diff --git a/src/Connection/TcpConnection.php b/src/Connection/TcpConnection.php
index 35654099f..29367918d 100644
--- a/src/Connection/TcpConnection.php
+++ b/src/Connection/TcpConnection.php
@@ -102,6 +102,20 @@ class TcpConnection extends ConnectionInterface implements JsonSerializable
      */
     public const STATUS_CLOSED = 8;
 
+    /**
+     * Maximum string length for cache
+     *
+     * @var int
+     */
+    public const MAX_CACHE_STRING_LENGTH = 2048;
+
+    /**
+     * Maximum cache size.
+     *
+     * @var int
+     */
+    public const MAX_CACHE_SIZE = 512;
+
     /**
      * Emitted when socket connection is successfully established.
      *
@@ -635,7 +649,7 @@ public function baseRead($socket, bool $checkEof = true): void
         } else {
             $this->bytesRead += strlen($buffer);
             if ($this->recvBuffer === '') {
-                if (static::$enableCache && !isset($buffer[512]) && isset($requests[$buffer])) {
+                if (static::$enableCache && isset($requests[$buffer])) {
                     ++self::$statistics['total_request'];
                     $request = $requests[$buffer];
                     if ($request instanceof Request) {
@@ -710,9 +724,9 @@ public function baseRead($socket, bool $checkEof = true): void
                     /** @var ProtocolInterface $parser */
                     $parser = $this->protocol;
                     $request = $parser::decode($oneRequestBuffer, $this);
-                    if (static::$enableCache && (!is_object($request) || $request instanceof Request) && $one && !isset($oneRequestBuffer[512])) {
+                    if (static::$enableCache && (!is_object($request) || $request instanceof Request) && $one && !isset($oneRequestBuffer[static::MAX_CACHE_STRING_LENGTH])) {
                         $requests[$oneRequestBuffer] = $request;
-                        if (count($requests) > 512) {
+                        if (count($requests) > static::MAX_CACHE_SIZE) {
                             unset($requests[key($requests)]);
                         }
                     }
diff --git a/src/Protocols/Http.php b/src/Protocols/Http.php
index c528ee08b..5eb3f0954 100644
--- a/src/Protocols/Http.php
+++ b/src/Protocols/Http.php
@@ -102,7 +102,7 @@ public static function enableCache(bool $value)
     public static function input(string $buffer, TcpConnection $connection): int
     {
         static $input = [];
-        if (!isset($buffer[512]) && isset($input[$buffer])) {
+        if (isset($input[$buffer])) {
             return $input[$buffer];
         }
         $crlfPos = strpos($buffer, "\r\n\r\n");
@@ -148,9 +148,9 @@ public static function input(string $buffer, TcpConnection $connection): int
             return 0;
         }
 
-        if (!isset($buffer[512])) {
+        if (!isset($buffer[TcpConnection::MAX_CACHE_STRING_LENGTH])) {
             $input[$buffer] = $length;
-            if (count($input) > 512) {
+            if (count($input) > TcpConnection::MAX_CACHE_SIZE) {
                 unset($input[key($input)]);
             }
         }
@@ -168,8 +168,8 @@ public static function input(string $buffer, TcpConnection $connection): int
     public static function decode(string $buffer, TcpConnection $connection): Request
     {
         static $requests = [];
-        $cacheable = static::$enableCache && !isset($buffer[512]);
-        if (true === $cacheable && isset($requests[$buffer])) {
+        $cacheable = static::$enableCache && !isset($buffer[TcpConnection::MAX_CACHE_STRING_LENGTH]);
+        if (isset($requests[$buffer])) {
             $request = clone $requests[$buffer];
             $request->connection = $connection;
             $connection->request = $request;
@@ -181,7 +181,7 @@ public static function decode(string $buffer, TcpConnection $connection): Reques
         $connection->request = $request;
         if (true === $cacheable) {
             $requests[$buffer] = $request;
-            if (count($requests) > 512) {
+            if (count($requests) > TcpConnection::MAX_CACHE_SIZE) {
                 unset($requests[key($requests)]);
             }
         }