diff --git a/main.py b/main.py
index e0c98df..1156348 100644
--- a/main.py
+++ b/main.py
@@ -3,7 +3,7 @@ from src.params import parse_parameters
 from src.server import StaplerServer
 
 
-def main():
+def main() -> None:
     params = parse_parameters()
     setup_logs(params)
     server = StaplerServer(params)
diff --git a/pyproject.toml b/pyproject.toml
index 7f50ba6..aa0481c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,5 +15,5 @@ dev = [
 ]
 
 [tool.ruff.lint]
-select = ["E", "F", "C", "W", "I"]
-ignore = ["E501"]
+select = ["ALL"]
+ignore = ["D", "E501", "S104", "PLR2004", "ANN401", "BLE001", "COM812"]
\ No newline at end of file
diff --git a/src/data_dir.py b/src/data_dir.py
index d300ced..78c8ffa 100644
--- a/src/data_dir.py
+++ b/src/data_dir.py
@@ -1,69 +1,74 @@
-import io
 import logging
-import os
+import pathlib
 import re
 import shutil
 import tarfile
+import typing
+
+if typing.TYPE_CHECKING:
+    import io
 
 
 class DataDir:
     HOST_FILE = ".host"
     PATH_REGEX = re.compile(r"^[\w-]+$")
 
-    def __init__(self, root_path: str):
+    def __init__(self, root_path: str) -> None:
         self.logger = logging.getLogger(self.__class__.__name__)
-        self.root_path = root_path
+        self.root_path = pathlib.Path(root_path)
 
     def list_paths(self) -> list[str]:
         paths: list[str] = []
-        for path in os.listdir(self.root_path):
-            if self.__valid_path(path):
-                paths += [path]
+        for path in self.root_path.iterdir():
+            if self.exists(path.name):
+                paths += [path.name]
         return paths
 
-    def __valid_path(self, path: str, exists: bool = True) -> bool:
-        return (
-            not exists or os.path.isdir(os.path.join(self.root_path, path))
-        ) and self.PATH_REGEX.match(path) is not None
+    def __valid_path(self, path: str) -> bool:
+        return self.PATH_REGEX.match(path) is not None
 
-    def set_host(self, path: str, host: str):
-        if self.__valid_path(path):
-            path_host = os.path.join(self.root_path, path, self.HOST_FILE)
-            with open(path_host, mode="w") as host_file:
+    def set_host(self, path: str, host: str) -> None:
+        if self.exists(path):
+            path_host = self.root_path / path / self.HOST_FILE
+            with path_host.open(mode="w") as host_file:
                 host_file.write(host)
             self.logger.debug("Wrote %s", path_host)
 
-    def has_index(self, path: str):
-        if self.__valid_path(path):
-            path_index = os.path.join(self.root_path, path, "index.html")
-            return os.path.exists(path_index) and os.path.isfile(path_index)
+    def has_index(self, path: str) -> bool:
+        if self.exists(path):
+            path_index = self.root_path / path / "index.html"
+            return path_index.is_file()
+        return False
 
-    def get_host(self, path: str):
-        if self.__valid_path(path):
-            path_host = os.path.join(self.root_path, path, self.HOST_FILE)
-            if os.path.exists(path_host) and os.path.isfile(path_host):
+    def get_host(self, path: str) -> str | None:
+        if self.exists(path):
+            path_host = self.root_path / path / self.HOST_FILE
+            if path_host.is_file():
                 try:
-                    with open(path_host) as host_file:
+                    with path_host.open() as host_file:
                         return host_file.read().split("\n")[0].strip()
                 except Exception:
-                    pass
+                    self.logger.exception("Cannot read %s", path_host)
             return None
+        return None
 
-    def extract_tar_bytes(self, path: str, tar_bytes: io.BytesIO):
-        if self.__valid_path(path, exists=False):
-            target_path = os.path.join(self.root_path, path)
+    def extract_tar_bytes(self, path: str, tar_bytes: io.BytesIO) -> None:
+        if self.__valid_path(path):
+            target_path = self.root_path / path
             with tarfile.open(fileobj=tar_bytes) as tar_file:
-                if os.path.exists(target_path):
+                if target_path.exists():
                     shutil.rmtree(target_path)
                     self.logger.debug("Deleted %s", target_path)
-                tar_file.extractall(target_path)
+                tar_file.extractall(target_path, filter="data")
                 self.logger.debug("Extracted tar to %s", target_path)
 
