diff --git a/lib/drivers/seafile/seafile_api.php b/lib/drivers/seafile/seafile_api.php
--- a/lib/drivers/seafile/seafile_api.php
+++ b/lib/drivers/seafile/seafile_api.php
@@ -59,11 +59,11 @@
     protected $config = array();
 
     /**
-     * HTTP request handle
+     * HTTP client
      *
-     * @var HTTP_Request
+     * @var GuzzleHttp\Client
      */
-    protected $request;
+    protected $client = null;
 
     /**
      * Web API URI prefix
@@ -106,39 +106,6 @@
         $this->url_prefix = preg_replace('|^(https?://[^/]+).*$|i', '\\1', $this->url);
     }
 
-    /**
-     *
-     * @param array Configuration for this Request instance, that will be merged
-     *              with default configuration
-     *
-     * @return HTTP_Request2 Request object
-     */
-    public static function http_request($config = array())
-    {
-        // remove unknown config, otherwise HTTP_Request will throw an error
-        $config = array_intersect_key($config, array_flip(array(
-            'connect_timeout', 'timeout', 'use_brackets', 'protocol_version',
-            'buffer_size', 'store_body', 'follow_redirects', 'max_redirects',
-            'strict_redirects', 'ssl_verify_peer', 'ssl_verify_host',
-            'ssl_cafile', 'ssl_capath', 'ssl_local_cert', 'ssl_passphrase'
-        )));
-
-        // force CURL adapter, this allows to handle correctly
-        // compressed responses with simple SplObserver registered
-        $config['adapter'] = 'HTTP_Request2_Adapter_Curl';
-
-        try {
-            $request = new HTTP_Request2();
-            $request->setConfig($config);
-        }
-        catch (Exception $e) {
-            rcube::raise_error($e, true, false);
-            return;
-        }
-
-        return $request;
-    }
-
     /**
      * Send HTTP request
      *
@@ -166,29 +133,15 @@
             $url = str_replace('/api2/', "/api/v$version/", $url);
         }
 
-        if (!$this->request) {
-            $this->config['store_body']       = true;
-            // some methods respond with 301 redirect, we'll not follow them
-            // also because of https://github.com/haiwen/seahub/issues/288
-            $this->config['follow_redirects'] = false;
-
-            $this->request = self::http_request($this->config);
-
-            if (!$this->request) {
-                $this->status = self::CONNECTION_ERROR;
-                return;
-            }
-        }
-
-        // cleanup
-        try {
-            $this->request->setBody('');
-            $this->request->setUrl($url);
-        }
-        catch (Exception $e) {
-            rcube::raise_error($e, true, false);
-            $this->status = self::CONNECTION_ERROR;
-            return;
+        if (!$this->client) {
+            $this->client = new \GuzzleHttp\Client(
+                [
+                    'http_errors' => true,
+                    'verify' => false,
+                    'connect_timeout' => 10,
+                    'timeout' => 300,
+                ]
+            );
         }
 
         if ($this->config['debug']) {
@@ -210,49 +163,73 @@
             rcube::write_log('console', $log_line);
         }
 
-        $this->request->setMethod($method ?: HTTP_Request2::METHOD_GET);
-
-        if (!empty($get)) {
-            $_url = $this->request->getUrl();
-            $_url->setQueryVariables($get);
-            $this->request->setUrl($_url);
-        }
+        // send request to the SeaFile API server
+        try {
+            $headers = [
+                'Accept' => "application/json,text/javascript,*/*",
+                'User-Agent' => $_SERVER['HTTP_USER_AGENT']
+            ];
 
-        // HTTP_Request2 does not support POST params on PUT requests
-        if (!empty($post) && $method == 'PUT') {
-            $body = http_build_query($post, '', '&');
-            $body = str_replace('%7E', '~', $body); // support RFC 3986 by not encoding '~' symbol
-            $post = null;
+            if ($this->token) {
+                $headers['Authorization'] = "Token " . $this->token;
+            }
 
-            $this->request->setBody($body);
-            $this->request->setHeader('content-type', 'application/x-www-form-urlencoded');
-        }
+            $options = [];
 
-        if (!empty($post)) {
-            $this->request->addPostParameter($post);
-        }
 
