diff --git a/app/Client/Client.php b/app/Client/Client.php
index b1a9068..913e186 100644
--- a/app/Client/Client.php
+++ b/app/Client/Client.php
@@ -107,7 +107,7 @@ class Client
 
                 $connection->on('authenticated', function ($data) use ($deferred, $sharedUrl) {
                     $httpProtocol = $this->configuration->port() === 443 ? 'https' : 'http';
-                    $host = $data->server_host;
+                    $host = $data->server_host ?? $this->configuration->host();
 
                     $this->logger->info($data->message);
                     $this->logger->info("Local-URL:\t\t{$sharedUrl}");
@@ -116,7 +116,7 @@ class Client
                     $this->logger->info("Expose-URL:\t\thttps://{$data->subdomain}.{$host}");
                     $this->logger->line('');
 
-                    static::$subdomains[] = "{$httpProtocol}://{$data->subdomain}.{$data->server_host}";
+                    static::$subdomains[] = "{$httpProtocol}://{$data->subdomain}.{$host}";
 
                     $deferred->resolve($data);
                 });
diff --git a/app/Client/Http/HttpClient.php b/app/Client/Http/HttpClient.php
index 0227eea..77d8099 100644
--- a/app/Client/Http/HttpClient.php
+++ b/app/Client/Http/HttpClient.php
@@ -8,7 +8,6 @@ use App\Logger\RequestLogger;
 use Clue\React\Buzz\Browser;
 use GuzzleHttp\Psr7\Message;
 use function GuzzleHttp\Psr7\parse_request;
-use function GuzzleHttp\Psr7\str;
 use Laminas\Http\Request;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
@@ -86,7 +85,7 @@ class HttpClient
     protected function sendRequestToApplication(RequestInterface $request, $proxyConnection = null)
     {
         (new Browser($this->loop, $this->createConnector()))
-            ->withFollowRedirects(true)
+            ->withFollowRedirects(false)
             ->withRejectErrorResponse(false)
             ->requestStreaming(
                 $request->getMethod(),
@@ -106,7 +105,7 @@ class HttpClient
                 /* @var $body \React\Stream\ReadableStreamInterface */
                 $body = $response->getBody();
 
-                $this->logResponse(str($response));
+                $this->logResponse(Message::toString($response));
 
                 $body->on('data', function ($chunk) use ($proxyConnection, $response) {
                     $response->buffer .= $chunk;
diff --git a/app/Contracts/SubdomainRepository.php b/app/Contracts/SubdomainRepository.php
index e1c46a4..f55339f 100644
--- a/app/Contracts/SubdomainRepository.php
+++ b/app/Contracts/SubdomainRepository.php
@@ -14,6 +14,8 @@ interface SubdomainRepository
 
     public function getSubdomainByNameAndDomain(string $name, string $domain): PromiseInterface;
 
+    public function getSubdomainsByNameAndDomain(string $name, string $domain): PromiseInterface;
+
     public function getSubdomainsByUserId($id): PromiseInterface;
 
     public function getSubdomainsByUserIdAndName($id, $name): PromiseInterface;
diff --git a/app/Server/Http/Controllers/Admin/StoreSubdomainController.php b/app/Server/Http/Controllers/Admin/StoreSubdomainController.php
index a590b55..8cac94c 100644
--- a/app/Server/Http/Controllers/Admin/StoreSubdomainController.php
+++ b/app/Server/Http/Controllers/Admin/StoreSubdomainController.php
@@ -77,12 +77,6 @@ class StoreSubdomainController extends AdminController
                 $this->subdomainRepository
                     ->storeSubdomain($insertData)
                     ->then(function ($subdomain) use ($httpConnection) {
-                        if (is_null($subdomain)) {
-                            $httpConnection->send(respond_json(['error' => 'The subdomain is already taken.'], 422));
-                            $httpConnection->close();
-
-                            return;
-                        }
                         $httpConnection->send(respond_json(['subdomain' => $subdomain], 200));
                         $httpConnection->close();
                     });
diff --git a/app/Server/Http/Controllers/ControlMessageController.php b/app/Server/Http/Controllers/ControlMessageController.php
index 69102ae..caf11ab 100644
--- a/app/Server/Http/Controllers/ControlMessageController.php
+++ b/app/Server/Http/Controllers/ControlMessageController.php
@@ -275,7 +275,7 @@ class ControlMessageController implements MessageComponentInterface
 
