Hitch (software)
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| Hitch (software) | |
|---|---|
| Name | Hitch |
| Developer | Fastly |
| Initial release | 2012 |
| Operating system | Unix-like |
| Genre | TLS proxy, load balancer |
| License | ISC |
Hitch (software) is an open-source TLS proxy and load balancer designed to terminate Transport Layer Security connections for high-performance web services. It was developed to work with HTTP servers and content delivery networks, enabling secure connections between clients and backend servers. Hitch is commonly used in conjunction with reverse proxies, web servers, caching platforms, and cloud platforms to offload cryptographic work and manage certificate lifecycles.
Overview
Hitch functions as a dedicated TLS terminator positioned in front of HTTP servers such as Nginx, Apache HTTP Server, Lighttpd, Caddy and platform components like Varnish and HAProxy. It interoperates with certificate authorities including Let's Encrypt and enterprise systems like Microsoft Certificate Services and HashiCorp Vault. Designed by engineers associated with Fastly and deployed in environments managed by operators from Amazon Web Services, Google Cloud Platform, Microsoft Azure, and operators of Cloudflare-scale networks, Hitch aims to reduce CPU overhead on origin servers while integrating with orchestration tools such as Kubernetes, Docker, and Ansible.
Features
Hitch implements features expected from termination proxies used in production: support for modern TLS versions standardized by IETF working groups, cipher configuration compatible with recommendations from OpenSSL and implementations like BoringSSL, and certificate handling patterns compatible with X.509 standards and OCSP stapling. It offers session resumption features tied to ticketing mechanisms described by RFC 5077 and RFC 8446 extensions, and supports negotiated extensions from TLS 1.3 and earlier versions specified by RFC 5246. Hitch integrates with logging ecosystems used by ELK Stack components such as Elasticsearch, Logstash, and Kibana, and supports metrics compatible with collectors like Prometheus and Graphite.
Architecture
Hitch is implemented in the C language and built against OpenSSL APIs. Its architecture positions it as a proxy between clients and backend services such as Node.js, Ruby on Rails, Django, nginx unit, and application frameworks like Spring Framework and ASP.NET Core. The design separates TLS termination from application logic and complements edge caches such as Fastly CDN and Akamai Technologies distributions. Hitch’s event-driven model draws on patterns present in libevent and libuv ecosystems, and it interacts with system facilities like systemd socket activation and Linux kernel interfaces including epoll and sendfile.
Deployment and Configuration
Hitch is typically deployed on Unix-like hosts, virtual machines on Amazon EC2, Google Compute Engine, or Microsoft Azure Virtual Machines, and as sidecar containers in Kubernetes pods managed via controllers like Helm charts and operators such as Cert-Manager. Configuration files integrate with secrets management systems such as HashiCorp Vault, AWS Secrets Manager, and Azure Key Vault. Administrators automate certificate provisioning workflows involving ACME protocols with clients like Certbot and integration tools from Let's Encrypt partners. Operational tooling often pairs Hitch with infrastructure as code frameworks like Terraform, Pulumi, and SaltStack.
Performance and Scalability
Hitch targets high-throughput, low-latency termination for environments serving traffic volumes similar to those handled by Fastly, Cloudflare, and hyperscale content platforms operated by Netflix and YouTube. Its performance profile leverages optimized cryptographic implementations from OpenSSL and CPU features such as AES-NI and AVX extensions found in Intel and AMD processors. Hitch is often benchmarked with tools like wrk, ApacheBench, and JMeter and measured via observability stacks like Grafana dashboards fed by Prometheus exporters. Operational scaling strategies use layer designs with Anycast routing, software load balancers like HAProxy and Traefik, and hardware accelerators including FPGAs and TLS terminators.
Security and Use Cases
Hitch provides TLS termination and cryptographic policy management to support compliance regimes referenced by organizations such as PCI DSS, HIPAA-covered entities, and agencies following NIST guidelines. Use cases include edge termination for CDNs used by WordPress hosting providers, API gateways serving OAuth 2.0 and OpenID Connect flows, and microservice mesh patterns where it complements service meshes like Istio and Linkerd. Security operations teams integrate Hitch with incident response processes used by teams following playbooks from MITRE ATT&CK frameworks and utilize scanning tools from Qualys, Nessus, and OpenVAS.
History and Development
Hitch originated in efforts by engineers at Fastly to separate TLS termination from backend processing and to provide a lightweight, permissively licensed alternative to monolithic servers. Development progressed alongside major TLS milestones ratified by IETF and implementations from projects such as OpenSSL and BoringSSL. Contributors and maintainers have included engineers with backgrounds at Fastly, Mozilla, and other internet infrastructure organizations. The project has been packaged for distributions like Debian, Ubuntu, CentOS, and FreeBSD, and integrated into cloud-native workflows championed by communities around CNCF projects and open-source ecosystems led by organizations such as the Linux Foundation.