-    def remove(self, path: str):
-        if self.__valid_path(path):
-            target_path = os.path.join(self.root_path, path)
+    def remove(self, path: str) -> None:
+        if self.exists(path):
+            target_path = self.root_path / path
             shutil.rmtree(target_path)
             self.logger.debug("Deleted %s", target_path)
 
-    def exists(self, path: str):
-        return self.__valid_path(path)
+    def exists(self, path: str) -> bool:
+        return (
+            self.PATH_REGEX.match(path) is not None and (self.root_path / path).is_dir()
+        )
diff --git a/src/handler.py b/src/handler.py
index c57dd4b..5ee9080 100644
--- a/src/handler.py
+++ b/src/handler.py
@@ -3,11 +3,15 @@ import http.server
 import io
 import logging
 import os
+import pathlib
 import re
 import tarfile
 import typing
 
-from . import data_dir, logs, params, project, registry
+from . import data_dir, logs, project
+
+if typing.TYPE_CHECKING:
+    from . import params, registry
 
 
 class RequestHandler(http.server.SimpleHTTPRequestHandler):
@@ -18,8 +22,12 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
 
     @typing.override
     def __init__(
-        self, *args, params: params.Parameters, registry: registry.Registry, **kwargs
-    ):
+        self,
+        *args: typing.Any,
+        params: params.Parameters,
+        registry: registry.Registry,
+        **kwargs: dict[str, typing.Any],
+    ) -> None:
         self.logger = logging.getLogger(self.__class__.__name__)
         self.default_host = params.host
         self.token = params.token
@@ -31,28 +39,28 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         super().__init__(*args, directory=params.data_dir, **kwargs)
 
     @typing.override
-    def do_HEAD(self):
+    def do_HEAD(self) -> None:
         self.__pre_log_request()
         super().do_HEAD()
 
     @typing.override
-    def do_GET(self):
+    def do_GET(self) -> None:
         self.__pre_log_request()
         if self.path == "/" and self.__get_host() == self.default_host:
             return self.__server_index()
         super().do_GET()
+        return None
 
-    def do_PUT(self):
+    def do_PUT(self) -> None:
         self.__pre_log_request()
-        if self.headers["X-Token"] != self.token:
-            return self.send_error(http.HTTPStatus.UNAUTHORIZED, "Invalid token")
-        if (sub_path := self.__get_subpath()) is None:
-            return self.send_error(http.HTTPStatus.BAD_REQUEST, "Invalid path")
+        if (sub_path := self.__check_update_request()) is None:
+            return None
         if (content_length := self.__get_length()) == 0:
             return self.send_error(http.HTTPStatus.LENGTH_REQUIRED, "No body found")
         if content_length > self.max_size_bytes:
             return self.send_error(
-                http.HTTPStatus.CONTENT_TOO_LARGE, "Archive too large"
+                http.HTTPStatus.CONTENT_TOO_LARGE,
+                "Archive too large",
             )
         try:
             file_bytes = io.BytesIO(self.rfile.read(content_length))
@@ -62,32 +70,35 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         except Exception as e:
             return self.send_error(http.HTTPStatus.INTERNAL_SERVER_ERROR, str(e))
         self.__send_status_only(
-            http.HTTPStatus.CREATED, f"Resource /{sub_path}/ updated"
+            http.HTTPStatus.CREATED,
+            f"Resource /{sub_path}/ updated",
         )
         if self.headers["X-Host"] is not None:
             self.registry.set_host(sub_path, self.headers["X-Host"])
         self.registry.add(sub_path)
+        return None
 
-    def do_DELETE(self):
+    def do_DELETE(self) -> None:
         self.__pre_log_request()
-        if self.headers["X-Token"] != self.token:
-            return self.send_error(http.HTTPStatus.UNAUTHORIZED, "Invalid token")
-        if (sub_path := self.__get_subpath()) is None:
-            return self.send_error(http.HTTPStatus.BAD_REQUEST, "Invalid path")
+        if (sub_path := self.__check_update_request()) is None:
+            return None
         if not self.data_dir.exists(sub_path):
-            return self.send_error(http.HTTPStatus.NOT_FOUND, "Not found")
+            self.send_error(http.HTTPStatus.NOT_FOUND, "Not found")
+            return None
         try:
             self.data_dir.remove(sub_path)
         except Exception as e:
             return self.send_error(http.HTTPStatus.INTERNAL_SERVER_ERROR, str(e))
         self.__send_status_only(
-            http.HTTPStatus.NO_CONTENT, f"Resource /{sub_path}/ removed"
+            http.HTTPStatus.NO_CONTENT,
+            f"Resource /{sub_path}/ removed",
         )
         self.registry.remove(sub_path)
+        return None
 
