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Add auth, WebSocket, middleware, config guides. Examples and changelog.

Browse Source 
New documentation pages:
- Authentication: API keys, JWT tokens, session auth, custom exceptions
- WebSocket Tutorial: echo server, chat room, HTML client, data formats
- Writing Middleware: hooks vs middleware, Starlette integration, ordering
- Configuration: env vars, .env files, secret keys, debug mode, production setup

Also:
- Complete working example at end of quickstart with cross-references
- Three new example files: rest_api.py, websocket_chat.py, sse_stream.py
- Changelog updated for v3.2.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Kenneth Reitz
2026-03-22 13:56:35 -04:00
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CHANGELOG.md
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@@ -7,6 +7,44 @@ this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
## [Unreleased]
## [v3.2.0] - 2026-03-22
### Added
- Pydantic auto-validation: `request_model` validates input, returns 422 on failure
- Pydantic auto-serialization: `response_model` strips extra fields from responses
- Server-Sent Events: `@resp.sse` for real-time streaming
- `resp.stream_file()` for streaming large files without loading into memory
- `@api.after_request()` hooks
- `api.group("/prefix")` for route groups and API versioning
- `api.graphql("/path", schema=schema)` one-liner GraphQL setup
- `api = responder.API(request_id=True)` for automatic request ID generation
- Built-in rate limiter: `RateLimiter(requests=100, period=60).install(api)`
- MessagePack format support: `await req.media("msgpack")`
- `req.is_json`, `req.path_params`, `req.client` properties
- `api.exception_handler()` decorator for custom error handling
- Lifespan context manager support
- `uuid` and `path` route convertors
- PEP 561 `py.typed` marker
- Pydantic support for OpenAPI schema generation
### Changed
- Dependencies flattened: `pip install responder` gets everything
- Core deps reduced to starlette + uvicorn
- TestClient lazy-loaded (no httpx import in production)
- Before-request hooks can short-circuit by setting status code
- Removed poethepoet task runner
### Fixed
- Multipart parser losing headers when parts have multiple headers
- `url_for()` with typed route params (`{id:int}`)
- `resp.body` encoding crash on bytes content
- GraphQL text query missing `await`
- Streaming responses not sending Content-Type headers
- Python 3.9 compatibility for union type syntax
## [v3.0.0] - 2026-03-22
### Added
docs/source/guide-config.rst
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Configuration
=============
Every application needs different settings for different environments —
debug mode in development, real secrets in production, different database
URLs for testing. This guide covers how to manage configuration cleanly.
Environment Variables
---------------------
The simplest and most universal approach. Environment variables work
everywhere — locally, in Docker, on cloud platforms — and keep secrets
out of your source code::
import os
import responder
api = responder.API(
debug=os.getenv("DEBUG", "false").lower() == "true",
secret_key=os.environ["SECRET_KEY"],
cors=os.getenv("CORS_ENABLED", "false").lower() == "true",
)
Some variables Responder handles automatically:
- ``PORT`` — when set, the server binds to ``0.0.0.0`` on this port
Set variables in your shell::
$ export SECRET_KEY="your-secret-here"
$ export DEBUG=true
$ python app.py
Or in a ``.env`` file (don't commit this to git)::
SECRET_KEY=your-secret-here
DEBUG=true
Using .env Files
----------------
For local development, a ``.env`` file is convenient. Install
``python-dotenv`` and load it at the top of your app::
$ uv pip install python-dotenv
::
from dotenv import load_dotenv
load_dotenv()
import os
import responder
api = responder.API(
secret_key=os.environ["SECRET_KEY"],
)
Add ``.env`` to your ``.gitignore`` — never commit secrets.
Configuration Class Pattern
----------------------------
For larger applications, a configuration class keeps things organized::
import os
class Config:
SECRET_KEY = os.environ.get("SECRET_KEY", "dev-secret")
DEBUG = os.environ.get("DEBUG", "false").lower() == "true"
DATABASE_URL = os.environ.get("DATABASE_URL", "sqlite:///dev.db")
CORS_ORIGINS = os.environ.get("CORS_ORIGINS", "").split(",")
config = Config()
api = responder.API(
debug=config.DEBUG,
secret_key=config.SECRET_KEY,
cors=bool(config.CORS_ORIGINS[0]),
cors_params={"allow_origins": config.CORS_ORIGINS},
)
This makes it easy to see all your settings in one place.
