diff --git a/server/file_read.py b/server/file_read.py
index e4764b9..8e2da58 100644
--- a/server/file_read.py
+++ b/server/file_read.py
@@ -18,13 +18,20 @@
 #
 
 import logging
+import os
 
 
 log = logging.getLogger(__name__)
 
-def fileiter(filename):
-    log.debug("Open file %s to byte-read" % filename)
+def file_iterator(filename):
+    log.debug("Try access to file \"%s\"", filename)
+    if not os.path.isfile(filename):
+        raise FileNotFoundError("File \"%s\" not found", filename)
 
+    log.debug("Get size of file \"%s\"", filename)
+    yield os.path.getsize(filename)
+
+    log.debug("Open file \"%s\" to byte-read", filename)
     with open(filename, "rb") as f:
         while True:
             file_data = f.read(1024)
diff --git a/server/http_handler.py b/server/http_handler.py
index 5a8c4d9..18d2cd3 100644
--- a/server/http_handler.py
+++ b/server/http_handler.py
@@ -22,7 +22,7 @@ import logging
 import config
 
 from .common import MAX_REQUEST_LINE_SIZE, HandlerType, HTTPMethod
-from .file_read import fileiter
+from .file_read import file_iterator
 from .response import Response
 
 
@@ -44,10 +44,13 @@ class HTTPHandler:
 
         self.data = b""
 
-        self.__handle_connection()
+        try:
+            self.__handle_connection()
+        except BrokenPipeError:
+            log.info("Conenction pipe broken, close thread")
 
-    def __write_data(self, data_iter):
-        for chunk in data_iter:
+    def __write_data(self, response):
+        for chunk in response:
             self.write_fd.write(chunk)
             self.write_fd.flush()
 
@@ -202,14 +205,14 @@ class HTTPHandler:
                 self.__close()
                 return
 
-            log.debug("Want to receive {} bytes from client".format(bytes_to_receive))
+            log.debug("Want to receive %s bytes from client", bytes_to_receive)
             self.data = self.read_fd.read(bytes_to_receive)
 
-        log.debug("Request method: %s" % self.http_method)
-        log.debug("Requested address: %s" % self.http_address)
-        log.debug("Request headers: %s" % self.http_headers)
-        log.debug("Request in GET after ?: %s" % self.http_get_request)
-        log.debug("Data: %s" % self.data)
+        log.debug("Request method: %s", self.http_method)
+        log.debug("Requested address: %s", self.http_address)
+        log.debug("Request headers: %s", self.http_headers)
+        log.debug("Request in GET after ?: %s", self.http_get_request)
+        log.debug("Data: %s", self.data)
 
         self.__send_form_data()
 
@@ -225,8 +228,8 @@ class HTTPHandler:
                     found = True
 
                     if path.handler_type == HandlerType.STATIC_FILE:
-                        log.debug("Address associated with static file on path {}".format(path.link))
-                        r = Response(data=fileiter(path.link))
+                        log.debug("Address associated with static file on path %s", path.link)
+                        r = Response(data=file_iterator(path.link))
                         self.__write_data(r)
 
                     elif path.handler_type == HandlerType.FUNCTION:
@@ -258,4 +261,4 @@ class HTTPHandler:
             r = Response(status_code=404, data=b"Not found!")
             self.__write_data(r)
 
-        self.__close()
+        self.__handle_connection()
diff --git a/server/main.py b/server/main.py
index 3325429..6a4a25c 100644
--- a/server/main.py
+++ b/server/main.py
@@ -16,18 +16,21 @@ def init_server_socket(server_handler):
 
     try:
         with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as main_server_socket:
+            log.debug("Set socket option REUSEADDR to True")
             main_server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
-            log.debug("Attempt to bind socket to 0.0.0.0:{}".format(config.SETUP["server"]["port"]))
+
+            log.info("Attempt to bind socket to 0.0.0.0:%d", config.SETUP["server"]["port"])
             main_server_socket.bind(("0.0.0.0", config.SETUP["server"]["port"]))
-            log.debug("Make socket is listen")
+
+            log.debug("Make socket to listen")
             main_server_socket.listen()
 
             while True:
                 conn, addr = main_server_socket.accept()
-                log.info("Accepted connection from %s", addr[0])
+                log.info("Accept connection from %s", addr[0])
 
                 thr_serv_conn = threading.Thread(target=server_handler, args=(conn, addr,), daemon=True)
-                thr_serv_conn.run()
+                thr_serv_conn.start()
 
     except KeyboardInterrupt:
         log.info("Server get keyboard interrupt, bye!")
diff --git a/server/response.py b/server/response.py
index ec2ecf3..7cf4c17 100644
--- a/server/response.py
+++ b/server/response.py
@@ -51,11 +51,17 @@ class Response:
 
             resp = "HTTP/1.1 {} {}\r\n"
             resp += "Server: cnserv\r\n"
-            resp += "Connection: close\r\n"
+            resp += "Connection: keep-alive\r\n"
+
             for key, val in self.additional_headers.items():
                 resp += "{}: {}\r\n".format(key, val)
-            resp += "\r\n"
 
+            if type(self.data) == bytes:
+                resp += "Content-Length: {}\r\n".format(len(self.data))
+            elif hasattr(self.data, "__iter__"):
+                resp += "Content-Length: {}\r\n".format(next(self.data))
+
+            resp += "\r\n"
             resp = resp.format(self.status_code, STATUS_BY_CODE[self.status_code])
             resp = resp.encode("UTF-8")