             $this->domainRepository
                 ->getDomainsByUserId($user['id'])
-                ->then(function ($domains) use ($connection, $deferred , $serverHost) {
+                ->then(function ($domains) use ($connection, $deferred, $serverHost) {
                     $userDomain = collect($domains)->first(function ($domain) use ($serverHost) {
                         return strtolower($domain['domain']) === strtolower($serverHost);
                     });
@@ -323,9 +323,13 @@ class ControlMessageController implements MessageComponentInterface
          * Check if the given subdomain is reserved for a different user.
          */
         if (! is_null($subdomain)) {
-            return $this->subdomainRepository->getSubdomainByNameAndDomain($subdomain, $serverHost)
-                ->then(function ($foundSubdomain) use ($connection, $subdomain, $user, $serverHost) {
-                    if (! is_null($foundSubdomain) && ! is_null($user) && $foundSubdomain['user_id'] !== $user['id']) {
+            return $this->subdomainRepository->getSubdomainsByNameAndDomain($subdomain, $serverHost)
+                ->then(function ($foundSubdomains) use ($connection, $subdomain, $user, $serverHost) {
+                    $ownSubdomain = collect($foundSubdomains)->first(function ($subdomain) use ($user) {
+                        return $subdomain['user_id'] === $user['id'];
+                    });
+
+                    if (count($foundSubdomains) > 0 && ! is_null($user) && is_null($ownSubdomain)) {
                         $message = config('expose.admin.messages.subdomain_reserved');
                         $message = str_replace(':subdomain', $subdomain, $message);
 
diff --git a/app/Server/Http/Controllers/TunnelMessageController.php b/app/Server/Http/Controllers/TunnelMessageController.php
index f3e107f..c06648f 100644
--- a/app/Server/Http/Controllers/TunnelMessageController.php
+++ b/app/Server/Http/Controllers/TunnelMessageController.php
@@ -79,7 +79,7 @@ class TunnelMessageController extends Controller
 
     protected function detectServerHost(Request $request): ?string
     {
-        return Str::after($request->header('Host'), '.');
+        return Str::before(Str::after($request->header('Host'), '.'), ':');
     }
 
     protected function sendRequestToClient(Request $request, ControlConnection $controlConnection, ConnectionInterface $httpConnection)
diff --git a/app/Server/SubdomainRepository/DatabaseSubdomainRepository.php b/app/Server/SubdomainRepository/DatabaseSubdomainRepository.php
index eaf3d00..f599204 100644
--- a/app/Server/SubdomainRepository/DatabaseSubdomainRepository.php
+++ b/app/Server/SubdomainRepository/DatabaseSubdomainRepository.php
@@ -73,6 +73,22 @@ class DatabaseSubdomainRepository implements SubdomainRepository
         return $deferred->promise();
     }
 
+    public function getSubdomainsByNameAndDomain(string $name, string $domain): PromiseInterface
+    {
+        $deferred = new Deferred();
+
+        $this->database
+            ->query('SELECT * FROM subdomains WHERE subdomain = :name AND domain = :domain', [
+                'name' => $name,
+                'domain' => $domain,
+            ])
+            ->then(function (Result $result) use ($deferred) {
+                $deferred->resolve($result->rows);
+            });
+
+        return $deferred->promise();
+    }
+
     public function getSubdomainsByUserId($id): PromiseInterface
     {
         $deferred = new Deferred();
@@ -92,23 +108,14 @@ class DatabaseSubdomainRepository implements SubdomainRepository
     {
         $deferred = new Deferred();
 
-        $this->getSubdomainByName($data['subdomain'])
-            ->then(function ($registeredSubdomain) use ($data, $deferred) {
-                if (! is_null($registeredSubdomain)) {
-                    $deferred->resolve(null);
-
-                    return;
-                }
-
-                $this->database->query("
-                    INSERT INTO subdomains (user_id, subdomain, domain, created_at)
-                    VALUES (:user_id, :subdomain, :domain, DATETIME('now'))
-                ", $data)
+        $this->database->query("
+            INSERT INTO subdomains (user_id, subdomain, domain, created_at)
+            VALUES (:user_id, :subdomain, :domain, DATETIME('now'))
+        ", $data)
+            ->then(function (Result $result) use ($deferred) {
+                $this->database->query('SELECT * FROM subdomains WHERE id = :id', ['id' => $result->insertId])
                     ->then(function (Result $result) use ($deferred) {
-                        $this->database->query('SELECT * FROM subdomains WHERE id = :id', ['id' => $result->insertId])
-                            ->then(function (Result $result) use ($deferred) {
-                                $deferred->resolve($result->rows[0]);
-                            });
+                        $deferred->resolve($result->rows[0]);
                     });
             });
 
diff --git a/builds/expose b/builds/expose
index 5ca5876..3ee298d 100755
Binary files a/builds/expose and b/builds/expose differ
diff --git a/docs/getting-started/installation.md b/docs/getting-started/installation.md
index dcfd29d..38e4cf8 100644
--- a/docs/getting-started/installation.md
+++ b/docs/getting-started/installation.md
@@ -13,6 +13,31 @@ composer global require beyondcode/expose
 
 After that, you are ready to go and can [share your first site](/docs/expose/getting-started/sharing-your-first-site).
 
