---
id: connect-python
version: "0.9.0"
license: Apache-2.0
license_treatment: permissive
maintenance: active
---

# connect-python — Server and client runtime library for Connect RPC

License: permissive · Maintenance: active · Downloads: 1.4M/mo

## What it is and what it does

connect-python is a Python implementation of Connect, a Protobuf RPC framework that runs over standard HTTP/1.1 and HTTP/2. It provides both client and server libraries, with a protoc plugin that generates typed stubs and interfaces from .proto definitions. The package supports synchronous and asynchronous clients, WSGI and ASGI server implementations, and all streaming patterns (unary, server streaming, client streaming, and bidirectional).

The library emphasizes type safety with full type annotations, includes built-in compression (gzip, brotli, zstd), and supports server-side and client-side interceptors for cross-cutting concerns. It is verified against the official Connect conformance test suite. Typical use involves generating code from protobuf definitions, then implementing service handlers or making client calls using the generated interfaces.

Use it for:

- Build typed RPC services using protobuf definitions with automatic client stub and server interface generation.
- Implement bidirectional streaming communication between services over HTTP/2 with full-duplex support.
- Integrate Connect RPC into existing Python web frameworks via WSGI or ASGI adapters.
- Create microservices with compression and interceptor support for authentication, logging, or metrics.
- Migrate from gRPC while maintaining protobuf-based service definitions and type safety.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides Python client and server libraries for Connect RPC, a Protobuf-based RPC framework that works over HTTP/1.1 and HTTP/2, with support for synchronous and asynchronous code, streaming, and compression.

Yes. The package is actively maintained, has no known vulnerabilities, low install friction, and fills a genuine need for a modern Protobuf RPC framework in Python. It is suitable for production use in microservices, though the Beta status suggests you should monitor releases. Choose it if you want typed RPC with HTTP/2 streaming and prefer Connect's simpler protocol over gRPC.

## Install

pip install connect-python
uv add connect-python
poetry add connect-python

## Installing connect-python

Before you install: Low friction: pure Python wheel with only two runtime dependencies (protobuf and pyqwest). Actively maintained with recent commits and no known vulnerabilities.

License in practice: Apache-2.0 permissive license allows commercial and private use with minimal restrictions; suitable for most projects.

Quickstart:

pip install connect-python

import connect_python

# Generated code from protoc plugin creates typed client stubs
# and server interfaces from .proto files

Requires Python 3.10 or later; generated client and server code requires running protoc with the connect-python plugin on your .proto files first.

Verify before relying:

- Performance characteristics compared to gRPC or other RPC frameworks under typical workloads.
- Maturity level and production readiness beyond Beta classification.
- Whether gRPC-Web support is planned or available through an alternative package.

## Package facts

- License: Apache-2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 1.4M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

protobuf rpc client server, connect rpc python, grpc alternative http, async rpc framework, protobuf code generation, streaming rpc, typed rpc stubs, rpc-framework, protobuf, async-io

[View on SkillFed](https://skillfed.io/packages/connect-python) · [View on PyPI](https://pypi.org/project/connect-python/)