diff --git a/apps/dav/tests/unit/ServerTest.php b/apps/dav/tests/unit/ServerTest.php
index d502b24adc..58c77c1b0e 100644
--- a/apps/dav/tests/unit/ServerTest.php
+++ b/apps/dav/tests/unit/ServerTest.php
@@ -41,6 +41,8 @@ class ServerTest extends \Test\TestCase {
 	public function test() {
 		/** @var IRequest $r */
 		$r = $this->createMock(IRequest::class);
+		$r->method('getRequestUri')
+			->willReturn('/');
 		$s = new Server($r, '/');
 		$this->assertInstanceOf('OCA\DAV\Server', $s);
 	}
diff --git a/lib/private/AppFramework/Http/Request.php b/lib/private/AppFramework/Http/Request.php
index 975c4255d5..86ba884141 100644
--- a/lib/private/AppFramework/Http/Request.php
+++ b/lib/private/AppFramework/Http/Request.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 /**
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  *
@@ -87,8 +88,8 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 
 	protected $inputStream;
 	protected $content;
-	protected $items = array();
-	protected $allowedKeys = array(
+	protected $items = [];
+	protected $allowedKeys = [
 		'get',
 		'post',
 		'files',
@@ -99,7 +100,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		'parameters',
 		'method',
 		'requesttoken',
-	);
+	];
 	/** @var ISecureRandom */
 	protected $secureRandom;
 	/** @var IConfig */
@@ -131,13 +132,13 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $stream
 	 * @see http://www.php.net/manual/en/reserved.variables.php
 	 */
-	public function __construct(array $vars=array(),
+	public function __construct(array $vars= [],
 								ISecureRandom $secureRandom = null,
 								IConfig $config,
 								CsrfTokenManager $csrfTokenManager = null,
-								$stream = 'php://input') {
+								string $stream = 'php://input') {
 		$this->inputStream = $stream;
-		$this->items['params'] = array();
+		$this->items['params'] = [];
 		$this->secureRandom = $secureRandom;
 		$this->config = $config;
 		$this->csrfTokenManager = $csrfTokenManager;
@@ -149,7 +150,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		foreach($this->allowedKeys as $name) {
 			$this->items[$name] = isset($vars[$name])
 				? $vars[$name]
-				: array();
+				: [];
 		}
 
 		$this->items['parameters'] = array_merge(
@@ -175,8 +176,8 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * Countable method
 	 * @return int
 	 */
-	public function count() {
-		return count(array_keys($this->items['parameters']));
+	public function count(): int {
+		return \count($this->items['parameters']);
 	}
 
 	/**
@@ -199,13 +200,15 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	* @param string $offset The key to lookup
 	* @return boolean
 	*/
-	public function offsetExists($offset) {
+	public function offsetExists($offset): bool {
 		return isset($this->items['parameters'][$offset]);
 	}
 
 	/**
-	* @see offsetExists
-	*/
+	 * @see offsetExists
+	 * @param string $offset
+	 * @return mixed
+	 */
 	public function offsetGet($offset) {
 		return isset($this->items['parameters'][$offset])
 			? $this->items['parameters'][$offset]
@@ -213,15 +216,18 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	}
 
 	/**
-	* @see offsetExists
-	*/
+	 * @see offsetExists
+	 * @param string $offset
+	 * @param mixed $value
+	 */
 	public function offsetSet($offset, $value) {
 		throw new \RuntimeException('You cannot change the contents of the request object');
 	}
 
 	/**
-	* @see offsetExists
-	*/
+	 * @see offsetExists
+	 * @param string $offset
+	 */
 	public function offsetUnset($offset) {
 		throw new \RuntimeException('You cannot change the contents of the request object');
 	}
@@ -284,7 +290,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @return bool
 	 */
 	public function __isset($name) {
-		if (in_array($name, $this->allowedKeys, true)) {
+		if (\in_array($name, $this->allowedKeys, true)) {
 			return true;
 		}
 		return isset($this->items['parameters'][$name]);
@@ -305,9 +311,9 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $name
 	 * @return string
 	 */
-	public function getHeader($name) {
+	public function getHeader(string $name): string {
 
-		$name = strtoupper(str_replace(array('-'),array('_'),$name));
+		$name = strtoupper(str_replace('-', '_',$name));
 		if (isset($this->server['HTTP_' . $name])) {
 			return $this->server['HTTP_' . $name];
 		}
@@ -340,7 +346,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param mixed $default If the key is not found, this value will be returned
 	 * @return mixed the content of the array
 	 */
-	public function getParam($key, $default = null) {
+	public function getParam(string $key, $default = null) {
 		return isset($this->parameters[$key])
 			? $this->parameters[$key]
 			: $default;
@@ -351,7 +357,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * (as GET or POST) or throuh the URL by the route
 	 * @return array the array with all parameters
 	 */
-	public function getParams() {
+	public function getParams(): array {
 		return $this->parameters;
 	}
 