     @typing.override
-    def list_directory(self, *_, **__):
-        """Disable default directory listing"""
+    def list_directory(self, *_: typing.Any, **__: typing.Any) -> None:
+        """Disable default directory listing."""
         self.send_error(http.HTTPStatus.NOT_FOUND, "File not found")
 
     @typing.override
@@ -97,16 +108,19 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         if (page := self.registry.get_from_host(self.__get_host())) is not None:
             path = f"/{page.path}" + path
         path = super().translate_path(path)
-        if self.__get_subpath(match_full=False) is None:  # not a valid path
+        if self.__get_subpath() is None:  # not a valid path
             return ""
-        if os.path.basename(path).startswith("."):  # hidden files
+        if pathlib.Path(path).name.startswith("."):  # hidden files
             return ""
         return path
 
     @typing.override
     def send_error(
-        self, code: int, message: str | None = None, explain: str | None = None
-    ):
+        self,
+        code: int,
+        message: str | None = None,
+        explain: str | None = None,
+    ) -> None:
         shortmsg, longmsg = self.responses[code]
         if message is None:
             message = shortmsg
@@ -122,15 +136,17 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
             self.__send_status_only(code, message)
 
     @typing.override
-    def log_message(self, format: str, *args):
-        self.logger.info("%s - " + format, self.address_string(), *args)
+    def log_message(self, format: str, *args: typing.Any) -> None:
+        fmt = "%s - " + format
+        self.logger.info(fmt, self.address_string(), *args)
 
     @typing.override
-    def log_error(self, format: str, *args):
-        self.logger.error("%s - " + format, self.address_string(), *args)
+    def log_error(self, format: str, *args: typing.Any) -> None:
+        fmt = "%s - " + format
+        self.logger.error(fmt, self.address_string(), *args)
 
     @typing.override
-    def log_request(self, code="?", size=""):
+    def log_request(self, code: str = "?", size: str = "-") -> None:  # ty:ignore[invalid-method-override]
         if isinstance(code, http.HTTPStatus):
             color = logs.TermColor.RED
             if 100 <= code < 200:
@@ -145,26 +161,36 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         if size == "" and self.out_size > 0:
             size = str(self.out_size)
         args = (code, self.address_string(), self.__get_host(), self.requestline)
-        format = "→ %s - %s - %s - %s"
+        fmt = "→ %s - %s - %s - %s"
         if size != "":
             args = (*args, size)
-            format += " - %s"
-        self.logger.info(format, *args)
+            fmt += " - %s"
+        self.logger.info(fmt, *args)
 
-    def __pre_log_request(self):
+    def __pre_log_request(self) -> None:
         args = ("...", self.address_string(), self.__get_host(), self.requestline)
-        format = "← %s - %s - %s - %s"
+        fmt = "← %s - %s - %s - %s"
         if (size := self.__get_length()) > 0:
             args = (*args, size)
-            format += " - %s"
-        self.logger.debug(format, *args)
+            fmt += " - %s"
+        self.logger.debug(fmt, *args)
 
-    def __get_subpath(self, match_full: bool = True) -> str | None:
-        if match_full:
-            match = self.PATH_REGEX.fullmatch(self.path)
-        else:
-            match = self.PATH_REGEX.match(self.path)
-        if match is not None:
+    def __check_update_request(self) -> str | None:
+        if self.headers["X-Token"] != self.token:
+            self.send_error(http.HTTPStatus.UNAUTHORIZED, "Invalid token")
+            return None
+        if (sub_path := self.__get_subpath_full()) is None:
+            self.send_error(http.HTTPStatus.BAD_REQUEST, "Invalid path")
+            return None
+        return sub_path
+
+    def __get_subpath(self) -> str | None:
+        if (match := self.PATH_REGEX.match(self.path)) is not None:
+            return match.group(1)
+        return None
+
+    def __get_subpath_full(self) -> str | None:
+        if (match := self.PATH_REGEX.fullmatch(self.path)) is not None:
             return match.group(1)
         return None
 
