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index def19cb..627107e 100644
--- a/composer.json
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diff --git a/composer.lock b/composer.lock
index 23c678b..0c8a8b5 100644
--- a/composer.lock
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             "funding": [
                 {
@@ -3544,7 +3533,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2026-03-10T15:06:19+00:00"
+            "time": "2026-06-27T08:12:01+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/src/BaseRouter.php b/src/BaseRouter.php
index 83a4ac1..13009e2 100644
--- a/src/BaseRouter.php
+++ b/src/BaseRouter.php
@@ -5,7 +5,6 @@
 use Gt\Http\ResponseStatusException\ClientError\HttpNotAcceptable;
 use Gt\ServiceContainer\Container;
 use Gt\ServiceContainer\Injector;
-use Negotiation\Accept;
 use Psr\Http\Message\RequestInterface;
 use Gt\Http\ResponseStatusException\Redirection\HttpFound;
 use Gt\Http\ResponseStatusException\Redirection\HttpMovedPermanently;
@@ -103,11 +102,9 @@ private function findRedirectTarget(Redirects $redirects, string $uri):?string {
 	}
 
 	public function route(RequestInterface $request):void {
-		/** @var array<RouterCallback> $validCallbackArray */
-		$validCallbackArray = [];
-		$acceptHeader = $this->getEffectiveAcceptHeader(
-			$request->getHeaderLine("accept")
-		);
+		$acceptHeader = $request->getHeaderLine("accept");
+		/** @var array<RouterCallback> $routeMatchingCallbackArray */
+		$routeMatchingCallbackArray = [];
 // Find all callbacks that match the current request, filling the valid callback
 // array. Then, the "best" callback will be matched using content negotiation.
 		foreach($this->reflectRouterCallbacks() as $routerCallback) {
@@ -117,16 +114,13 @@ public function route(RequestInterface $request):void {
 			if(!$routerCallback->matchesPath($request->getUri()->getPath())) {
 				continue;
 			}
-			if(!$routerCallback->matchesAccept($acceptHeader)) {
-				continue;
-			}
-
-			array_push($validCallbackArray, $routerCallback);
+			array_push($routeMatchingCallbackArray, $routerCallback);
 		}
 
-		$bestRouterCallback = $this->negotiateBestCallback(
+		$contentTypeNegotiator = new ContentTypeNegotiator($this->config);
+		$bestRouterCallback = $contentTypeNegotiator->negotiate(
 			$acceptHeader,
-			$validCallbackArray
+			$routeMatchingCallbackArray
 		);
 
 		if(!$bestRouterCallback) {
@@ -225,52 +219,4 @@ private function reflectRouterCallbacks():array {
 		return $routerCallbackArray;
 	}
 