+## As a docker container
+
+Expose has a `Dockerfile` already in the source root.
+You can build and use it without requiring any extra effort.
+
+```bash
+docker build -t expose .
+```
+
+Usage:
+
+```bash
+docker run expose <expose command>
+```
+
+Examples:
+
+```bash
+docker run expose share http://192.168.2.100 # share a local site
+docker run expose serve my-domain.com # start a server
+```
+
+Now you're ready to go and can [share your first site](/docs/expose/getting-started/sharing-your-first-site).
+
+
 ### Extending Expose
 
 By default, Expose comes as an executable PHAR file. This allows you to use all Expose features out of the box – without any additional setup required.
diff --git a/tests/Feature/Server/ApiTest.php b/tests/Feature/Server/ApiTest.php
index 9026bc2..b53111a 100644
--- a/tests/Feature/Server/ApiTest.php
+++ b/tests/Feature/Server/ApiTest.php
@@ -424,65 +424,6 @@ class ApiTest extends TestCase
         $this->assertCount(0, $subdomains);
     }
 
-    /** @test */
-    public function it_can_not_reserve_an_already_reserved_subdomain()
-    {
-        /** @var Response $response */
-        $response = $this->await($this->browser->post('http://127.0.0.1:8080/api/users', [
-            'Host' => 'expose.localhost',
-            'Authorization' => base64_encode('username:secret'),
-            'Content-Type' => 'application/json',
-        ], json_encode([
-            'name' => 'Marcel',
-            'can_specify_subdomains' => 1,
-        ])));
-
-        $user = json_decode($response->getBody()->getContents())->user;
-
-        $this->await($this->browser->post('http://127.0.0.1:8080/api/subdomains', [
-            'Host' => 'expose.localhost',
-            'Authorization' => base64_encode('username:secret'),
-            'Content-Type' => 'application/json',
-        ], json_encode([
-            'subdomain' => 'reserved',
-            'auth_token' => $user->auth_token,
-        ])));
-
-        $response = $this->await($this->browser->post('http://127.0.0.1:8080/api/users', [
-            'Host' => 'expose.localhost',
-            'Authorization' => base64_encode('username:secret'),
-            'Content-Type' => 'application/json',
-        ], json_encode([
-            'name' => 'Sebastian',
-            'can_specify_subdomains' => 1,
-        ])));
-
-        $user = json_decode($response->getBody()->getContents())->user;
-
-        $this->expectException(ResponseException::class);
-        $this->expectExceptionMessage('HTTP status code 422');
-
-        $this->await($this->browser->post('http://127.0.0.1:8080/api/subdomains', [
-            'Host' => 'expose.localhost',
-            'Authorization' => base64_encode('username:secret'),
-            'Content-Type' => 'application/json',
-        ], json_encode([
-            'subdomain' => 'reserved',
-            'auth_token' => $user->auth_token,
-        ])));
-
-        $response = $this->await($this->browser->get('http://127.0.0.1:8080/api/users/2', [
-            'Host' => 'expose.localhost',
-            'Authorization' => base64_encode('username:secret'),
-            'Content-Type' => 'application/json',
-        ]));
-
-        $body = json_decode($response->getBody()->getContents());
-        $subdomains = $body->subdomains;
-
-        $this->assertCount(0, $subdomains);
-    }
-
     /** @test */
     public function it_can_list_all_currently_connected_sites_from_all_users()
     {
diff --git a/tests/Feature/Server/TunnelTest.php b/tests/Feature/Server/TunnelTest.php
index 20b2fdc..9e5faa1 100644
--- a/tests/Feature/Server/TunnelTest.php
+++ b/tests/Feature/Server/TunnelTest.php
@@ -315,6 +315,50 @@ class TunnelTest extends TestCase
         $this->assertSame('reserved', $response->subdomain);
     }
 
+    /** @test */
+    public function it_allows_users_that_both_have_the_same_reserved_subdomain()
+    {
+        $this->app['config']['expose.admin.validate_auth_tokens'] = true;
+
+        $user = $this->createUser([
+            'name' => 'Marcel',
+            'can_specify_subdomains' => 1,
+        ]);
+
+        $response = $this->await($this->browser->post('http://127.0.0.1:8080/api/subdomains', [
+            'Host' => 'expose.localhost',
+            'Authorization' => base64_encode('username:secret'),
+            'Content-Type' => 'application/json',
+        ], json_encode([
+            'subdomain' => 'reserved',
+            'auth_token' => $user->auth_token,
+        ])));
+
+        $user = $this->createUser([
+            'name' => 'Test-User',
+            'can_specify_subdomains' => 1,
+        ]);
+
+        $response = $this->await($this->browser->post('http://127.0.0.1:8080/api/subdomains', [
+            'Host' => 'expose.localhost',
+            'Authorization' => base64_encode('username:secret'),
+            'Content-Type' => 'application/json',
+        ], json_encode([
+            'subdomain' => 'reserved',
+            'auth_token' => $user->auth_token,
+        ])));
+
+        $this->createTestHttpServer();
+        /**
+         * We create an expose client that connects to our server and shares
+         * the created test HTTP server.
+         */
+        $client = $this->createClient();
+        $response = $this->await($client->connectToServer('127.0.0.1:8085', 'reserved', null, $user->auth_token));
+
+        $this->assertSame('reserved', $response->subdomain);
+    }
+
     /** @test */
     public function it_rejects_users_that_want_to_use_a_reserved_subdomain_on_a_custom_domain()
     {