Conan

NORA acts as a caching proxy for ConanCenter (center2.conan.io). Recipe and package files are immutably cached (scoped to revision hashes); metadata uses TTL-based refresh. This is a proxy-only registry — uploading recipes is not supported.

Client Configuration

Add NORA as a Conan remote:

conan remote add nora http://nora.example.com:4000/conan

Then install packages as usual:

conan install . --remote=nora

Upstream Proxy

config.toml:

[conan]
enabled = true
proxy = "https://center2.conan.io"
proxy_timeout = 30
proxy_timeout_download = 120
metadata_ttl = 300  # seconds

Environment variables:

Variable	Description	Default
NORA_CONAN_ENABLED	Enable Conan proxy	false
NORA_CONAN_PROXY	Upstream Conan registry URL	https://center2.conan.io
NORA_CONAN_PROXY_AUTH	Upstream auth (user:pass)	—
NORA_CONAN_PROXY_TIMEOUT	Upstream timeout for metadata (seconds)	30
NORA_CONAN_PROXY_TIMEOUT_DOWNLOAD	Upstream timeout for binary downloads (seconds)	120
NORA_CONAN_METADATA_TTL	Metadata cache TTL in seconds	300

Features

Feature	Status	Notes
Ping (/v2/ping)	Full	Returns X-Conan-Server-Capabilities: revisions
Recipe search	Full	Proxied to upstream
Recipe latest revision	Full	TTL-cached
Recipe revision list	Full	TTL-cached
Recipe file list	Full	Immutable cache (revision-scoped)
Recipe file download	Full	Immutable cache
Package latest revision	Full	TTL-cached
Package revision list	Full	TTL-cached
Package file list	Full	Immutable cache (revision-scoped)
Package file download	Full	Immutable cache
Recipe/package upload	—	Proxy-only (read)
Authentication	—	Anonymous read only

Known Limitations

• Proxy-only: conan upload is not supported. NORA caches packages downloaded from the upstream registry.
• Only anonymous read access is supported.
• Disabled by default. Set NORA_CONAN_ENABLED=true to activate.