@@ -359,7 +365,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * Returns the method of the request
 	 * @return string the method of the request (POST, GET, etc)
 	 */
-	public function getMethod() {
+	public function getMethod(): string {
 		return $this->method;
 	}
 
@@ -368,7 +374,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $key the key that will be taken from the $_FILES array
 	 * @return array the file in the $_FILES element
 	 */
-	public function getUploadedFile($key) {
+	public function getUploadedFile(string $key) {
 		return isset($this->files[$key]) ? $this->files[$key] : null;
 	}
 
@@ -377,7 +383,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $key the key that will be taken from the $_ENV array
 	 * @return array the value in the $_ENV element
 	 */
-	public function getEnv($key) {
+	public function getEnv(string $key) {
 		return isset($this->env[$key]) ? $this->env[$key] : null;
 	}
 
@@ -386,7 +392,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $key the key that will be taken from the $_COOKIE array
 	 * @return string the value in the $_COOKIE element
 	 */
-	public function getCookie($key) {
+	public function getCookie(string $key) {
 		return isset($this->cookies[$key]) ? $this->cookies[$key] : null;
 	}
 
@@ -435,7 +441,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		// 'application/json' must be decoded manually.
 		if (strpos($this->getHeader('Content-Type'), 'application/json') !== false) {
 			$params = json_decode(file_get_contents($this->inputStream), true);
-			if($params !== null && count($params) > 0) {
+			if($params !== null && \count($params) > 0) {
 				$this->items['params'] = $params;
 				if($this->method === 'POST') {
 					$this->items['post'] = $params;
@@ -449,12 +455,12 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 				&& strpos($this->getHeader('Content-Type'), 'application/x-www-form-urlencoded') !== false) {
 
 			parse_str(file_get_contents($this->inputStream), $params);
-			if(is_array($params)) {
+			if(\is_array($params)) {
 				$this->items['params'] = $params;
 			}
 		}
 
-		if (is_array($params)) {
+		if (\is_array($params)) {
 			$this->items['parameters'] = array_merge($this->items['parameters'], $params);
 		}
 		$this->contentDecoded = true;
@@ -465,7 +471,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * Checks if the CSRF check was correct
 	 * @return bool true if CSRF check passed
 	 */
-	public function passesCSRFCheck() {
+	public function passesCSRFCheck(): bool {
 		if($this->csrfTokenManager === null) {
 			return false;
 		}
@@ -494,7 +500,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 *
 	 * @return bool
 	 */
-	private function cookieCheckRequired() {
+	private function cookieCheckRequired(): bool {
 		if ($this->getHeader('OCS-APIREQUEST')) {
 			return false;
 		}
@@ -510,7 +516,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 *
 	 * @return array
 	 */
-	public function getCookieParams() {
+	public function getCookieParams(): array {
 		return session_get_cookie_params();
 	}
 
@@ -520,7 +526,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $name
 	 * @return string
 	 */
-	protected function getProtectedCookieName($name) {
+	protected function getProtectedCookieName(string $name): string {
 		$cookieParams = $this->getCookieParams();
 		$prefix = '';
 		if($cookieParams['secure'] === true && $cookieParams['path'] === '/') {
@@ -537,7 +543,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @return bool
 	 * @since 9.1.0
 	 */
-	public function passesStrictCookieCheck() {
+	public function passesStrictCookieCheck(): bool {
 		if(!$this->cookieCheckRequired()) {
 			return true;
 		}
@@ -557,7 +563,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @return bool
 	 * @since 9.1.0
 	 */
-	public function passesLaxCookieCheck() {
+	public function passesLaxCookieCheck(): bool {
 		if(!$this->cookieCheckRequired()) {
 			return true;
 		}
@@ -575,7 +581,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * If `mod_unique_id` is installed this value will be taken.
 	 * @return string
 	 */
-	public function getId() {
+	public function getId(): string {
 		if(isset($this->server['UNIQUE_ID'])) {
 			return $this->server['UNIQUE_ID'];
 		}
@@ -595,11 +601,11 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * Do always use this instead of $_SERVER['REMOTE_ADDR']
 	 * @return string IP address
 	 */
-	public function getRemoteAddress() {
+	public function getRemoteAddress(): string {
 		$remoteAddress = isset($this->server['REMOTE_ADDR']) ? $this->server['REMOTE_ADDR'] : '';
 		$trustedProxies = $this->config->getSystemValue('trusted_proxies', []);
 