Secret Key
----------
The ``secret_key`` is used to sign session cookies. If someone knows your
secret key, they can forge session data and impersonate any user.
Rules:
- **Never use the default** in production
- **Generate a random key**: ``python -c "import secrets; print(secrets.token_hex(32))"``
- **Store it in an environment variable**, not in code
- **Rotate it** if it's ever compromised (this invalidates all sessions)
::
api = responder.API(secret_key=os.environ["SECRET_KEY"])
Debug Mode
----------
Debug mode controls error page behavior:
- **On** (``debug=True``): detailed error pages with tracebacks. Never
use this in production — it exposes your source code.
- **Off** (``debug=False``): generic error pages. This is the default.
::
api = responder.API(debug=True) # development only
A common pattern is to read it from the environment::
api = responder.API(debug=os.getenv("DEBUG") == "true")
Allowed Hosts
-------------
In production, always set ``allowed_hosts`` to prevent Host header
attacks. This should match the domain names your application serves::
api = responder.API(
allowed_hosts=["example.com", "www.example.com"],
)
In development, you can use ``["*"]`` (the default) or specific local
addresses::
api = responder.API(allowed_hosts=["localhost", "127.0.0.1"])
Putting It All Together
-----------------------
A production-ready configuration setup::
import os
from dotenv import load_dotenv
load_dotenv()
import responder
api = responder.API(
debug=os.getenv("DEBUG", "false") == "true",
secret_key=os.environ["SECRET_KEY"],
allowed_hosts=os.getenv("ALLOWED_HOSTS", "*").split(","),
cors=bool(os.getenv("CORS_ORIGINS")),
cors_params={
"allow_origins": os.getenv("CORS_ORIGINS", "").split(","),
"allow_methods": ["GET", "POST", "PUT", "DELETE"],
},
)
With a ``.env`` file for local development::
SECRET_KEY=dev-secret-do-not-use-in-prod
DEBUG=true
ALLOWED_HOSTS=localhost,127.0.0.1
CORS_ORIGINS=http://localhost:3000
And environment variables set properly in production (via your cloud
platform's dashboard, Docker secrets, or a secrets manager).
docs/source/index.rst
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@@ -106,7 +106,11 @@ Python 3.9 and above. That's it.
tutorial-rest
tutorial-sqlalchemy
tutorial-auth
tutorial-websockets
tutorial-middleware
tutorial-flask
guide-config
.. toctree::
:maxdepth: 1
docs/source/quickstart.rst
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@@ -330,3 +330,49 @@ for lightweight use cases where you don't need a full message broker.
your application, which makes them fast to start but means CPU-intensive
work will block the event loop. For heavy computation, consider a proper
task queue.
Putting It All Together
-----------------------
Here's a complete, working Responder application that combines everything
from this guide::
import responder
api = responder.API()
@api.route("/")
def index(req, resp):
resp.text = "Welcome to the API"
@api.route("/hello/{name}")
def greet(req, resp, *, name):
resp.media = {"message": f"hello, {name}!"}
@api.route("/add/{a:int}/{b:int}")
def add(req, resp, *, a, b):
resp.media = {"result": a + b}
@api.route("/echo", methods=["POST"])
async def echo(req, resp):
data = await req.media()
resp.media = {"received": data}
if __name__ == "__main__":
api.run()
Save this as ``app.py``, run it with ``python app.py``, and try::
$ curl http://localhost:5042/
$ curl http://localhost:5042/hello/world
$ curl http://localhost:5042/add/3/4
$ curl -X POST http://localhost:5042/echo \
-H "Content-Type: application/json" -d '{"key": "value"}'
From here, explore the :doc:`tour` for the full range of features, or
jump into the tutorials:
- :doc:`tutorial-rest` — build a full CRUD API with validation
- :doc:`tutorial-sqlalchemy` — connect to a database
- :doc:`tutorial-auth` — add authentication
docs/source/tutorial-auth.rst
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Authentication
==============
Every API that handles user data needs authentication — a way to verify
who is making a request. This guide covers the most common patterns:
API keys, JWT tokens, and how to build reusable auth guards with
Responder's before-request hooks.