-        if (!empty($upload)) {
-            foreach ($upload as $field_name => $file) {
-                $this->request->addUpload($field_name, $file['data'], $file['name'], $file['type']);
+            if (!empty($get)) {
+                $options['query'] = $get;
             }
-        }
-
-        if ($this->token) {
-            $this->request->setHeader('Authorization', "Token " . $this->token);
-        }
 
-        // some HTTP server configurations require this header
-        $this->request->setHeader('Accept', "application/json,text/javascript,*/*");
+            if (!empty($upload)) {
+                if (!empty($post['target_file'])) {
+                    $filename = basename($post['target_file']);
+                } else {
+                    $filename = $upload['file']['name'];
+                }
+                $multipart = [
+                    [
+                        'headers' => ['Content-Type' => 'application/octet-stream'],
+                        'name' => 'file',
+                        'filename' => $filename,
+                        'contents' => $upload['file']['data']
+                    ],
+                    [
+                        'name' => 'name',
+                        'contents' => $upload['file']['name'],
+                    ],
+                    [
+                        'name' => 'type',
+                        'contents' => $upload['file']['type'],
+                    ],
+                ];
+
+                if (array_key_exists('parent_dir', $post)) {
+                    $multipart[] = [
+                        'name' => 'parent_dir',
+                        'contents' => $post['parent_dir']
+                    ];
+                }
+                if (array_key_exists('target_file', $post)) {
+                    $multipart[] = [
+                        'name' => 'target_file',
+                        'contents' => $post['target_file']
+                    ];
+                }
+                $options['multipart'] = $multipart;
+            } else {
+                if (!empty($post)) {
+                    $options['form_params'] = $post;
+                }
+            }
 
-        // proxy User-Agent string
-        $this->request->setHeader('User-Agent', $_SERVER['HTTP_USER_AGENT']);
+            if (!empty($headers)) {
+                $options['headers'] = $headers;
+            }
+            $response = $this->client->request($method ?: "GET", $url, $options);
 
-        // send request to the SeaFile API server
-        try {
-            $response     = $this->request->send();
-            $this->status = $response->getStatus();
-            $body         = $response->getBody();
+            $this->status = $response->getStatusCode();
+            $body = $response->getBody();
         }
         catch (Exception $e) {
             rcube::raise_error($e, true, false);
diff --git a/lib/drivers/seafile/seafile_file_storage.php b/lib/drivers/seafile/seafile_file_storage.php
--- a/lib/drivers/seafile/seafile_file_storage.php
+++ b/lib/drivers/seafile/seafile_file_storage.php
@@ -379,9 +379,6 @@
 
         $created = $this->api->file_upload($repo_id, $fn, $file);
 
-        if ($fp) {
-            fclose($fp);
-        }
 
         if (!$created) {
             rcube::raise_error(array(
@@ -425,9 +422,6 @@
 
         $saved = $this->api->file_update($repo_id, $fn, $file);
 
-        if ($fp) {
-            fclose($fp);
-        }
 
         if (!$saved) {
             rcube::raise_error(array(
@@ -542,7 +536,6 @@
             }
             else if ($fp = fopen('php://output', 'wb')) {
                 $this->save_file_content($link, $fp);
-                fclose($fp);
             }
         }
     }
@@ -1645,9 +1638,24 @@
         }
 
         $config  = array_merge($this->config, array('store_bodies' => true));
-        $request = seafile_api::http_request($config);
 
-        if (!$request) {
+        $config = array_intersect_key($config, array_flip(array(
+            'connect_timeout', 'timeout', 'use_brackets', 'protocol_version',
+            'buffer_size', 'store_body', 'follow_redirects', 'max_redirects',
+            'strict_redirects', 'ssl_verify_peer', 'ssl_verify_host',
+            'ssl_cafile', 'ssl_capath', 'ssl_local_cert', 'ssl_passphrase'
+        )));
+
+        // force CURL adapter, this allows to handle correctly
+        // compressed responses with simple SplObserver registered
+        $config['adapter'] = 'HTTP_Request2_Adapter_Curl';
+
+        try {
+            $request = new HTTP_Request2();
+            $request->setConfig($config);
+        }
+        catch (Exception $e) {
+            rcube::raise_error($e, true, false);
             return false;
         }