ASGI Compression

A framework and platform-independent compression middleware for ASGI applications.

✨ Features

• 🚀 Framework Independent - Works with any ASGI-compatible framework (FastAPI, Starlette, Litestar, Django, Falcon, etc.)
• 📦 Multiple Compression Algorithms - Supports gzip, brotli, and zstandard compression algorithms
• 🔄 Content Negotiation - Automatically selects the best compression algorithm based on the client's Accept-Encoding header
• 🛠️ Fully Configurable - Control minimum size for compression, compression levels, and more
• 📏 Minimal Dependencies - Single external dependency (multidict) apart from optional compression libraries
• 📝 Fully Typed - Complete type annotations for excellent IDE support and code safety
• 🐍 Wide Python Support - Compatible with Python 3.9 to 3.13
• 🔍 Streaming Support - Efficiently compresses both standard and streaming responses
• 🖥️ Platform Independent - Supports macOS, Linux, and Windows.

📥 Installation

Install the package with pip:

# Basic installation (includes gzip compression)
pip install asgi-compression

# With gzip and brotli support
pip install asgi-compression[br]

# With gzip and zstandard support
pip install asgi-compression[zstd]

# With gzip, brotli and zstandard support
pip install asgi-compression[all]

🚀 Usage

Basic Example

from asgi_compression import CompressionMiddleware, GzipAlgorithm

app = ...  # Your ASGI application

# Apply gzip compression with default settings
app = CompressionMiddleware(
    app=app,
    algorithms=[GzipAlgorithm()],
)

Multiple Algorithms Example

from asgi_compression import (
    BrotliAlgorithm, 
    CompressionMiddleware, 
    GzipAlgorithm, 
    ZstdAlgorithm
)

app = ...  # Your ASGI application

# Apply multiple compression algorithms in order of preference
app = CompressionMiddleware(
    app=app,
    algorithms=[
        BrotliAlgorithm(),  # Brotli will be used if the client supports it
        ZstdAlgorithm(),    # Zstandard will be used as a fallback
        GzipAlgorithm(),    # Gzip as a last resort
    ],
    minimum_size=1000,      # Only compress responses larger than 1KB
)

Framework-Specific Examples

FastAPI

from fastapi import FastAPI
from asgi_compression import CompressionMiddleware, GzipAlgorithm, BrotliAlgorithm

app = FastAPI()

@app.get("/")
async def read_root():
    return {"Hello": "World"}

# Apply compression middleware
app.add_middleware(
    CompressionMiddleware,
    algorithms=[BrotliAlgorithm(), GzipAlgorithm()],
)

Starlette

from starlette.applications import Starlette
from starlette.responses import JSONResponse
from starlette.routing import Route
from asgi_compression import CompressionMiddleware, GzipAlgorithm

async def homepage(request):
    return JSONResponse({"hello": "world"})

routes = [
    Route("/", homepage)
]

app = Starlette(routes=routes)
app = CompressionMiddleware(app=app, algorithms=[GzipAlgorithm()])

Litestar

from litestar import Litestar, get
from asgi_compression import CompressionMiddleware, BrotliAlgorithm

@get("/")
async def homepage() -> dict:
    return {"hello": "world"}

app = Litestar(route_handlers=[homepage])
app = CompressionMiddleware(app=app, algorithms=[BrotliAlgorithm()])

🙌 Inspired by

This project was brought to life thanks to inspiration from:

• Startlette's Gzip middleware
• brotli-asgi
• zstd-asgi

Cudos to devs & maintainers of those amazing libraries!

📜 License

This project is licensed under the terms of the MIT license.