diff --git a/core/src/bugis/core/_app.py b/core/src/bugis/core/_app.py
index 2b3089b..fdd70fd 100644
--- a/core/src/bugis/core/_app.py
+++ b/core/src/bugis/core/_app.py
@@ -2,14 +2,18 @@ from abc import ABC, abstractmethod
 from asyncio import Queue, AbstractEventLoop
 from asyncio import get_running_loop
 from logging import getLogger
-from typing import Callable, Awaitable, Any, Mapping, Sequence, Optional, Unpack, Tuple
-
+from typing import Callable, Awaitable, Any, Mapping, Sequence, Optional, Unpack, Tuple, TYPE_CHECKING
+from pathlib import Path, PurePath
 from pwo import Maybe, AsyncQueueIterator
-
+from hashlib import md5
 from ._http_context import HttpContext
 from ._http_method import HttpMethod
 from ._types import StrOrStrings
+from base64 import b64encode, b64decode
+from mimetypes import guess_type
 
+if TYPE_CHECKING:
+    from _typeshed import StrOrBytesPath
 try:
     from ._rsgi import RsgiContext
     from granian._granian import RSGIHTTPProtocol, RSGIHTTPScope  # type: ignore
@@ -141,3 +145,5 @@ class BugisApp(AbstractBugisApp):
 
     def PATCH(self, path: str, recursive: bool = False) -> Callable[[HttpHandler], HttpHandler]:
         return self.route(path, (HttpMethod.PATCH,), recursive)
+
+
diff --git a/core/src/bugis/core/_asgi.py b/core/src/bugis/core/_asgi.py
index 20b83c5..5c56e86 100644
--- a/core/src/bugis/core/_asgi.py
+++ b/core/src/bugis/core/_asgi.py
@@ -34,11 +34,11 @@ def decode_headers(headers: Iterable[Tuple[bytes, bytes]]) -> Dict[str, Sequence
             raise NotImplementedError('This should never happen')
         if isinstance(value, bytes):
             value_str = value.decode()
-        elif isinstance(key, str):
+        elif isinstance(value, str):
             value_str = value
         else:
             raise NotImplementedError('This should never happen')
-        ls = result.setdefault(key_str, list())
+        ls = result.setdefault(key_str.lower(), list())
         ls.append(value_str)
     return {
         k: tuple(v) for k, v in result.items()
@@ -91,7 +91,7 @@ class AsgiContext(HttpContext):
     async def stream_body(self,
                           status: int,
                           body_generator: AsyncGenerator[bytes, None],
-                          headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+                          headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self._send_head(status, headers)
         async for chunk in body_generator:
             await self.send({
@@ -105,21 +105,21 @@ class AsgiContext(HttpContext):
             'more_body': False
         })
 
-    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self._send_head(status, headers)
         await self.send({
             'type': 'http.response.body',
             'body': body,
         })
 
-    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self._send_head(status, headers)
         await self.send({
             'type': 'http.response.body',
             'body': body.encode(),
         })
 
-    async def _send_head(self, status: int, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def _send_head(self, status: int, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self.send({
             'type': 'http.response.start',
             'status': status,
@@ -129,7 +129,7 @@ class AsgiContext(HttpContext):
     async def send_file(self,
                         status: int,
                         path: Path,
-                        headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+                        headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         if self.pathsend:
             await self._send_head(status, headers)
             await self.send({
@@ -139,7 +139,7 @@ class AsgiContext(HttpContext):
         else:
             raise NotImplementedError()
 
-    async def send_empty(self, status: int, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_empty(self, status: int, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self._send_head(status, headers)
         await self.send({
             'type': 'http.response.body',
diff --git a/core/src/bugis/core/_http_context.py b/core/src/bugis/core/_http_context.py
index 1380855..9c87452 100644
--- a/core/src/bugis/core/_http_context.py
+++ b/core/src/bugis/core/_http_context.py
@@ -13,6 +13,7 @@ from abc import ABC, abstractmethod
 from pathlib import Path
 
 from ._http_method import HttpMethod
+from ._types.base import StrOrStrings
 
 
 class HttpContext(ABC):
@@ -32,20 +33,20 @@ class HttpContext(ABC):
     async def stream_body(self,
                           status: int,
                           body_generator: AsyncGenerator[bytes, None],
-                          headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+                          headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         pass
 
