diff --git a/examples/09-stream-request.php b/examples/09-stream-request.php
index af4fb580..07cd21ed 100644
--- a/examples/09-stream-request.php
+++ b/examples/09-stream-request.php
@@ -16,11 +16,12 @@
 $server = new StreamingServer(function (ServerRequestInterface $request) {
     return new Promise(function ($resolve, $reject) use ($request) {
         $contentLength = 0;
-        $request->getBody()->on('data', function ($data) use (&$contentLength) {
+        $requestBody = $request->getBody();
+        $requestBody->on('data', function ($data) use (&$contentLength) {
             $contentLength += strlen($data);
         });
 
-        $request->getBody()->on('end', function () use ($resolve, &$contentLength){
+        $requestBody->on('end', function () use ($resolve, &$contentLength){
             $response = new Response(
                 200,
                 array(
@@ -32,7 +33,7 @@
         });
 
         // an error occures e.g. on invalid chunked encoded data or an unexpected 'end' event
-        $request->getBody()->on('error', function (\Exception $exception) use ($resolve, &$contentLength) {
+        $requestBody->on('error', function (\Exception $exception) use ($resolve, &$contentLength) {
             $response = new Response(
                 400,
                 array(
diff --git a/src/Io/ChunkedEncoder.php b/src/Io/ChunkedEncoder.php
index c075bdbc..8a7f8cfb 100644
--- a/src/Io/ChunkedEncoder.php
+++ b/src/Io/ChunkedEncoder.php
@@ -101,8 +101,7 @@ public function handleEnd()
      */
     private function createChunk($data)
     {
-        $byteSize = strlen($data);
-        $byteSize = dechex($byteSize);
+        $byteSize = dechex(strlen($data));
         $chunkBeginning = $byteSize . "\r\n";
 
         return $chunkBeginning . $data . "\r\n";
diff --git a/src/Io/RequestHeaderParser.php b/src/Io/RequestHeaderParser.php
index 21d2d322..23183fe5 100644
--- a/src/Io/RequestHeaderParser.php
+++ b/src/Io/RequestHeaderParser.php
@@ -70,10 +70,10 @@ private function parseRequest($headers)
         // parser does not support asterisk-form and authority-form
         // remember original target and temporarily replace and re-apply below
         $originalTarget = null;
-        if (strpos($headers, 'OPTIONS * ') === 0) {
+        if (strncmp($headers, 'OPTIONS * ', 10) === 0) {
             $originalTarget = '*';
             $headers = 'OPTIONS / ' . substr($headers, 10);
-        } elseif (strpos($headers, 'CONNECT ') === 0) {
+        } elseif (strncmp($headers, 'CONNECT ', 8) === 0) {
             $parts = explode(' ', $headers, 3);
             $uri = parse_url('tcp://' . $parts[1]);
 
diff --git a/src/Server.php b/src/Server.php
index 999409b3..d413bddf 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -102,8 +102,7 @@ private function getConcurrentRequestsLimit()
         }
 
         $availableMemory = IniUtil::iniSizeToBytes(ini_get('memory_limit')) / 4;
-        $concurrentRequests = $availableMemory / IniUtil::iniSizeToBytes(ini_get('post_max_size'));
-        $concurrentRequests = ceil($concurrentRequests);
+        $concurrentRequests = ceil($availableMemory / IniUtil::iniSizeToBytes(ini_get('post_max_size')));
 
         if ($concurrentRequests >= self::MAXIMUM_CONCURRENT_REQUESTS) {
             return self::MAXIMUM_CONCURRENT_REQUESTS;