An Ruby WebFinger client library.

Following the latest WebFinger spec discussed at IETF WebFinger WG. tools.ietf.org/html/draft-ietf-appsawg-webfinger

If you found something different from the latest spec, open an issue please.


Add this line to your application's Gemfile:

gem 'webfinger'

And then execute:

$ bundle

Or install it yourself as:

$ gem install webfinger



You can discover resource metadata.

WebFinger.discover! 'acct:[email protected]'
WebFinger.discover! 'connect-op.heroku.com'
WebFinger.discover! 'http://connect-op.heroku.com'

You can also specify link relations via “rel” option.

WebFinger.discover! 'acct:[email protected]', rel: 'http://openid.net/specs/connect/1.0/issuer'
WebFinger.discover! 'acct:[email protected]', rel: ['http://openid.net/specs/connect/1.0/issuer', 'vcard']


Caching is important in HTTP-based discovery.

If you set your own cache object to WebFinger.cache, this gem caches the discovery result until it expires. (the expiry is calculated based on the “expires” value in JRD response)

# Set Cache
WebFinger.cache = Rails.cache

WebFinger.discover! 'acct:[email protected]' # do HTTP request
WebFinger.discover! 'acct:[email protected]' # use cache, no HTTP request


Once you turn-on debugging, you can see all HTTP request/response in your log.

# Turn on debugging

# Set logger (OPTIONAL, ::Logger.new(STDOUT) is used as default)
WebFinger.logger = Rails.logger

You can also specify URL builder to force non-HTTPS access. (NOTE: allow non-HTTPS access only for debugging, not on your production.)

WebFinger.url_builder = URI::HTTP # default URI::HTTPS


  1. Fork it

  2. Create your feature branch (`git checkout -b my-new-feature`)

  3. Commit your changes (`git commit -am 'Add some feature'`)

  4. Push to the branch (`git push origin my-new-feature`)

  5. Create new Pull Request

Copyright © 2012 nov matake. See LICENSE for details.