     @abstractmethod
-    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         pass
 
-    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         await self.send_bytes(status, body.encode(), headers)
 
     @abstractmethod
-    async def send_file(self, status: int, path: Path, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_file(self, status: int, path: Path, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         pass
 
     @abstractmethod
-    async def send_empty(self, status: int, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_empty(self, status: int, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         pass
diff --git a/core/src/bugis/core/_rsgi.py b/core/src/bugis/core/_rsgi.py
index 5289cab..1f2be10 100644
--- a/core/src/bugis/core/_rsgi.py
+++ b/core/src/bugis/core/_rsgi.py
@@ -17,6 +17,7 @@ from typing import (
 from granian._granian import RSGIHTTPProtocol, RSGIHTTPScope
 from pwo import Maybe
 
+from ._types import StrOrStrings
 from ._http_context import HttpContext
 from ._http_method import HttpMethod
 
@@ -40,7 +41,7 @@ class RsgiContext(HttpContext):
         self.query_string = scope.query_string
 
         def acc(d: Dict[str, List[str]], t: Tuple[str, str]) -> Dict[str, List[str]]:
-            d.setdefault(t[0], list()).append(t[1])
+            d.setdefault(t[0].lower(), list()).append(t[1])
             return d
 
         fun = cast(Callable[[Mapping[str, Sequence[str]], tuple[str, str]], Mapping[str, Sequence[str]]], acc)
@@ -54,16 +55,27 @@ class RsgiContext(HttpContext):
         self.request_body = aiter(protocol)
         self.protocol = protocol
 
+    # @staticmethod
+    # def _rearrange_headers(headers: Mapping[str, Sequence[str]]) -> List[Tuple[str, str]]:
+    #     return list(
+    #         ((key, value) for key, values in headers.items() for value in values)
+    #     )
+
     @staticmethod
-    def _rearrange_headers(headers: Mapping[str, Sequence[str]]) -> List[Tuple[str, str]]:
-        return list(
-            ((key, value) for key, values in headers.items() for value in values)
-        )
+    def _rearrange_headers(headers: Mapping[str, StrOrStrings]) -> List[Tuple[str, str]]:
+        result = []
+        for key, value in headers.items():
+            if isinstance(value, str):
+                result.append((key, value))
+            elif isinstance(value, Sequence):
+                for single_value in value:
+                    result.append((key, single_value))
+        return result
 
     async def stream_body(self,
                           status: int,
                           body_generator: AsyncGenerator[bytes, None],
-                          headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+                          headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         transport = self.protocol.response_stream(status,
                                                   Maybe.of_nullable(headers)
                                                     .map(self._rearrange_headers)
@@ -71,24 +83,25 @@ class RsgiContext(HttpContext):
         async for chunk in body_generator:
             await transport.send_bytes(chunk)
 
-    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_bytes(self, status: int, body: bytes, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         rearranged_headers = Maybe.of_nullable(headers).map(RsgiContext._rearrange_headers).or_else(list())
         if len(body) > 0:
             self.protocol.response_bytes(status, rearranged_headers, body)
         else:
             self.protocol.response_empty(status, rearranged_headers)
 
-    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_str(self, status: int, body: str, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         rearranged_headers = Maybe.of_nullable(headers).map(RsgiContext._rearrange_headers).or_else(list())
         if len(body) > 0:
             self.protocol.response_str(status, rearranged_headers, body)
         else:
             self.protocol.response_empty(status, rearranged_headers)
 
-    async def send_file(self, status: int, path: Path, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
-        rearranged_headers = Maybe.of_nullable(headers).map(RsgiContext._rearrange_headers).or_else(list())
+    async def send_file(self, status: int, path: Path, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
+        rearranged_headers = (Maybe.of_nullable(headers).map(RsgiContext._rearrange_headers)
+                              .or_else(list()))
         self.protocol.response_file(status, rearranged_headers, str(path))
 
