Sozu

Sōzu is an open-source, fast and lightweight HTTP reverse proxy written in Rust, designed for high-performance traffic management in immutable infrastructure environments. It is configurable at runtime through a protobuf-based IPC protocol without requiring restarts, making it ideal for always-up deployments. Sōzu supports TLS termination, load balancing, and dynamic cluster configuration, and is developed by the sozu-proxy open-source organization on GitHub.

3 APIs 0 Features

ProxyReverse ProxyLoad BalancingRustOpen Source

APIs

Sozu Command API

The Sozu Command API provides programmatic control of the Sōzu HTTP reverse proxy at runtime. External tools communicate with the Sozu main process through a secure Unix socket ...

Sozu ACME Integration

The Sozu ACME integration automates TLS certificate requests from Let's Encrypt and other ACME-enabled certificate authorities. Originally a standalone tool in the sozu-acme rep...

Sozu Command Futures API

The sozu-command-futures library provides a futures-based async Rust API for configuring the Sōzu HTTP reverse proxy programmatically. It wraps the low-level IPC protocol in an ...

Pricing Plans

Sozu Plans Pricing

3 plans

PLANS

Rate Limits

Sozu Rate Limits

5 limits

RATE LIMITS

FinOps

Sozu Finops

FINOPS

Semantic Vocabularies

Sozu Context

8 classes · 16 properties

JSON-LD

JSON Structure

Sozu Configuration Structure

0 properties

JSON STRUCTURE

Example Payloads

Sozu Cluster Example

6 fields

EXAMPLE

Sozu Frontend Example

7 fields

EXAMPLE

Resources

GitHubOrganization

Integration Tests

Sources

aid: sozu
name: Sozu
description: Sōzu is an open-source, fast and lightweight HTTP reverse proxy written in Rust, designed for high-performance
  traffic management in immutable infrastructure environments. It is configurable at runtime through a protobuf-based IPC
  protocol without requiring restarts, making it ideal for always-up deployments. Sōzu supports TLS termination, load balancing,
  and dynamic cluster configuration, and is developed by the sozu-proxy open-source organization on GitHub.
url: https://raw.githubusercontent.com/api-evangelist/sozu/refs/heads/main/apis.yml
created: '2026-03-27'
modified: '2026-05-02'
specificationVersion: '0.19'
tags:
- Proxy
- Reverse Proxy
- Load Balancing
- Rust
- Open Source
apis:
- aid: sozu:sozu-command-api
  name: Sozu Command API
  description: The Sozu Command API provides programmatic control of the Sōzu HTTP reverse proxy at runtime. External tools
    communicate with the Sozu main process through a secure Unix socket using a protobuf-based binary protocol (IPC). The
    sozu-command-lib crate ships the protobuf schema, configuration parser, replicated state, channels, and file descriptor
    passing helpers. This enables dynamic cluster configuration, certificate management, and backend routing changes without
    restarts.
  humanURL: https://docs.sozu.io/
  baseURL: https://github.com/sozu-proxy/sozu
  tags:
  - Proxy
  - Command API
  - Protobuf
  - Runtime Configuration
  properties:
  - type: Documentation
    url: https://docs.sozu.io/
  - type: GitHub
    url: https://github.com/sozu-proxy/sozu
  - type: GettingStarted
    url: https://docs.sozu.io/getting-started/
  - type: Configuration
    url: https://github.com/sozu-proxy/sozu/blob/main/doc/configure.md
  - type: How To Use
    url: https://github.com/sozu-proxy/sozu/blob/main/doc/how_to_use.md
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/sozu/refs/heads/main/json-schema/sozu-cluster-schema.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/sozu/refs/heads/main/json-schema/sozu-frontend-schema.json
- aid: sozu:sozu-acme-api
  name: Sozu ACME Integration
  description: The Sozu ACME integration automates TLS certificate requests from Let's Encrypt and other ACME-enabled certificate
    authorities. Originally a standalone tool in the sozu-acme repository, it has been integrated directly into the main Sōzu
    binary and is available as a command-line feature.
  humanURL: https://github.com/sozu-proxy/sozu-acme
  tags:
  - TLS
  - Certificates
  - ACME
  - Let's Encrypt
  properties:
  - type: GitHub
    url: https://github.com/sozu-proxy/sozu-acme
- aid: sozu:sozu-command-futures-api
  name: Sozu Command Futures API
  description: The sozu-command-futures library provides a futures-based async Rust API for configuring the Sōzu HTTP reverse
    proxy programmatically. It wraps the low-level IPC protocol in an ergonomic async interface for Rust applications.
  humanURL: https://github.com/sozu-proxy/sozu-command-futures
  tags:
  - Proxy
  - Rust
  - Async
  - Command API
  properties:
  - type: GitHub
    url: https://github.com/sozu-proxy/sozu-command-futures
common:
- type: DomainSecurity
  url: security/sozu-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/sozu-limited
- type: Website
  url: https://www.sozu.io/
- type: Documentation
  url: https://docs.sozu.io/
- type: GitHubOrganization
  url: https://github.com/sozu-proxy
- type: GitHubRepository
  url: https://github.com/sozu-proxy/sozu
- type: ReleaseNotes
  url: https://github.com/sozu-proxy/sozu/releases
- type: Dashboard
  url: https://github.com/sozu-proxy/dashboard
- type: Integration Tests
  url: https://github.com/sozu-proxy/sozu-integration-tests
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/sozu/refs/heads/main/json-ld/sozu-context.jsonld
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/sozu/refs/heads/main/vocabulary/sozu-vocabulary.yml
maintainers:
- FN: API Evangelist
  email: info@apievangelist.com