-		if(is_array($trustedProxies) && in_array($remoteAddress, $trustedProxies)) {
+		if(\is_array($trustedProxies) && \in_array($remoteAddress, $trustedProxies)) {
 			$forwardedForHeaders = $this->config->getSystemValue('forwarded_for_headers', [
 				'HTTP_X_FORWARDED_FOR'
 				// only have one default, so we cannot ship an insecure product out of the box
@@ -625,7 +631,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param string $type
 	 * @return bool
 	 */
-	private function isOverwriteCondition($type = '') {
+	private function isOverwriteCondition(string $type = ''): bool {
 		$regex = '/' . $this->config->getSystemValue('overwritecondaddr', '')  . '/';
 		$remoteAddr = isset($this->server['REMOTE_ADDR']) ? $this->server['REMOTE_ADDR'] : '';
 		return $regex === '//' || preg_match($regex, $remoteAddr) === 1
@@ -637,7 +643,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * and load balancers
 	 * @return string Server protocol (http or https)
 	 */
-	public function getServerProtocol() {
+	public function getServerProtocol(): string {
 		if($this->config->getSystemValue('overwriteprotocol') !== ''
 			&& $this->isOverwriteCondition('protocol')) {
 			return $this->config->getSystemValue('overwriteprotocol');
@@ -671,8 +677,12 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 *
 	 * @return string HTTP protocol. HTTP/2, HTTP/1.1 or HTTP/1.0.
 	 */
-	public function getHttpProtocol() {
-		$claimedProtocol = strtoupper($this->server['SERVER_PROTOCOL']);
+	public function getHttpProtocol(): string {
+		$claimedProtocol = $this->server['SERVER_PROTOCOL'];
+
+		if (\is_string($claimedProtocol)) {
+			$claimedProtocol = strtoupper($claimedProtocol);
+		}
 
 		$validProtocols = [
 			'HTTP/1.0',
@@ -680,7 +690,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 			'HTTP/2',
 		];
 
-		if(in_array($claimedProtocol, $validProtocols, true)) {
+		if(\in_array($claimedProtocol, $validProtocols, true)) {
 			return $claimedProtocol;
 		}
 