-    async def send_empty(self, status: int, headers: Optional[Mapping[str, Sequence[str]]] = None) -> None:
+    async def send_empty(self, status: int, headers: Optional[Mapping[str, StrOrStrings]] = None) -> None:
         rearranged_headers = Maybe.of_nullable(headers).map(RsgiContext._rearrange_headers).or_else(list())
         self.protocol.response_empty(status, rearranged_headers)
diff --git a/core/src/bugis/core/_tree.py b/core/src/bugis/core/_tree.py
index bc72d69..2e2067a 100644
--- a/core/src/bugis/core/_tree.py
+++ b/core/src/bugis/core/_tree.py
@@ -20,7 +20,8 @@ from ._http_context import HttpContext
 from ._http_method import HttpMethod
 from ._path_handler import PathHandler
 from ._path_matcher import PathMatcher, IntMatcher, GlobMatcher, StrMatcher, Node
-from ._types import NodeType, Matches
+from ._path_handler import Matches
+from ._types import NodeType
 
 
 class Tree:
diff --git a/core/src/bugis/core/_types/__init__.py b/core/src/bugis/core/_types/__init__.py
index 73fc6b0..6b0447c 100644
--- a/core/src/bugis/core/_types/__init__.py
+++ b/core/src/bugis/core/_types/__init__.py
@@ -12,16 +12,12 @@ from typing import (
     Sequence
 )
 
+from .base import StrOrStrings, PathMatcherResult
+
 from bugis.core._http_method import HttpMethod
 
-from bugis.core._path_handler import PathHandler, Matches
-
-type StrOrStrings = (str | Sequence[str])
-
 type NodeType = (str | HttpMethod)
 