-	/** @param array<RouterCallback> $callbackArray */
-	private function negotiateBestCallback(
-		string $acceptHeader,
-		array $callbackArray
-	):?RouterCallback {
-		$bestQuality = -1;
-		$bestCallback = null;
-		foreach($callbackArray as $callback) {
-			/** @var Accept|null $best */
-			$best = $callback->getBestNegotiation(
-				$acceptHeader
-			);
-
-			$quality = $best?->getQuality() ?? 0;
-			if($quality <= $bestQuality) {
-				continue;
-			}
-
-			$bestQuality = $quality;
-			$bestCallback = $callback;
-		}
-
-		return $bestCallback;
-	}
-
-	private function getEffectiveAcceptHeader(string $acceptHeader):string {
-		if(!$this->isWildcardOnlyAcceptHeader($acceptHeader)) {
-			return $acceptHeader;
-		}
-
-		return $this->config?->defaultContentType ?? $acceptHeader;
-	}
-
-	private function isWildcardOnlyAcceptHeader(string $acceptHeader):bool {
-		$acceptHeader = trim($acceptHeader);
-		if($acceptHeader === "") {
-			return true;
-		}
-
-		foreach(explode(",", $acceptHeader) as $acceptPart) {
-			$mediaType = trim(explode(";", $acceptPart, 2)[0]);
-			if($mediaType !== "*/*") {
-				return false;
-			}
-		}
-
-		return true;
-	}
 }
diff --git a/src/ContentTypeNegotiator.php b/src/ContentTypeNegotiator.php
new file mode 100644
index 0000000..e7541c1
--- /dev/null
+++ b/src/ContentTypeNegotiator.php
@@ -0,0 +1,141 @@
+<?php
+namespace GT\Routing;
+
+use Negotiation\Accept;
+use Negotiation\BaseAccept;
+use Negotiation\Negotiator;
+
+class ContentTypeNegotiator {
+	public function __construct(private readonly ?RouterConfig $config) {}
+
+	/**
+	 * @param array<RouterCallback> $callbackArray
+	 */
+	public function negotiate(
+		string $acceptHeader,
+		array $callbackArray
+	):?RouterCallback {
+		if($this->isWildcardOnlyAcceptHeader($acceptHeader)) {
+			return $this->negotiateBestCallback(
+				$this->getDefaultContentType($acceptHeader),
+				$callbackArray
+			)[0] ?? null;
+		}
+
+		$bestNegotiation = $this->negotiateBestCallback(
+			$acceptHeader,
+			$callbackArray
+		);
+
+		if($this->isLooseAcceptHeader($acceptHeader)) {
+			$defaultContentType = $this->negotiateDefaultContentType(
+				$acceptHeader
+			);
+			if($defaultContentType
+			&& $defaultContentType->getQuality() >= ($bestNegotiation[1]?->getQuality() ?? 0)) {
+				$defaultNegotiation = $this->negotiateBestCallback(
+					$defaultContentType->getType(),
+					$callbackArray
+				);
+				if($defaultNegotiation) {
+					return $defaultNegotiation[0];
+				}
+			}
+		}
+
+		if($bestNegotiation) {
+			return $bestNegotiation[0];
+		}
+
+		return null;
+	}
+
+	/**
+	 * @param array<RouterCallback> $callbackArray
+	 * @return null|array{RouterCallback, ?Accept}
+	 */
+	private function negotiateBestCallback(
+		string $acceptHeader,
+		array $callbackArray
+	):?array {
+		$bestQuality = -1;
+		$bestCallback = null;
+		$bestNegotiation = null;
+		foreach($callbackArray as $callback) {
+			if(!$callback->matchesAccept($acceptHeader)) {
+				continue;
+			}
+
+			$best = $callback->getBestNegotiation($acceptHeader);
+			$quality = $best?->getQuality() ?? 0;
+			if($quality <= $bestQuality) {
+				continue;
+			}
+
+			$bestQuality = $quality;
+			$bestCallback = $callback;
+			$bestNegotiation = $best;
+		}
+
+		if(!$bestCallback) {
+			return null;
+		}
+
+		return [$bestCallback, $bestNegotiation];
+	}
+
+	private function getDefaultContentType(string $acceptHeader):string {
+		return $this->config?->defaultContentType ?? $acceptHeader;
+	}
+
+	private function negotiateDefaultContentType(
+		string $acceptHeader
+	):?BaseAccept {
+		$defaultContentType = $this->config?->defaultContentType;
+		if(!$defaultContentType) {
+			return null;
+		}
+
+		$negotiator = new Negotiator();
+		$best = $negotiator->getBest(
+			$acceptHeader,
+			explode(",", $defaultContentType)
+		);
+		if(!$best instanceof BaseAccept) {
+			return null;
+		}
+
+		return $best;
+	}
+
+	private function isLooseAcceptHeader(string $acceptHeader):bool {
+		if($this->isWildcardOnlyAcceptHeader($acceptHeader)) {
+			return false;
+		}
+
+		foreach(explode(",", $acceptHeader) as $acceptPart) {
+			$mediaType = trim(explode(";", $acceptPart, 2)[0]);
+			if(str_contains($mediaType, "*")) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	private function isWildcardOnlyAcceptHeader(string $acceptHeader):bool {
+		$acceptHeader = trim($acceptHeader);
+		if($acceptHeader === "") {
+			return true;
+		}
+
+		foreach(explode(",", $acceptHeader) as $acceptPart) {
+			$mediaType = trim(explode(";", $acceptPart, 2)[0]);
+			if($mediaType !== "*/*") {
+				return false;
+			}
+		}
+
+		return true;
+	}
+}
diff --git a/test/phpunit/BaseRouterTest.php b/test/phpunit/BaseRouterTest.php
index 687ce52..2e6676a 100644
--- a/test/phpunit/BaseRouterTest.php
+++ b/test/phpunit/BaseRouterTest.php
@@ -342,6 +342,60 @@ public function thisShouldMatch():void {
 		$sut->route($request);
 	}
 
+	public function testRoute_failsWhenAcceptHasNoMatch():void {
+		$uri = self::createMock(Uri::class);
+		$uri->method("getPath")->willReturn("/something");
+		$request = self::createMock(Request::class);
+		$request->method("getUri")->willReturn($uri);
+		$request->method("getMethod")->willReturn("GET");
+		$request->method("getHeaderLine")
+			->with("accept")
+			->willReturn("application/yaml");
+
+		$sut = new class(new RouterConfig(307, "text/html")) extends BaseRouter {
+			/** @noinspection PhpUnused */
+			#[Any(path: "/something", accept: "text/html")]
+			public function thisShouldNotMatch():void {
+				throw new Exception("Route 1");
+			}
+
+			/** @noinspection PhpUnused */
+			#[Any(path: "/something", accept: "application/json")]
+			public function thisShouldMatch():void {
+				throw new Exception("Route 2");
+			}
+		};
+		self::expectException(HttpNotAcceptable::class);
+		$sut->route($request);
+	}
+
+	public function testRoute_usesDefaultContentTypeForLooseAccept():void {
+		$uri = self::createMock(Uri::class);
+		$uri->method("getPath")->willReturn("/something");
+		$request = self::createMock(Request::class);
+		$request->method("getUri")->willReturn($uri);
+		$request->method("getMethod")->willReturn("GET");
+		$request->method("getHeaderLine")
+			->with("accept")
+			->willReturn("text/*");
+
+		$sut = new class(new RouterConfig(307, "text/plain,text/html")) extends BaseRouter {
+			/** @noinspection PhpUnused */
+			#[Any(path: "/something", accept: "text/html")]
+			public function thisShouldNotMatch():void {
+				throw new Exception("Route 1");
+			}
+
+			/** @noinspection PhpUnused */
+			#[Any(path: "/something", accept: "text/plain")]
+			public function thisShouldMatch():void {
+				throw new Exception("Route 2");
+			}
+		};
+		self::expectExceptionMessage("Route 2");
+		$sut->route($request);
+	}
+
 	/** @dataProvider data_redirectCode */
 	public function testHandleRedirects_responseCodeFromConfig(
 		int $code,