API Key Authentication
----------------------
The simplest approach. The client sends a secret key in a header, and
your server checks it against a known value. This is common for
server-to-server communication and simple APIs::
API_KEYS = {"sk-abc123", "sk-def456"}
@api.route(before_request=True)
def check_api_key(req, resp):
key = req.headers.get("X-API-Key")
if key not in API_KEYS:
resp.status_code = 401
resp.media = {"error": "Invalid or missing API key"}
Because the before-request hook sets ``resp.status_code``, the route
handler is skipped entirely for unauthorized requests. The client never
reaches your endpoint — the guard catches them first.
The client sends the key like this::
$ curl -H "X-API-Key: sk-abc123" http://localhost:5042/protected
Bearer Token Authentication
----------------------------
Bearer tokens are the standard for modern APIs. The client sends a token
in the ``Authorization`` header, and the server validates it. The most
common format is `JWT <https://jwt.io/>`_ (JSON Web Tokens).
Install PyJWT::
$ uv pip install pyjwt
Create a helper to encode and decode tokens::
import jwt
from datetime import datetime, timedelta
SECRET = "your-secret-key"
def create_token(user_id: int) -> str:
payload = {
"sub": user_id,
"exp": datetime.utcnow() + timedelta(hours=24),
}
return jwt.encode(payload, SECRET, algorithm="HS256")
def verify_token(token: str) -> dict | None:
try:
return jwt.decode(token, SECRET, algorithms=["HS256"])
except jwt.InvalidTokenError:
return None
Add a login endpoint that issues tokens, and a before-request hook that
verifies them::
@api.route("/login", methods=["POST"])
async def login(req, resp):
data = await req.media()
# In a real app, check credentials against a database
if data.get("username") == "admin" and data.get("password") == "secret":
token = create_token(user_id=1)
resp.media = {"token": token}
else:
resp.status_code = 401
resp.media = {"error": "Invalid credentials"}
@api.route(before_request=True)
def auth_guard(req, resp):
# Skip auth for the login endpoint itself
if req.url.path == "/login":
return
auth = req.headers.get("Authorization", "")
if not auth.startswith("Bearer "):
resp.status_code = 401
resp.media = {"error": "Missing bearer token"}
return
token = auth[7:] # Strip "Bearer "
payload = verify_token(token)
if payload is None:
resp.status_code = 401
resp.media = {"error": "Invalid or expired token"}
return
# Store the authenticated user on the request state
req.state.user_id = payload["sub"]
Now any route can access the authenticated user::
@api.route("/me")
def get_me(req, resp):
resp.media = {"user_id": req.state.user_id}
The client flow:
1. ``POST /login`` with credentials → receive a token
2. Include ``Authorization: Bearer <token>`` on every subsequent request
3. The token expires after 24 hours — the client must log in again
Skipping Auth for Public Routes
--------------------------------
The example above skips auth for ``/login`` by checking the path. For
more control, you can use a set of public paths::
PUBLIC_PATHS = {"/login", "/signup", "/health", "/docs", "/schema.yml"}
@api.route(before_request=True)
def auth_guard(req, resp):
if req.url.path in PUBLIC_PATHS:
return
# ... check token
Custom Exception for Auth Errors
---------------------------------
For cleaner code, define a custom exception and register a handler::
class AuthError(Exception):
def __init__(self, message="Unauthorized", status_code=401):
self.message = message
self.status_code = status_code
@api.exception_handler(AuthError)
async def handle_auth_error(req, resp, exc):
resp.status_code = exc.status_code
resp.media = {"error": exc.message}
Now your auth guard can simply raise::
@api.route(before_request=True)
def auth_guard(req, resp):
if req.url.path in PUBLIC_PATHS:
return
if "Authorization" not in req.headers:
raise AuthError("Missing authorization header")
Using Sessions for Web Apps
----------------------------
For traditional web applications (with HTML pages and forms), cookie-based
sessions are simpler than tokens. The browser handles cookies automatically
— no client-side token management needed::
@api.route("/login", methods=["POST"])
async def login(req, resp):
data = await req.media("form")
if data["username"] == "admin" and data["password"] == "secret":
resp.session["user"] = data["username"]
api.redirect(resp, location="/dashboard")
else:
resp.status_code = 401
resp.html = "<p>Invalid credentials</p>"
@api.route("/dashboard")
def dashboard(req, resp):
user = req.session.get("user")
if not user:
api.redirect(resp, location="/login")
return
resp.html = f"<h1>Welcome, {user}!</h1>"
@api.route("/logout")
def logout(req, resp):
resp.session.clear()
api.redirect(resp, location="/login")
Remember to set a proper secret key::
api = responder.API(secret_key="your-production-secret-key")
The session data is signed (not encrypted) — users can read it but
can't tamper with it. Don't store sensitive data like passwords in
sessions.
