Pingora Rust Framework for High-Performance Proxies

February 18, 2025

Pingora is an open-source Rust framework developed by Cloudflare for building high-performance network services, HTTP proxies, load balancers, and programmable gateways. Designed around asynchronous Rust, it provides developers with components for handling large volumes of network traffic while prioritising performance, reliability, and memory safety.

Cloudflare developed Pingora to support its own global network infrastructure. The framework has powered services handling more than 40 million HTTP requests per second, demonstrating its ability to operate in demanding production environments. It is also available to developers who want to build customised proxy infrastructure instead of relying entirely on traditional solutions.

Key Features of Pingora

Pingora provides reusable networking components and programmable APIs for building modern proxy services. Its main capabilities include:

HTTP proxying: Supports HTTP/1 and HTTP/2 proxying between clients and upstream services.
TLS integration: Provides TLS support through libraries such as OpenSSL and BoringSSL, with Rustls support available in experimental or version-dependent configurations.
gRPC and WebSockets: Supports proxying workloads that use these communication protocols.
Load balancing: Includes configurable load-balancing strategies and mechanisms for handling upstream failures.
Observability: Can integrate with monitoring and telemetry systems, including Prometheus and OpenTelemetry.
Graceful reloads: Supports configuration and service updates designed to minimise disruption.
Connection management: Provides connection reuse and pooling features that help reduce the overhead of repeated network connections.

Why Developers Choose Pingora

Memory Safety with Rust

Pingora is written in Rust, which provides compile-time protections against many common memory-safety problems. This can reduce risks associated with memory corruption and unsafe memory handling that frequently affect network services written in lower-level languages.

Rust does not eliminate every security risk. Developers still need to address application logic, dependency vulnerabilities, configuration errors, and unsafe code paths.

Performance and Resource Efficiency

Pingora uses asynchronous processing and a multithreaded architecture to handle concurrent network workloads. Its connection reuse capabilities can also reduce repeated connection setup and TLS handshake costs.

Cloudflare has reported substantial CPU and memory efficiency improvements compared with its previous proxy infrastructure. However, performance gains depend on workload characteristics, configuration, hardware, and the proxy implementation being compared. Results from Cloudflare’s environment should not be treated as guaranteed improvements for every deployment.

Programmable Proxy Architecture

One of Pingora’s main strengths is its customisation model. Developers can implement application-specific logic for request handling, response processing, routing, caching, and upstream selection.

This makes it useful for more than basic reverse proxying. Teams can build specialised API gateways, service proxies, traffic-management systems, and load balancers around their own requirements.

Pingora Crates and Components

Pingora is organised into multiple Rust crates, allowing developers to use the components relevant to their applications.

pingora: Core framework functionality for building network services and proxies.
pingora-load-balancing: Components for distributing requests across upstream servers.
pingora-memory-cache: Memory-based caching functionality.
pingora-openssl: OpenSSL-related integration for TLS and secure connections.
pingora-core: Core networking and service infrastructure used by the framework.

Crate availability and API details can change between releases. Developers should consult the current API documentation before selecting dependencies or implementing production services.

Platform Support and Build Requirements

Pingora primarily targets Linux environments. The original project documentation also mentions experimental Windows compatibility, which should not be confused with full production support.

Building the framework requires a compatible Rust toolchain. Some build configurations also depend on Clang and Perl 5, particularly where native dependencies or specific TLS integrations are involved.

The project follows a minimum supported Rust version policy that is periodically updated. The Rust 1.72 requirement mentioned in older documentation is historical and should not be assumed to represent the current minimum version. Check the repository and release notes for the toolchain requirements of the version you intend to use.

Common Use Cases

Pingora is suitable for infrastructure projects that need control over how network traffic is processed and distributed. Common applications include:

Building custom reverse proxies and HTTP gateways.
Distributing traffic across backend services.
Implementing specialised routing and failover policies.
Developing high-throughput network services.
Adding custom caching and request-processing logic.
Creating infrastructure for microservices and distributed applications.

Teams managing web infrastructure can also explore our guide to essential NGINX commands for working with a widely used web server and reverse proxy.

Open-Source Development and Documentation

Pingora is released under the Apache License 2.0, allowing developers to inspect, modify, and build upon the framework under the terms of the licence. Its documentation includes guidance for creating proxy services, configuring upstream connections, implementing custom request logic, and working with load-balancing components.

Before adopting Pingora, review its current release status, supported platforms, API stability, and operational requirements. Its flexibility makes it a useful foundation for custom network infrastructure, but production deployments still require careful testing, monitoring, and security reviews.