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Automatic Certificates and HTTPS for everyone.
Lego
Let's Encrypt client and ACME library written in Go.
Features
- ACME v2 RFC 8555
- Support RFC 8737: TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
- Support RFC 8738: certificates for IP addresses
- Support RFC 9773: Renewal Information (ARI) Extension
- Support draft-aaron-acme-profiles-00: Profiles Extension
- Comes with about 150 DNS providers
- Register with CA
- Obtain certificates, both from scratch or with an existing CSR
- Renew certificates
- Revoke certificates
- Robust implementation of ACME challenges:
- HTTP (http-01)
- DNS (dns-01)
- TLS (tls-alpn-01)
- SAN certificate support
- CNAME support by default
- Custom challenge solvers
- Certificate bundling
- OCSP helper function
Installation
How to install.
Usage
Documentation
Documentation is hosted live at https://go-acme.github.io/lego/.
DNS providers
Detailed documentation is available here.
If your DNS provider is not supported, please open an issue.