docs/source/tutorial-middleware.rst
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Writing Middleware
=================
Middleware sits between the server and your route handlers, processing
every request and response that flows through your application. It's the
right tool for cross-cutting concerns — things that apply to *all*
requests, not just specific routes.
Common middleware use cases:
- Request logging and timing
- Authentication and authorization
- Adding security headers
- Request ID generation
- Rate limiting
- Response compression (built-in)
Hooks vs. Middleware
--------------------
Responder gives you two levels of request processing:
**Hooks** (``before_request`` / ``after_request``) run inside Responder's
routing layer. They receive Responder's ``req`` and ``resp`` objects and
are the simplest way to add behavior::
@api.route(before_request=True)
def add_header(req, resp):
resp.headers["X-Powered-By"] = "Responder"
@api.after_request()
def log_request(req, resp):
print(f"{req.method} {req.url.path} -> {resp.status_code}")
**Middleware** runs at the ASGI level, wrapping the entire application.
It's more powerful but more complex — you work with raw ASGI scopes
instead of Responder objects. Use middleware when you need to process
requests *before* they reach Responder's routing, or when you need to
integrate with Starlette middleware.
Using Starlette Middleware
--------------------------
Responder is built on Starlette, so any Starlette middleware works
out of the box::
from starlette.middleware.base import BaseHTTPMiddleware
class TimingMiddleware(BaseHTTPMiddleware):
async def dispatch(self, request, call_next):
import time
start = time.time()
response = await call_next(request)
duration = time.time() - start
response.headers["X-Response-Time"] = f"{duration:.3f}s"
return response
api.add_middleware(TimingMiddleware)
The ``dispatch`` method receives a Starlette ``Request`` and a
``call_next`` function. Call ``call_next(request)`` to pass the request
to the next middleware (or to your route handler). The return value is
a Starlette ``Response`` that you can modify before it's sent.
Built-in Middleware
-------------------
Responder configures several middleware components automatically:
- **GZipMiddleware** — compresses responses larger than 500 bytes
- **TrustedHostMiddleware** — validates the ``Host`` header
- **ServerErrorMiddleware** — catches unhandled exceptions
- **ExceptionMiddleware** — routes exceptions to your handlers
- **SessionMiddleware** — manages signed cookie sessions
Optional middleware you can enable:
- **CORSMiddleware** — ``api = responder.API(cors=True)``
- **HTTPSRedirectMiddleware** — ``api = responder.API(enable_hsts=True)``
Adding Third-Party Middleware
-----------------------------
Any ASGI middleware can be added with ``api.add_middleware()``::
from some_package import SomeMiddleware
api.add_middleware(SomeMiddleware, option1="value", option2=True)
Keyword arguments are passed to the middleware's constructor.
Middleware Order
----------------
Middleware wraps your application like layers of an onion. The *last*
middleware added is the *outermost* layer — it sees the request first
and the response last.
Responder's built-in middleware stack (from outermost to innermost):
1. SessionMiddleware
2. ServerErrorMiddleware
3. CORSMiddleware (if enabled)
4. TrustedHostMiddleware
5. HTTPSRedirectMiddleware (if enabled)
6. GZipMiddleware
7. ExceptionMiddleware
8. Your routes
When you call ``api.add_middleware()``, your middleware is added *outside*
the existing stack. Keep this in mind for ordering dependencies — if
middleware A depends on middleware B having run first, add B before A.
