diff --git a/starlette/middleware/httpsredirect.py b/starlette/middleware/httpsredirect.py
index 13f3a70..7f646ed 100644
--- a/starlette/middleware/httpsredirect.py
+++ b/starlette/middleware/httpsredirect.py
@@ -13,7 +13,7 @@ class HTTPSRedirectMiddleware:
             redirect_scheme = {"http": "https", "ws": "wss"}[url.scheme]
             netloc = url.hostname if url.port in (80, 443) else url.netloc
             url = url.replace(scheme=redirect_scheme, netloc=netloc)
-            response = RedirectResponse(url, status_code=301)
+            response = RedirectResponse(url, status_code=308)
             await response(scope, receive, send)
         else:
             await self.app(scope, receive, send)
diff --git a/starlette/responses.py b/starlette/responses.py
index 13982db..a755d24 100644
--- a/starlette/responses.py
+++ b/starlette/responses.py
@@ -161,7 +161,7 @@ class UJSONResponse(JSONResponse):
 
 class RedirectResponse(Response):
     def __init__(
-        self, url: typing.Union[str, URL], status_code: int = 302, headers: dict = None
+        self, url: typing.Union[str, URL], status_code: int = 307, headers: dict = None
     ) -> None:
         super().__init__(content=b"", status_code=status_code, headers=headers)
         self.headers["location"] = quote_plus(str(url), safe=":/%#?&=@[]!$&'()*+,;")

Use "308 Permanent Redirect" for redirect slashes behavior.
Hi,
I stumbled upon a quirk in starlette that is not properly documented. It seems like all of my HTTP request to a route without trailing slash are being redirected to route with trailing slashes. Say I am hitting `http://hostname/mountpoint/api` it will be redirected (302) to `http://hostname/mountpoint/api/`. This messed up your api calls; if you call POST to `http://hostname/mountpoint/api` it will be redirected to GET `http://hostname/mountpoint/api/`.

I dig on the source and see this redirect_slashes flag and setting it to False fix this. I feel this behavior (the auto redirection) should be documented.
diff --git a/tests/middleware/test_https_redirect.py b/tests/middleware/test_https_redirect.py
index 15f1e3f..6a81ed3 100644
--- a/tests/middleware/test_https_redirect.py
+++ b/tests/middleware/test_https_redirect.py
@@ -19,20 +19,20 @@ def test_https_redirect_middleware():
 
     client = TestClient(app)
     response = client.get("/", allow_redirects=False)
-    assert response.status_code == 301
+    assert response.status_code == 308
     assert response.headers["location"] == "https://testserver/"
 
     client = TestClient(app, base_url="http://testserver:80")
     response = client.get("/", allow_redirects=False)
-    assert response.status_code == 301
+    assert response.status_code == 308
     assert response.headers["location"] == "https://testserver/"
 
     client = TestClient(app, base_url="http://testserver:443")
     response = client.get("/", allow_redirects=False)
-    assert response.status_code == 301
+    assert response.status_code == 308
     assert response.headers["location"] == "https://testserver/"
 
     client = TestClient(app, base_url="http://testserver:123")
     response = client.get("/", allow_redirects=False)
-    assert response.status_code == 301
+    assert response.status_code == 308
     assert response.headers["location"] == "https://testserver:123/"

pip install -e .[full]
parse_log_pytest
requirements.txt
pytest pytest-cov black
apt-get update apt-get install -y gcc
3.7
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
aiofiles==23.2.1
aiosqlite==0.19.0
autoflake==2.1.1
Babel==2.14.0
black==23.3.0
certifi @ file:///croot/certifi_1671487769961/work/certifi
charset-normalizer==3.4.1
click==8.1.8
colorama==0.4.6
coverage==7.2.7
databases==0.8.0
exceptiongroup==1.2.2
ghp-import==2.1.0
graphene==3.4.3
graphql-core==3.2.6
graphql-relay==3.2.0
greenlet==3.1.1
idna==3.10
importlib-metadata==6.7.0
iniconfig==2.0.0
isort==5.11.5
itsdangerous==2.1.2
Jinja2==3.1.6
Markdown==3.4.4
MarkupSafe==2.1.5
mergedeep==1.3.4
mkdocs==1.5.3
mkdocs-material==9.2.7
mkdocs-material-extensions==1.2
mypy==1.4.1
mypy-extensions==1.0.0
packaging==24.0
paginate==0.5.7
pathspec==0.11.2
platformdirs==4.0.0
pluggy==1.2.0
pyflakes==3.0.1
Pygments==2.17.2
pymdown-extensions==10.2.1
pytest==7.4.4
pytest-cov==4.1.0
python-dateutil==2.9.0.post0
python-multipart==0.0.8
pytz==2025.2
PyYAML==6.0.1
pyyaml_env_tag==0.1
regex==2022.10.31
requests==2.31.0
six==1.17.0
SQLAlchemy==1.4.54
-e git+https://github.com/encode/starlette.git@b2f9f4359b93a9f941779c575af764019e5183c7#egg=starlette
tomli==2.0.1
typed-ast==1.5.5
typing_extensions==4.7.1
ujson==5.7.0
urllib3==2.0.7
watchdog==3.0.0
zipp==3.15.0

name: starlette
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2022.12.7=py37h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=22.3.1=py37h06a4308_0
  - python=3.7.16=h7a1cb2a_0
  - readline=8.2=h5eee18b_0
  - setuptools=65.6.3=py37h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.38.4=py37h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - aiofiles==23.2.1
      - aiosqlite==0.19.0
      - autoflake==2.1.1
      - babel==2.14.0
      - black==23.3.0
      - charset-normalizer==3.4.1
      - click==8.1.8
      - colorama==0.4.6
      - coverage==7.2.7
      - databases==0.8.0
      - exceptiongroup==1.2.2
      - ghp-import==2.1.0
      - graphene==3.4.3
      - graphql-core==3.2.6
      - graphql-relay==3.2.0
      - greenlet==3.1.1
      - idna==3.10
      - importlib-metadata==6.7.0
      - iniconfig==2.0.0
      - isort==5.11.5
      - itsdangerous==2.1.2
      - jinja2==3.1.6
      - markdown==3.4.4
      - markupsafe==2.1.5
      - mergedeep==1.3.4
      - mkdocs==1.5.3
      - mkdocs-material==9.2.7
      - mkdocs-material-extensions==1.2
      - mypy==1.4.1
      - mypy-extensions==1.0.0
      - packaging==24.0
      - paginate==0.5.7
      - pathspec==0.11.2
      - platformdirs==4.0.0
      - pluggy==1.2.0
      - pyflakes==3.0.1
      - pygments==2.17.2
      - pymdown-extensions==10.2.1
      - pytest==7.4.4
      - pytest-cov==4.1.0
      - python-dateutil==2.9.0.post0
      - python-multipart==0.0.8
      - pytz==2025.2
      - pyyaml==6.0.1
      - pyyaml-env-tag==0.1
      - regex==2022.10.31
      - requests==2.31.0
      - six==1.17.0
      - sqlalchemy==1.4.54
      - tomli==2.0.1
      - typed-ast==1.5.5
      - typing-extensions==4.7.1
      - ujson==5.7.0
      - urllib3==2.0.7
      - watchdog==3.0.0
      - zipp==3.15.0
prefix: /opt/conda/envs/starlette

tests/middleware/test_https_redirect.py::test_https_redirect_middleware
starlette/middleware/httpsredirect.py starlette/responses.py
starlette/middleware/httpsredirect.py starlette/responses.py