@@ -176,10 +202,9 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
     def __get_length(self) -> int:
         if not self.headers["Content-Length"]:
             return 0
-        else:
-            return int(self.headers["Content-Length"])
+        return int(self.headers["Content-Length"])
 
-    def __server_index(self):
+    def __server_index(self) -> None:
         self.__send_basic_body(self.server_version + "\n")
 
     def __send_basic_body(
@@ -188,7 +213,7 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         content_type: str = "text/plain",
         code: int = http.HTTPStatus.OK,
         message: str | None = None,
-    ):
+    ) -> None:
         encoded: bytes = body.encode()
         self.out_size = len(encoded)
         self.send_response(code, message)
@@ -197,7 +222,7 @@ class RequestHandler(http.server.SimpleHTTPRequestHandler):
         self.end_headers()
         self.wfile.write(encoded)
 
-    def __send_status_only(self, code: int, message: str | None = None):
+    def __send_status_only(self, code: int, message: str | None = None) -> None:
         self.send_response(code, message)
         self.send_header("Content-Length", "0")
         self.end_headers()
diff --git a/src/logs.py b/src/logs.py
index 25503d0..32a54c5 100644
--- a/src/logs.py
+++ b/src/logs.py
@@ -2,7 +2,8 @@ import enum
 import logging
 import typing
 
-from . import params
+if typing.TYPE_CHECKING:
+    from . import params
 
 
 class TermColor(enum.StrEnum):
@@ -24,11 +25,12 @@ class TermColor(enum.StrEnum):
     def __str__(self) -> str:
         return f"\033[{self.value}m"
 
-    def __add__(self, second):
-        return str(self) + str(second)
+    @typing.override
+    def __add__(self, value: typing.Any, /) -> str:  # ty:ignore[invalid-method-override]
+        return str(self) + str(value)
 
-    def __radd__(self, second):
-        return str(second) + str(self)
+    def __radd__(self, value: typing.Any, /) -> str:
+        return str(value) + str(self)
 
 
 class ColoredLoggingFormatter(logging.Formatter):
@@ -42,7 +44,7 @@ class ColoredLoggingFormatter(logging.Formatter):
         + TermColor.RESET
     )
 
-    FORMAT_COLORS = {
+    FORMAT_COLORS: typing.ClassVar[dict[int, TermColor | str]] = {
         logging.DEBUG: TermColor.FEINT + TermColor.GREY,
         logging.INFO: TermColor.GREEN,
         logging.WARNING: TermColor.YELLOW,
@@ -51,16 +53,15 @@ class ColoredLoggingFormatter(logging.Formatter):
     }
 
     @typing.override
-    def __init__(self, trace: bool):
+    def __init__(self, trace: bool) -> None:
         self.trace = trace
         super().__init__()
 
     @typing.override
-    def format(self, record: logging.LogRecord):
-        log_color: TermColor = (
-            self.FORMAT_COLORS[record.levelno]
-            if record.levelno in self.FORMAT_COLORS
-            else TermColor.MAGENTA
+    def format(self, record: logging.LogRecord) -> str:
+        log_color: TermColor | str = self.FORMAT_COLORS.get(
+            record.levelno,
+            TermColor.MAGENTA,
         )
         formatter = logging.Formatter(
             self.pre_format
@@ -69,12 +70,12 @@ class ColoredLoggingFormatter(logging.Formatter):
             + self.level_format
             + TermColor.RESET
             + self.post_format
-            + (self.trace_format if self.trace else "")
+            + (self.trace_format if self.trace else ""),
         )
         return formatter.format(record)
 
 
-def setup_logs(params: params.Parameters):
+def setup_logs(params: params.Parameters) -> None:
     stream_handler = logging.StreamHandler()
     stream_handler.setFormatter(ColoredLoggingFormatter(trace=params.debug))
     log_level = logging.INFO
diff --git a/src/params.py b/src/params.py
index f83f2ed..15087d1 100644
--- a/src/params.py
+++ b/src/params.py
@@ -1,7 +1,6 @@
 import argparse
 import dataclasses
 import os
-import os.path
 
 from . import project
 
@@ -19,7 +18,7 @@ class Parameters:
     debug: bool
 
     @classmethod
-    def from_namespace(cls, args: argparse.Namespace) -> "Parameters":
+    def from_namespace(cls, args: argparse.Namespace) -> Parameters:
         return Parameters(**vars(args))
 
