fix header isValidKeyName #374

Author: lihsai0

src/Qiniu/Http/Header.php

@@ -264,7 +264,7 @@ public function count()
      */
     private static function isValidKeyName($str)
     {
-        for ($i = 0; $i < count($str); $i += 1) {
+        for ($i = 0; $i < strlen($str); $i += 1) {
             if (!isset(self::$isTokenTable[$str[$i]])) {
                 return false;
             }

tests/Qiniu/Tests/HeaderTest.php

@@ -40,6 +40,20 @@ public function testNormalizeKey()
         $this->assertEquals($actual, $except);
     }
 
+
+    public function testInvalidKeyName()
+    {
+        $except = array(
+            'a:x-test-1',
+        );
+
+        $actual = array_map(function ($str) {
+            return Header::normalizeKey($str);
+        }, $except);
+
+        $this->assertEquals($except, $actual);
+    }
+
     public function testGetRawData()
     {
         $header = new Header($this->heads);