@@ -692,10 +702,10 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * reverse proxies
 	 * @return string
 	 */
-	public function getRequestUri() {
+	public function getRequestUri(): string {
 		$uri = isset($this->server['REQUEST_URI']) ? $this->server['REQUEST_URI'] : '';
 		if($this->config->getSystemValue('overwritewebroot') !== '' && $this->isOverwriteCondition()) {
-			$uri = $this->getScriptName() . substr($uri, strlen($this->server['SCRIPT_NAME']));
+			$uri = $this->getScriptName() . substr($uri, \strlen($this->server['SCRIPT_NAME']));
 		}
 		return $uri;
 	}
@@ -705,7 +715,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @throws \Exception
 	 * @return string Path info
 	 */
-	public function getRawPathInfo() {
+	public function getRawPathInfo(): string {
 		$requestUri = isset($this->server['REQUEST_URI']) ? $this->server['REQUEST_URI'] : '';
 		// remove too many leading slashes - can be caused by reverse proxy configuration
 		if (strpos($requestUri, '/') === 0) {
@@ -727,16 +737,20 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		list($path, $name) = \Sabre\Uri\split($scriptName);
 		if (!empty($path)) {
 			if($path === $pathInfo || strpos($pathInfo, $path.'/') === 0) {
-				$pathInfo = substr($pathInfo, strlen($path));
+				$pathInfo = substr($pathInfo, \strlen($path));
 			} else {
 				throw new \Exception("The requested uri($requestUri) cannot be processed by the script '$scriptName')");
 			}
 		}
-		if (strpos($pathInfo, '/'.$name) === 0) {
-			$pathInfo = substr($pathInfo, strlen($name) + 1);
+		if ($name === null) {
+			$name = '';
 		}
-		if (strpos($pathInfo, $name) === 0) {
-			$pathInfo = substr($pathInfo, strlen($name));
+
+		if (strpos($pathInfo, '/'.$name) === 0) {
+			$pathInfo = substr($pathInfo, \strlen($name) + 1);
+		}
+		if ($name !== '' && strpos($pathInfo, $name) === 0) {
+			$pathInfo = substr($pathInfo, \strlen($name));
 		}
 		if($pathInfo === false || $pathInfo === '/'){
 			return '';
@@ -770,13 +784,13 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * reverse proxies
 	 * @return string the script name
 	 */
-	public function getScriptName() {
+	public function getScriptName(): string {
 		$name = $this->server['SCRIPT_NAME'];
 		$overwriteWebRoot =  $this->config->getSystemValue('overwritewebroot');
 		if ($overwriteWebRoot !== '' && $this->isOverwriteCondition()) {
 			// FIXME: This code is untestable due to __DIR__, also that hardcoded path is really dangerous
-			$serverRoot = str_replace('\\', '/', substr(__DIR__, 0, -strlen('lib/private/appframework/http/')));
-			$suburi = str_replace('\\', '/', substr(realpath($this->server['SCRIPT_FILENAME']), strlen($serverRoot)));
+			$serverRoot = str_replace('\\', '/', substr(__DIR__, 0, -\strlen('lib/private/appframework/http/')));
+			$suburi = str_replace('\\', '/', substr(realpath($this->server['SCRIPT_FILENAME']), \strlen($serverRoot)));
 			$name = '/' . ltrim($overwriteWebRoot . $suburi, '/');
 		}
 		return $name;
@@ -787,7 +801,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * @param array $agent array of agent names
 	 * @return bool true if at least one of the given agent matches, false otherwise
 	 */
-	public function isUserAgent(array $agent) {
+	public function isUserAgent(array $agent): bool {
 		if (!isset($this->server['HTTP_USER_AGENT'])) {
 			return false;
 		}
@@ -804,7 +818,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * whether it is a trusted domain
 	 * @return string Server host
 	 */
-	public function getInsecureServerHost() {
+	public function getInsecureServerHost(): string {
 		$host = 'localhost';
 		if (isset($this->server['HTTP_X_FORWARDED_HOST'])) {
 			if (strpos($this->server['HTTP_X_FORWARDED_HOST'], ',') !== false) {
@@ -829,7 +843,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 	 * trusted domain if the host isn't in the trusted list
 	 * @return string Server host
 	 */
-	public function getServerHost() {
+	public function getServerHost(): string {
 		// overwritehost is always trusted
 		$host = $this->getOverwriteHost();
 		if ($host !== null) {
diff --git a/lib/private/Server.php b/lib/private/Server.php
index 228f0ab5f9..d586bab15b 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -814,7 +814,7 @@ class Server extends ServerContainer implements IServerContainer {
 					'cookies' => $_COOKIE,
 					'method' => (isset($_SERVER) && isset($_SERVER['REQUEST_METHOD']))
 						? $_SERVER['REQUEST_METHOD']
-						: null,
+						: '',
 					'urlParams' => $urlParams,
 				],
 				$this->getSecureRandom(),
diff --git a/lib/public/IRequest.php b/lib/public/IRequest.php
index a14b6b5f45..b313020711 100644
--- a/lib/public/IRequest.php
+++ b/lib/public/IRequest.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 /**
  * @copyright Copyright (c) 2016, ownCloud, Inc.
  *
@@ -95,7 +96,7 @@ interface IRequest {
 	 * @return string
 	 * @since 6.0.0
 	 */
-	public function getHeader($name);
+	public function getHeader(string $name): string;
 
 	/**
 	 * Lets you access post and get parameters by the index
@@ -111,7 +112,7 @@ interface IRequest {
 	 * @return mixed the content of the array
 	 * @since 6.0.0
 	 */
-	public function getParam($key, $default = null);
+	public function getParam(string $key, $default = null);
 
 
 	/**
@@ -122,7 +123,7 @@ interface IRequest {
 	 * @return array the array with all parameters
 	 * @since 6.0.0
 	 */
-	public function getParams();
+	public function getParams(): array;
 
 	/**
 	 * Returns the method of the request
@@ -130,7 +131,7 @@ interface IRequest {
 	 * @return string the method of the request (POST, GET, etc)
 	 * @since 6.0.0
 	 */
-	public function getMethod();
+	public function getMethod(): string;
 
 	/**
 	 * Shortcut for accessing an uploaded file through the $_FILES array
@@ -139,7 +140,7 @@ interface IRequest {
 	 * @return array the file in the $_FILES element
 	 * @since 6.0.0
 	 */
-	public function getUploadedFile($key);
+	public function getUploadedFile(string $key);
 
 
 	/**
@@ -149,7 +150,7 @@ interface IRequest {
 	 * @return array the value in the $_ENV element
 	 * @since 6.0.0
 	 */
-	public function getEnv($key);
+	public function getEnv(string $key);
 
