Fix some issues, improve documentation

server/command.py

@@ -75,7 +75,7 @@ class AbstractCommand(ABC):
         self._process_conditional_headers()
 
         message = f"HTTP/1.1 {status} {status_message[status]}\r\n"
-        message += self._get_date() + "\r\n"
+        message += f"Date: {self._get_date()}\r\n"
 
         content_length = len(body)
         message += f"Content-Length: {content_length}\r\n"
@@ -107,7 +107,7 @@ class AbstractCommand(ABC):
             path = root + norm_path
 
         if check and not os.path.exists(path):
-            raise NotFound()
+            raise NotFound(path)
 
         return path
 
@@ -131,7 +131,7 @@ class AbstractCommand(ABC):
             return True
 
         if modified <= min_date:
-            raise NotModified()
+            raise NotModified(f"{modified} <= {min_date}")
 
         return True
 
@@ -149,11 +149,11 @@ class AbstractModifyCommand(AbstractCommand, ABC):
 
     def execute(self):
         path = self._get_path(False)
-        dir = os.path.dirname(path)
+        directory = os.path.dirname(path)
 
-        if not os.path.exists(dir):
+        if not os.path.exists(directory):
             raise Forbidden("Target directory does not exists!")
-        if os.path.exists(dir) and not os.path.isdir(dir):
+        if os.path.exists(directory) and not os.path.isdir(directory):
             raise Forbidden("Target directory is an existing file!")
 
         exists = os.path.exists(path)