-type PathMatcherResult = Mapping[str, Any] | Sequence[str]
-
 
 class ASGIVersions(TypedDict):
     spec_version: str
@@ -90,7 +86,6 @@ __all__ = [
     'RSGI',
     'ASGIVersions',
     'WebSocketScope',
-    'PathHandler',
     'NodeType',
-    'Matches'
+    'StrOrStrings'
 ]
diff --git a/core/src/bugis/core/_types/base.py b/core/src/bugis/core/_types/base.py
new file mode 100644
index 0000000..0a664c1
--- /dev/null
+++ b/core/src/bugis/core/_types/base.py
@@ -0,0 +1,4 @@
+from typing import Sequence, Mapping, Any
+
+type StrOrStrings = (str | Sequence[str])
+type PathMatcherResult = Mapping[str, Any] | Sequence[str]
diff --git a/core/tests/test_ciao.py b/core/tests/test_ciao.py
new file mode 100644
index 0000000..fed2d73
--- /dev/null
+++ b/core/tests/test_ciao.py
@@ -0,0 +1,38 @@
+import unittest
+
+
+# Define some test cases
+class TestAddition(unittest.TestCase):
+    def test_add_positive(self):
+        self.assertEqual(1 + 2, 3)
+
+    def test_add_negative(self):
+        self.assertEqual(-1 + (-1), -2)
+
+
+class TestSubtraction(unittest.TestCase):
+    def test_subtract_positive(self):
+        self.assertEqual(5 - 3, 2)
+
+    def test_subtract_negative(self):
+        self.assertEqual(-5 - (-2), -3)
+
+
+# Now let's create a TestSuite
+def suite():
+    suite = unittest.TestSuite()
+
+    # Add tests to the suite
+    suite.addTest(TestAddition('test_add_positive'))
+    suite.addTest(TestAddition('test_add_negative'))
+    suite.addTest(TestSubtraction('test_subtract_positive'))
+    # suite.addTest(TestSubtraction('test_subtract_negative'))
+    # suite.addTest(TestSubtraction('test_subtract_negative2'))
+
+    return suite
+
+
+# Running the suite
+if __name__ == "__main__":
+    runner = unittest.TextTestRunner()
+    runner.run(suite())
\ No newline at end of file
diff --git a/server/example/test_server.py b/server/example/test_server.py
new file mode 100644
index 0000000..2272f44
--- /dev/null
+++ b/server/example/test_server.py
@@ -0,0 +1,12 @@
+
+from bugis.core import BugisApp
+from pathlib import PurePath
+from bugis.server.server import static_resources
+import os
+
+root = os.getenv('STATIC_ROOT') or '.'
+app = BugisApp()
+
+static_resources(app, '/view', root)
+
+
diff --git a/server/pyproject.toml b/server/pyproject.toml
new file mode 100644
index 0000000..12a3853
--- /dev/null
+++ b/server/pyproject.toml
@@ -0,0 +1,67 @@
+[build-system]
+requires = ["setuptools>=61.0", "setuptools-scm>=8"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "bugis_server"
+dynamic = ["version"]
+authors = [
+  { name="Walter Oggioni", email="oggioni.walter@gmail.com" },
+]
+description = "Static file renderer"
+readme = "README.md"
+requires-python = ">=3.10"
+classifiers = [
+        'Development Status :: 3 - Alpha',
+        'Topic :: Utilities',
+        'License :: OSI Approved :: MIT License',
+        'Intended Audience :: System Administrators',
+        'Intended Audience :: Developers',
+        'Environment :: Console',
+        'License :: OSI Approved :: MIT License',
+        'Programming Language :: Python :: 3',
+]
+dependencies = [
+    "bugis_core",
+    "Markdown",
+    "Pygments",
+    "watchdog",
+    "pwo",
+    "PyYAML",
+    "pygraphviz",
+    "aiofiles",
+    "httpx[http2]"
+]
+
+[project.optional-dependencies]
+dev = [
+    "build", "granian", "mypy", "ipdb", "twine"
+]
+
+run = [
+    "granian"
+]
+
+[tool.setuptools.package-data]
+bugis = ['static/*', 'default-conf/*']
+
+[project.urls]
+"Homepage" = "https://github.com/woggioni/bugis"
+"Bug Tracker" = "https://github.com/woggioni/bugis/issues"
+
+[tool.mypy]
+python_version = "3.12"
+disallow_untyped_defs = true
+show_error_codes = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unused_ignores = true
+exclude = ["scripts", "docs", "test"]
+strict = true
+
+[tool.setuptools_scm]
+root='..'
+version_file = "src/bugis/server/_version.py"
+
+[project.scripts]
+bugis = "bugis.server.cli:main"
\ No newline at end of file
diff --git a/server/src/bugis/server/__init__.py b/server/src/bugis/server/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/server/src/bugis/server/cache.py b/server/src/bugis/server/cache.py
new file mode 100644
index 0000000..6c8daa5
--- /dev/null
+++ b/server/src/bugis/server/cache.py
@@ -0,0 +1,16 @@
+from abc import ABC, abstractmethod
+from typing import Optional
+
+
+class Cache(ABC):
+
+    @abstractmethod
+    def get(self, key: bytes) -> Optional[bytes]:
+        pass
+
+    @abstractmethod
+    def put(self, key: bytes, value: bytes):
+        pass
+
+    def __contains__(self, key: bytes):
+        return self.get(key) is not None
diff --git a/server/src/bugis/server/cli.py b/server/src/bugis/server/cli.py
new file mode 100644
index 0000000..67a4e9a
--- /dev/null
+++ b/server/src/bugis/server/cli.py
@@ -0,0 +1,3 @@
+
+def main():