When to Use What
-----------------
- **Simple header additions, logging, auth checks** → use hooks
- **Response transformation, timing, third-party integrations** → use middleware
- **Rate limiting** → use the built-in ``RateLimiter`` (it uses hooks internally)
- **Request ID** → use ``api = responder.API(request_id=True)``
Start with hooks. They're simpler and cover most cases. Graduate to
middleware when hooks aren't enough.
docs/source/tutorial-websockets.rst
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WebSocket Tutorial
==================
HTTP is request-response — the client asks, the server answers, and the
connection closes. WebSockets upgrade that into a persistent, bidirectional
channel where both sides can send messages at any time. This is what powers
chat apps, live dashboards, multiplayer games, and collaborative editors.
This tutorial builds a simple chat room to show how WebSockets work in
Responder.
How WebSockets Work
-------------------
1. The client sends a normal HTTP request with an ``Upgrade: websocket``
header.
2. The server accepts the upgrade and the connection switches protocols.
3. Both sides can now send messages freely — no more request/response.
4. Either side can close the connection at any time.
In Responder, WebSocket routes receive a ``ws`` object instead of
``req`` and ``resp``. The ``ws`` object has methods for accepting the
connection, sending and receiving data, and closing.
Echo Server
-----------
The simplest WebSocket — echoes everything back::
@api.route("/ws", websocket=True)
async def echo(ws):
await ws.accept()
while True:
data = await ws.receive_text()
await ws.send_text(f"Echo: {data}")
The ``await ws.accept()`` call completes the WebSocket handshake. After
that, you're in a loop — receive a message, send a response.
Test it with a WebSocket client::
$ pip install websocket-client
$ python -c "
import websocket
ws = websocket.create_connection('ws://localhost:5042/ws')
ws.send('hello')
print(ws.recv()) # Echo: hello
ws.close()
"
Chat Room
---------
A chat room needs to broadcast messages to all connected clients. We keep
a set of active connections and iterate through them when someone sends
a message::
connected = set()
@api.route("/chat", websocket=True)
async def chat(ws):
await ws.accept()
connected.add(ws)
try:
while True:
message = await ws.receive_text()
# Broadcast to all connected clients
for client in connected:
await client.send_text(message)
except Exception:
pass
finally:
connected.discard(ws)
The ``try/finally`` block ensures we remove disconnected clients from
the set, even if the connection drops unexpectedly.
Data Formats
------------
WebSockets support three data formats:
**Text** — plain strings::
await ws.send_text("hello")
message = await ws.receive_text()
**JSON** — auto-serialized Python objects::
await ws.send_json({"type": "update", "data": [1, 2, 3]})
message = await ws.receive_json()
**Binary** — raw bytes, useful for images, audio, or custom protocols::
await ws.send_bytes(b"\x00\x01\x02")
data = await ws.receive_bytes()
HTML Client
-----------
Here's a minimal HTML page that connects to the chat room. The browser's
built-in ``WebSocket`` API handles everything — no libraries needed:
.. code-block:: html
<!DOCTYPE html>
<html>
<body>
<div id="messages"></div>
<input id="input" placeholder="Type a message..." />
<script>
const ws = new WebSocket("ws://localhost:5042/chat");
const messages = document.getElementById("messages");
const input = document.getElementById("input");
ws.onmessage = (event) => {
const p = document.createElement("p");
p.textContent = event.data;
messages.appendChild(p);
};
input.addEventListener("keypress", (e) => {
if (e.key === "Enter") {
ws.send(input.value);
input.value = "";
}
});
</script>
</body>
</html>
Save this as ``static/index.html`` and serve it with Responder's
built-in static file support.
Before-Request Hooks for WebSockets
------------------------------------
You can run code before a WebSocket connection is established, just like
HTTP before-request hooks. This is useful for authentication::
@api.before_request(websocket=True)
async def ws_auth(ws):
# Check for a token in the query string
# (WebSocket headers are limited in browsers)
await ws.accept()
WebSocket before-request hooks receive the ``ws`` object and must call
``await ws.accept()`` if they want the connection to proceed.