 
@@ -37,37 +36,48 @@ def __get_env_int(var: str, default: int) -> int:
 
 
 def __add_arg_str(
-    parser: argparse.ArgumentParser, *flags: str, env_var: str, default: str, help: str
-):
+    parser: argparse.ArgumentParser,
+    *flags: str,
+    env_var: str,
+    default: str,
+    help_txt: str,
+) -> None:
     parser.add_argument(
         *flags,
         metavar=env_var,
         default=__get_env_str(env_var, default),
-        help=f"{help} (default: {default})",
+        help=f"{help_txt} (default: {default})",
     )
 
 
 def __add_arg_int(
-    parser: argparse.ArgumentParser, *flags: str, env_var: str, default: int, help: str
-):
+    parser: argparse.ArgumentParser,
+    *flags: str,
+    env_var: str,
+    default: int,
+    help_txt: str,
+) -> None:
     parser.add_argument(
         *flags,
         type=int,
         metavar=env_var,
         default=__get_env_int(env_var, default),
-        help=f"{help} (default: {default})",
+        help=f"{help_txt} (default: {default})",
     )
 
 
 def __add_arg_str_required(
-    parser: argparse.ArgumentParser, *flags: str, env_var: str, help: str
-):
+    parser: argparse.ArgumentParser,
+    *flags: str,
+    env_var: str,
+    help_txt: str,
+) -> None:
     parser.add_argument(
         *flags,
         metavar=env_var,
         required=os.getenv(env_var) is None,
         default=os.getenv(env_var),
-        help=f"{help}",
+        help=help_txt,
     )
 
 
@@ -78,36 +88,41 @@ def parse_parameters() -> Parameters:
         epilog="(Each option can be supplied with equivalent environment variable.)",
     )
     __add_arg_int(
-        parser, "-p", "--port", env_var="PORT", default=8080, help="server port"
+        parser,
+        "-p",
+        "--port",
+        env_var="PORT",
+        default=8080,
+        help_txt="server port",
     )
     __add_arg_str(
         parser,
         "--host",
         env_var="HOST",
         default="localhost:8080",
-        help="server default host",
+        help_txt="server default host",
     )
     __add_arg_str(
         parser,
         "-d",
         "--data-dir",
         env_var="DATA_DIR",
-        default=os.path.join(".", "data"),
-        help="directory where pages are/will be stored",
+        default="./data",
+        help_txt="directory where pages are/will be stored",
     )
     __add_arg_str_required(
         parser,
         "-t",
         "--token",
         env_var="TOKEN",
-        help="secret token for update requests",
+        help_txt="secret token for update requests",
     )
     __add_arg_int(
         parser,
         "--max-size-bytes",
         env_var="MAX_SIZE",
         default=2_000_000,
-        help="max size of accepted archives (in bytes)",
+        help_txt="max size of accepted archives (in bytes)",
     )
     __add_arg_str(
         parser,
@@ -115,21 +130,21 @@ def parse_parameters() -> Parameters:
         "--bind",
         env_var="BIND",
         default="0.0.0.0",
-        help="server bind address",
+        help_txt="server bind address",
     )
     __add_arg_str(
         parser,
         "--certbot-conf",
         env_var="CERTBOT_CONF",
         default="/etc/letsencrypt",
-        help="Certbot config dir",
+        help_txt="Certbot config dir",
     )
     __add_arg_str(
         parser,
         "--certbot-www",
         env_var="CERTBOT_WWW",
-        default=os.path.join(".", "data", ".certbot"),
-        help="Certbot www dir",
+        default="./data/.certbot",
+        help_txt="Certbot www dir",
     )
     parser.add_argument("--debug", action=argparse.BooleanOptionalAction)
     args = parser.parse_args()
diff --git a/src/project.py b/src/project.py
index 80358f3..b2cdb27 100644
--- a/src/project.py
+++ b/src/project.py
@@ -1,29 +1,26 @@
-import os.path
+import pathlib
 import typing
 
 import toml
 
-__project_data = None
-
 
 def __get_project_data() -> None | dict[str, typing.Any]:
-    global __project_data
-    if __project_data is None:
-        pyproject_toml_file = os.path.join(
-            os.path.dirname(__file__), "..", "pyproject.toml"
-        )
-        if os.path.exists(pyproject_toml_file) and os.path.isfile(pyproject_toml_file):
-            try:
-                data = toml.load(pyproject_toml_file)
-                if "project" in data:
-                    __project_data = data["project"]
-            except TypeError, toml.TomlDecodeError, FileNotFoundError:
-                pass
-    return __project_data
+    pyproject_toml_file = pathlib.Path(__file__) / ".." / ".." / "pyproject.toml"
+    if pyproject_toml_file.is_file():
+        try:
+            data = toml.load(pyproject_toml_file)
+            if "project" in data:
+                return data["project"]
+        except TypeError, toml.TomlDecodeError, FileNotFoundError:
+            pass
+    return None
+
+
+__project_data = __get_project_data()
 
