Drop rfc3986 dep, clean up internals

- Replace rfc3986 with stdlib urllib.parse
- Remove deprecated status code aliases (resume_incomplete/resume)
  that were marked for removal in 3.0
- Remove private ThreadPoolExecutor API usage in BackgroundQueue
- Clean up stale comments (old Starlette PR refs, requests attribution)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

responder/background.py

@@ -16,9 +16,6 @@ class BackgroundQueue:
         self.results = []
 
     def run(self, f, *args, **kwargs):
-        self.pool._max_workers = self.n
-        self.pool._adjust_thread_count()
-
         f = self.pool.submit(f, *args, **kwargs)
         self.results.append(f)
         return f

responder/models.py

@@ -5,7 +5,7 @@ from http.cookies import SimpleCookie
 from urllib.parse import parse_qs
 
 import chardet
-import rfc3986
+from urllib.parse import urlparse
 from starlette.requests import Request as StarletteRequest
 from starlette.requests import State
 from starlette.responses import (
@@ -162,7 +162,7 @@ class Request:
     @property
     def url(self):
         """The parsed URL of the Request."""
-        return rfc3986.urlparse(self.full_url)
+        return urlparse(self.full_url)
 
     @property
     def cookies(self):

responder/staticfiles.py

@@ -2,19 +2,7 @@ from starlette.staticfiles import StaticFiles as StarletteStaticFiles
 
 
 class StaticFiles(StarletteStaticFiles):
-    """
-    Extension to Starlette's `StaticFiles`.
-
-    I've created an issue to discuss allowing multiple directories in
-    Starlette's `StaticFiles`.
-
-    https://github.com/encode/starlette/issues/625
-
-    I've also made a PR to add this method to Starlette StaticFiles
-    Once accepted we will remove this.
-
-    https://github.com/encode/starlette/pull/626
-    """
+    """Extension to Starlette's StaticFiles with support for multiple directories."""
 
     def add_directory(self, directory: str) -> None:
         self.all_directories = [*self.all_directories, *self.get_directories(directory)]

responder/status_codes.py

@@ -1,5 +1,3 @@
-# from: https://github.com/requests/requests/blob/master/requests/status_codes.py
-
 codes = {
     # Informational.
     100: ("continue",),
@@ -26,11 +24,7 @@ codes = {
     305: ("use_proxy",),
     306: ("switch_proxy",),
     307: ("temporary_redirect", "temporary_moved", "temporary"),
-    308: (
-        "permanent_redirect",
-        "resume_incomplete",
-        "resume",
-    ),  # These 2 to be removed in 3.0
+    308: ("permanent_redirect",),
     # Client Error.
     400: ("bad_request", "bad"),
     401: ("unauthorized",),

setup.py

@@ -17,7 +17,6 @@ required = [
     "chardet",
     "marshmallow",
     "python-multipart",
-    "rfc3986",
     "servestatic",
     "starlette[full]>=0.40",
     "uvicorn[standard]",