+    pass
diff --git a/server/src/bugis/server/server.py b/server/src/bugis/server/server.py
new file mode 100644
index 0000000..1df50dd
--- /dev/null
+++ b/server/src/bugis/server/server.py
@@ -0,0 +1,129 @@
+from base64 import b64encode
+from hashlib import md5
+from mimetypes import guess_type
+from pathlib import Path, PurePath
+from typing import TYPE_CHECKING, Optional, Callable, Awaitable, AsyncGenerator, Any, Unpack
+
+from aiofiles.os import listdir
+from aiofiles.ospath import isdir, isfile
+from bugis.core import HttpContext, BugisApp
+from pwo import Maybe
+
+if TYPE_CHECKING:
+    from _typeshed import StrOrBytesPath
+
+
+def parse_etag(etag: str) -> Optional[str]:
+    def skip_weak_marker(s):
+        if s.startswith('W/'):
+            return s[2:]
+        else:
+            return s
+
+    return (
+        Maybe.of_nullable(etag)
+        .map(skip_weak_marker)
+        .or_else(None)
+    )
+
+
+def static_resources(app: BugisApp,
+                     path: str,
+                     root: 'StrOrBytesPath',
+                     favicon: PurePath = None,
+                     file_filter: Callable[[PurePath], Awaitable[bool]] = None
+                     ):
+    async def no_filter(_: PurePath):
+        return True
+
+    if file_filter is None:
+        file_filter = no_filter
+
+    def compute_etag(resource: Path) -> str:
+        md = md5()
+        print(resource)
+        with resource.open('rb') as file:
+            while True:
+                chunk = file.read(0x10000)
+                if len(chunk):
+                    md.update(chunk)
+                else:
+                    break
+        return b64encode(md.digest()).decode()
+
+    if isinstance(root, str):
+        folder = Path(root)
+    else:
+        folder = root
+
+    prefix = PurePath(path)
+
+    async def handler(context: HttpContext, *_: Unpack[Any]) -> None:
+        requested = (PurePath(context.path)).relative_to(prefix)
+        resource = folder / requested
+        if not resource.is_relative_to(folder) or not resource.exists():
+            return await context.send_empty(404)
+
+        if await isfile(resource):
+
+            e_tag_header = ((Maybe.of_nullable(context.headers.get('if-none-match'))
+                             .filter(lambda it: len(it) > 0)
+                             .map(lambda it: it[-1])
+                             .map(parse_etag))
+                            .or_none())
+            current_etag = compute_etag(resource)
+
+            if e_tag_header == current_etag:
+                return await context.send_empty(304)
+            else:
+                mime_type = (Maybe.of(guess_type(resource.name))
+                             .map(lambda it: it[0])
+                             .or_else('application/octet-stream'))
+                return await context.send_file(200, resource, {
+                    'content-type': mime_type or 'application/octet-stream',
+                    'etag': 'W/' + current_etag,
+                    'cache-control': 'no-cache',
+                })
+        elif isdir(resource):
+            headers = {
+                'content-type': 'text/html'
+            }
+            await context.send_str(200, await directory_listing(prefix, requested, resource, favicon, file_filter),
+                                   headers)
+
+    return app.GET(path, True)(handler)
+
+
+async def directory_listing(prefix: PurePath,
+                            path_info: PurePath,
+                            path: PurePath,
+                            favicon: PurePath,
+                            file_filter: Callable[[PurePath], Awaitable[bool]]) -> str:
+    title = "Directory listing for %s" % path_info
+    result = "<!DOCTYPE html><html><head>"
+    if favicon:
+        result += f'<link rel="icon" type="image/x-icon" href="{favicon}">'
+    result += "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">"
+    result += "<title>" + title + "</title></head>"
+    result += "<body><h1>" + title + "</h1><hr>"
+    result += "<ul>"
+    if path_info != '/':
+        result += "<li><a href=\"../\"/>../</li>"
+
+    async def ls(entry_filter: Callable[[PurePath], Awaitable[bool]]) -> AsyncGenerator[str, Any]:
+        async def result():
+            for entry in sorted(await listdir(path)):
+                if await entry_filter(path / entry):
+                    yield entry
+
+        return result()
+
+    async for entry in await ls(isdir):
+        result += '<li><a href="' + entry + '/' + '"/>' + entry + '/' + '</li>'
+
+    async def composite_file_filter(entry: PurePath) -> bool:
+        return await isfile(entry) and await file_filter(entry)
+
+    async for entry in await ls(composite_file_filter):
+        result += '<li><a href="' + entry + '"/>' + entry + '</li>'
+    return result