Testing WebSockets
------------------
Use Starlette's ``TestClient`` for WebSocket tests::
from starlette.testclient import TestClient
def test_echo():
client = TestClient(api)
with client.websocket_connect("/ws") as ws:
ws.send_text("hello")
assert ws.receive_text() == "Echo: hello"
The ``websocket_connect`` context manager handles the connection
lifecycle — it connects on enter and disconnects on exit.
examples/rest_api.py
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# Complete REST API example with Pydantic validation.
# https://responder.kennethreitz.org/tutorial-rest.html
import responder
from pydantic import BaseModel
class BookIn(BaseModel):
title: str
author: str
year: int
isbn: str | None = None
class BookOut(BaseModel):
id: int
title: str
author: str
year: int
isbn: str | None = None
api = responder.API(
title="Book Catalog",
version="1.0",
openapi="3.0.2",
docs_route="/docs",
)
books_db: dict[int, dict] = {}
next_id = 1
@api.route("/books", methods=["GET"])
def list_books(req, resp):
resp.media = list(books_db.values())
@api.route("/books", methods=["POST"], check_existing=False,
request_model=BookIn, response_model=BookOut)
async def create_book(req, resp):
global next_id
data = await req.media()
book = {"id": next_id, **data}
books_db[next_id] = book
next_id += 1
resp.media = book
resp.status_code = 201
@api.route("/books/{book_id:int}", methods=["GET"])
def get_book(req, resp, *, book_id):
if book_id not in books_db:
resp.status_code = 404
resp.media = {"error": f"Book {book_id} not found"}
return
resp.media = books_db[book_id]
@api.route("/books/{book_id:int}", methods=["DELETE"], check_existing=False)
def delete_book(req, resp, *, book_id):
if book_id not in books_db:
resp.status_code = 404
resp.media = {"error": f"Book {book_id} not found"}
return
del books_db[book_id]
resp.status_code = 204
if __name__ == "__main__":
api.run()
examples/sse_stream.py
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# Server-Sent Events streaming example.
# https://responder.kennethreitz.org/tour.html#server-sent-events-sse
import asyncio
import responder
api = responder.API()
@api.route("/")
def index(req, resp):
resp.html = """
<!DOCTYPE html>
<html>
<body>
<h1>SSE Stream</h1>
<div id="events"></div>
<script>
const source = new EventSource("/stream");
const events = document.getElementById("events");
source.onmessage = (e) => {
const p = document.createElement("p");
p.textContent = e.data;
events.appendChild(p);
};
</script>
</body>
</html>
"""
@api.route("/stream")
async def stream(req, resp):
@resp.sse
async def events():
for i in range(20):
yield {"data": f"Event #{i}"}
await asyncio.sleep(0.5)
if __name__ == "__main__":
api.run()
examples/websocket_chat.py
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# WebSocket chat room example.
# https://responder.kennethreitz.org/tutorial-websockets.html
import responder
api = responder.API()
connected = set()
@api.route("/")
def index(req, resp):
resp.html = """
<!DOCTYPE html>
<html>
<body>
<h1>Chat Room</h1>
<div id="messages" style="height:300px;overflow-y:scroll;border:1px solid #ccc;padding:10px;"></div>
<input id="input" placeholder="Type a message..." style="width:300px;" />
<script>
const ws = new WebSocket(`ws://${location.host}/chat`);
const messages = document.getElementById("messages");
const input = document.getElementById("input");
ws.onmessage = (e) => {
const p = document.createElement("p");
p.textContent = e.data;
messages.appendChild(p);
messages.scrollTop = messages.scrollHeight;
};
input.addEventListener("keypress", (e) => {
if (e.key === "Enter" && input.value) {
ws.send(input.value);
input.value = "";
}
});
</script>
</body>
</html>
"""
@api.route("/chat", websocket=True)
async def chat(ws):
await ws.accept()
connected.add(ws)
try:
while True:
message = await ws.receive_text()
for client in connected:
await client.send_text(message)
except Exception:
pass
finally:
connected.discard(ws)
if __name__ == "__main__":
api.run()