  '_route' => '_profiler_search_bar',);\n
                    }\n
\n
                }\n
\n
                // _profiler_phpinfo\n
                if ('/_profiler/phpinfo' === $pathinfo) {\n
                    return array (  '_controller' => 'web_profiler.controller.profiler:phpinfoAction',  '_route' => '_profiler_phpinfo',);\n
                }\n
\n
                // _profiler_search_results\n
                if (preg_match('#^/_profiler/(?P<token>[^/]++)/search/results$#s', $pathinfo, $matches)) {\n
                    return $this->mergeDefaults(array_replace($matches, array('_route' => '_profiler_search_results')), array (  '_controller' => 'web_profiler. ▶
                }\n
\n
                // _profiler_open_file\n
                if ('/_profiler/open' === $pathinfo) {\n
                    return array (  '_controller' => 'web_profiler.controller.profiler:openAction',  '_route' => '_profiler_open_file',);\n
                }\n
\n
                // _profiler\n
                if (preg_match('#^/_profiler/(?P<token>[^/]++)$#s', $pathinfo, $matches)) {\n
                    return $this->mergeDefaults(array_replace($matches, array('_route' => '_profiler')), array (  '_controller' => 'web_profiler.controller.prof ▶
                }\n
\n
                // _profiler_router\n
                if (preg_match('#^/_profiler/(?P<token>[^/]++)/router$#s', $pathinfo, $matches)) {\n
                    return $this->mergeDefaults(array_replace($matches, array('_route' => '_profiler_router')), array (  '_controller' => 'web_profiler.controll ▶
                }\n
\n
                // _profiler_exception\n
                if (preg_match('#^/_profiler/(?P<token>[^/]++)/exception$#s', $pathinfo, $matches)) {\n
                    return $this->mergeDefaults(array_replace($matches, array('_route' => '_profiler_exception')), array (  '_controller' => 'web_profiler.contr ▶
                }\n
\n
                // _profiler_exception_css\n
                if (preg_match('#^/_profiler/(?P<token>[^/]++)/exception\\.css$#s', $pathinfo, $matches)) {\n
                    return $this->mergeDefaults(array_replace($matches, array('_route' => '_profiler_exception_css')), array (  '_controller' => 'web_profiler.c ▶
                }\n
\n
            }\n
\n
        }\n
\n
"""

Maybe @yceruto, who created that code, can help us solve this problem. Thanks!

[yceruto]

Sadly, the trick (upon installation) only works if there is no package that adds a route to the application, and that isn't the case for symfony/website-skeleton and its dev-requirement: symfony/profiler-pack -> symfony/web-profiler-bundle, symfony/twig-bundle

See recipe symfony/web-profiler-bundle, same if symfony/twig-bundle was installed.

[javiereguiluz]

Just thinking out loud: could we detect somehow in the dumper if there's any route associated with the / path and if there's none, add it like in the previous trick? Thanks!

[javiereguiluz]

@yceruto this super quick and dirty code solves the problem:

$homepageIsDefined = false;
foreach ($collection as $dumperRoute) {
    if ('/' === $dumperRoute->getRoute()->getPath()) {
        $homepageIsDefined = true;
        break;
    }
}

if (!$homepageIsDefined) {
    $code .= "        if ('/' === \$pathinfo) {\n";
    $code .= "            throw new Symfony\Component\Routing\Exception\NoConfigurationException();\n";
    $code .= "        }\n";
}

[VladimirShaganian]

The same problem.

[javiereguiluz]

@yceruto I've proposed a simpler solution in https://github.com/symfony/symfony/pull/26041 Hopefully it will fix this issue.

[javiereguiluz]

I'm closing this issue because we are working on it on the code repository, which is where this can be fixed. Thanks!

[zacpattersondc]

I had the same issue. I fixed it by creating a controller and modifying the routes.yami file. This video shows the solution at around 11:30 https://www.youtube.com/watch?v=t5ZedKnWX9E

[yceruto]

I'm not sure to understand the downvotes on this comment, the fix was merged and will be out in the next release, so this documentation will be fine.

[Schrodinger0]

same problem .. anything useful here ?

[xabbuh]

@Schrodinger0 What do you mean with "same problem"?

[Schrodinger0]

just after Installation

[xabbuh]

That's expected, a new application has no default route. But there should be a nice page nonetheless displaying some information. And you can then continue creating your first page as described at https://symfony.com/doc/current/page_creation.html.