 
 def __get_str_value(key: str) -> str:
-    project_data = __get_project_data()
+    project_data = __project_data
     if project_data is not None and key in project_data:
         return project_data[key]
     return "unknown"
diff --git a/src/registry.py b/src/registry.py
index e62fb35..21237b2 100644
--- a/src/registry.py
+++ b/src/registry.py
@@ -1,31 +1,37 @@
 import logging
+import typing
 
-from . import data_dir, page, params
+from . import data_dir, page
+
+if typing.TYPE_CHECKING:
+    from . import params
 
 
 class Registry:
-    def __init__(self, params: params.Parameters):
+    def __init__(self, params: params.Parameters) -> None:
         self.logger = logging.getLogger(self.__class__.__name__)
         self.pages: dict[str, page.Page] = {}
         self.data_dir = data_dir.DataDir(params.data_dir)
         self.prefix = f"http://{params.host}"
 
-    def load_pages(self):
+    def load_pages(self) -> None:
         self.pages = {}
         for path in self.data_dir.list_paths():
             self.add(path)
 
-    def add(self, path: str):
+    def add(self, path: str) -> None:
         self.pages[path] = page.Page(
-            path, self.data_dir.has_index(path), self.data_dir.get_host(path)
+            path,
+            self.data_dir.has_index(path),
+            self.data_dir.get_host(path),
         )
         self.logger.info("Updated %s%s", self.prefix, str(self.pages[path]))
 
-    def set_host(self, path: str, host: str):
+    def set_host(self, path: str, host: str) -> None:
         self.data_dir.set_host(path, host)
         self.pages[path].host = host
 
-    def remove(self, path: str):
+    def remove(self, path: str) -> None:
         page = self.pages[path]
         del self.pages[path]
         self.logger.info("Removed %s%s", self.prefix, str(page))
@@ -34,3 +40,4 @@ class Registry:
         for p in self.pages.values():
             if p.host == host:
                 return p
+        return None
diff --git a/src/server.py b/src/server.py
index ea15fbc..3a45a43 100644
--- a/src/server.py
+++ b/src/server.py
@@ -1,12 +1,17 @@
+import contextlib
 import http.server
 import logging
-import os
+import pathlib
+import typing
 
-from . import handler, params, project, registry
+from . import handler, project, registry
+
+if typing.TYPE_CHECKING:
+    from . import params
 
 
 class StaplerServer:
-    def __init__(self, params: params.Parameters):
+    def __init__(self, params: params.Parameters) -> None:
         self.logger = logging.getLogger(self.__class__.__name__)
         self.params = params
         self.registry = registry.Registry(params)
@@ -15,18 +20,20 @@ class StaplerServer:
             self.request_handler,
         )
 
-    def request_handler(self, *args) -> http.server.BaseHTTPRequestHandler:
+    def request_handler(self, *args: typing.Any) -> http.server.BaseHTTPRequestHandler:
         return handler.RequestHandler(*args, params=self.params, registry=self.registry)
 
-    def __init_certbot_www(self):
-        os.makedirs(self.params.certbot_www, exist_ok=True)
+    def __init_certbot_www(self) -> None:
+        certbot_www_path = pathlib.Path(self.params.certbot_www)
+        if not certbot_www_path.exists():
+            certbot_www_path.mkdir(parents=True)
 
-    def __startup(self):
+    def __startup(self) -> None:
         self.logger.info("Starting up...")
         self.registry.load_pages()
         self.__init_certbot_www()
 
-    def start(self):
+    def start(self) -> None:
         self.logger.info("Version %s", project.get_version())
         self.__startup()
         self.logger.info(
@@ -38,7 +45,5 @@ class StaplerServer:
             "Server up and ready on http://%s",
             self.params.host,
         )
-        try:
+        with contextlib.suppress(KeyboardInterrupt):
             self.server.serve_forever()
-        except KeyboardInterrupt:
-            pass