改进Request类cache方法

library/think/Request.php

@@ -1476,6 +1476,7 @@ class Request
      */
     public function cache($key, $expire = null)
     {
+        if ($this->isGet()) {
             if (false !== strpos($key, ':')) {
                 $param = $this->param();
                 foreach ($param as $item => $val) {
@@ -1498,6 +1499,7 @@ class Request
                 $this->cache = [$key, $expire];
             }
         }
+    }
 
     /**
      * 读取缓存设置

library/think/Response.php

@@ -115,7 +115,7 @@ class Response
 
         if (200 == $this->code) {
             $cache = Request::instance()->getCache();
-            if ($cache && Request::instance()->isGet()) {
+            if ($cache) {
                 Cache::set($cache[0], $data, $cache[1]);
                 Cache::set($cache[0] . '_header', $this->header['Content-Type']);
             }