aiohttp-fast-url-dispatcher

What it is and what it does

aiohttp-fast-url-dispatcher provides a replacement URL router for aiohttp web applications that uses indexing instead of linear search to match incoming requests to route handlers. The default aiohttp UrlDispatcher performs a linear search through all registered routes on every request, which becomes a bottleneck when an application has many routes. FastUrlDispatcher maintains an index to enable constant-time or near-constant-time lookups, reducing dispatch overhead.

The package is designed to be a drop-in replacement: you can attach it to an existing aiohttp Application or pass it as the router when creating a new one. However, it was always intended as a temporary solution—the author notes that the optimization is expected to merge upstream into aiohttp 3.10, making this library obsolete. The project is now archived and no longer maintained.

Use it for:

• Optimize request routing in aiohttp applications with hundreds or thousands of registered routes.
• Reduce latency in high-throughput web services where route dispatch is a measurable bottleneck.
• Migrate from default aiohttp routing to indexed dispatch without rewriting application code.
• Evaluate indexed routing performance before aiohttp 3.10 adoption.

Worth the install?

AI-flagged interpretation of the facts on this page — verify before relying

Replaces aiohttp's default URL dispatcher with an indexed implementation for faster route matching in applications with many routes.

No. The project is archived and abandoned as of July 2024. The author explicitly states it will become obsolete with aiohttp 3.10, and that version may already be available. Install only if you are running an older aiohttp version and have measured routing dispatch as a real performance bottleneck; otherwise, wait for or upgrade to aiohttp 3.10+ where this optimization is expected to be built in.

Install

aiohttp-fast-url-dispatcher on PyPI

pip install aiohttp-fast-url-dispatcher

uv add aiohttp-fast-url-dispatcher

poetry add aiohttp-fast-url-dispatcher

Installing aiohttp-fast-url-dispatcher

Before you install

Low install friction with a single dependency on aiohttp. However, the project is archived and abandoned as of July 2024, with no maintenance expected. The library was designed as a temporary optimization pending upstream changes to aiohttp 3.10.

License in practice

Licensed under Apache Software License (permissive), allowing commercial and private use with minimal restrictions.

Quickstart

pip install aiohttp-fast-url-dispatcher

from aiohttp_fast_url_dispatcher import FastUrlDispatcher, attach_fast_url_dispatcher
from aiohttp import web

dispatcher = FastUrlDispatcher()
app = web.Application()
attach_fast_url_dispatcher(app, dispatcher)

Requires aiohttp as a runtime dependency; static routes take precedence over dynamic (parameterized) routes when both match the same URL.

Verify before relying

• Whether aiohttp 3.10 has been released and whether this package's optimizations are now redundant or superseded.
• Performance improvement magnitude in real-world applications with varying route counts.
• Compatibility with recent aiohttp versions beyond 3.9.

Package facts

Evidence: aiohttp_fast_url_dispatcher-0.3.1-py3-none-any.whl

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