 
 	/**
@@ -159,7 +160,7 @@ interface IRequest {
 	 * @return string|null the value in the $_COOKIE element
 	 * @since 6.0.0
 	 */
-	public function getCookie($key);
+	public function getCookie(string $key);
 
 
 	/**
@@ -168,7 +169,7 @@ interface IRequest {
 	 * @return bool true if CSRF check passed
 	 * @since 6.0.0
 	 */
-	public function passesCSRFCheck();
+	public function passesCSRFCheck(): bool;
 
 	/**
 	 * Checks if the strict cookie has been sent with the request if the request
@@ -177,7 +178,7 @@ interface IRequest {
 	 * @return bool
 	 * @since 9.0.0
 	 */
-	public function passesStrictCookieCheck();
+	public function passesStrictCookieCheck(): bool;
 
 	/**
 	 * Checks if the lax cookie has been sent with the request if the request
@@ -186,7 +187,7 @@ interface IRequest {
 	 * @return bool
 	 * @since 9.0.0
 	 */
-	public function passesLaxCookieCheck();
+	public function passesLaxCookieCheck(): bool;
 
 	/**
 	 * Returns an ID for the request, value is not guaranteed to be unique and is mostly meant for logging
@@ -195,7 +196,7 @@ interface IRequest {
 	 * @return string
 	 * @since 8.1.0
 	 */
-	public function getId();
+	public function getId(): string;
 
 	/**
 	 * Returns the remote address, if the connection came from a trusted proxy
@@ -206,7 +207,7 @@ interface IRequest {
 	 * @return string IP address
 	 * @since 8.1.0
 	 */
-	public function getRemoteAddress();
+	public function getRemoteAddress(): string;
 
 	/**
 	 * Returns the server protocol. It respects reverse proxy servers and load
@@ -215,7 +216,7 @@ interface IRequest {
 	 * @return string Server protocol (http or https)
 	 * @since 8.1.0
 	 */
-	public function getServerProtocol();
+	public function getServerProtocol(): string;
 
 	/**
 	 * Returns the used HTTP protocol.
@@ -223,7 +224,7 @@ interface IRequest {
 	 * @return string HTTP protocol. HTTP/2, HTTP/1.1 or HTTP/1.0.
 	 * @since 8.2.0
 	 */
-	public function getHttpProtocol();
+	public function getHttpProtocol(): string;
 
 	/**
 	 * Returns the request uri, even if the website uses one or more
@@ -232,7 +233,7 @@ interface IRequest {
 	 * @return string
 	 * @since 8.1.0
 	 */
-	public function getRequestUri();
+	public function getRequestUri(): string;
 
 	/**
 	 * Get raw PathInfo from request (not urldecoded)
@@ -241,7 +242,7 @@ interface IRequest {
 	 * @return string Path info
 	 * @since 8.1.0
 	 */
-	public function getRawPathInfo();
+	public function getRawPathInfo(): string;
 
 	/**
 	 * Get PathInfo from request
@@ -259,7 +260,7 @@ interface IRequest {
 	 * @return string the script name
 	 * @since 8.1.0
 	 */
-	public function getScriptName();
+	public function getScriptName(): string;
 
 	/**
 	 * Checks whether the user agent matches a given regex
@@ -268,7 +269,7 @@ interface IRequest {
 	 * @return bool true if at least one of the given agent matches, false otherwise
 	 * @since 8.1.0
 	 */
-	public function isUserAgent(array $agent);
+	public function isUserAgent(array $agent): bool;
 
 	/**
 	 * Returns the unverified server host from the headers without checking
@@ -277,7 +278,7 @@ interface IRequest {
 	 * @return string Server host
 	 * @since 8.1.0
 	 */
-	public function getInsecureServerHost();
+	public function getInsecureServerHost(): string;
 
 	/**
 	 * Returns the server host from the headers, or the first configured
@@ -286,5 +287,5 @@ interface IRequest {
 	 * @return string Server host
 	 * @since 8.1.0
 	 */
-	public function getServerHost();
+	public function getServerHost(): string;
 }
diff --git a/tests/lib/AppFramework/Http/RequestTest.php b/tests/lib/AppFramework/Http/RequestTest.php
index cc55e33f35..c6b9719b32 100644
--- a/tests/lib/AppFramework/Http/RequestTest.php
+++ b/tests/lib/AppFramework/Http/RequestTest.php
@@ -307,7 +307,7 @@ class RequestTest extends \Test\TestCase {
 			'method' => 'PUT',
 			'server' => [
 				'CONTENT_TYPE' => 'image/png',
-				'CONTENT_LENGTH' => strlen($data)
+				'CONTENT_LENGTH' => (string)strlen($data)
 			],
 		);