wwwhisper is a low latency HTTP reverse proxy, which allows you to easily add verified email based authentication and authorization to Heroku-hosted web applications.
The wwwhisper reverse proxy is language, framework and application independent, it can forward requests and add authorization to any HTTP server or web app.
The proxy is developed with low-latency as the primary concern. Auth decisions must be made before each request is passed to the app, so any latency introduced by the auth layer increased the total processing time of each HTTP request. For this reason, the wwwhisper proxy heavily caches auth data, and most incoming requests are authorized fully locally without contacting the wwwhisper backend. The cache has mechanisms for quickly detecting and evicting stalled data.
To enable wwwhisper for your Heroku-hosted web application, follow the Heroku Dev Center instructions.
A user who visits a wwwhisper-protected site is presented with a login prompt:
The Request a login link button sends a link with an email
verification token to the provided email address.
After the link is clicked, wwwhisper verifies whether the user is authorized to access the URL. If this is the case, the user is taken to the site.
By default, wwwhisper inserts a small overlay in the lower-right
corner of each protected HTML document. The overlay displays the
current user's email a Sign out button:
Finally, the admin application allows to easily grant or revoke access:
Note: on Heroku you don't need to compile and run wwwhisper directly, just follow the Heroku Dev Center instructions to add a buildpack to your app.
If you subscribe to the wwwhisper add-on, you can run the wwwhisper proxy locally or in front of any HTTP service, even outside of Heroku. To do it, compile wwwhisper:
make
Obtain the WWWHISPER_URL variable from Heroku and make it available to wwwhisper:
export WWWHISPER_URL=`heroku config:get WWWHISPER_URL`
Run wwwhisper:
./wwwhisper -listen 8080 -proxyto 8000
The code in this repository is packaged and made available as a Heroku Buildpack for the Heroku Common Runtime and Cedar Private Spaces, and as a Cloud Native Buildpack for the Heroku Fir Private Spaces.
wwwhisper authorization was originally provided as Ruby Rack middleware and Node.js Connect middleware. These middlewares are still supported and can be used for Ruby and Node apps if you prefer middleware based, same process integration, rather than running a separate proxy process in front of the app.
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wwwhisper was launched in 2012 as a non-commercial open source project for authenticating/authorizing requests to web apps.
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The development of the project was motivated by the introduction of Mozilla Persona a decentralized authentication system that wwwhisper used.
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At that time, wwwhisper was available as a Django-based backend with which nginx communicated using auth-request module.
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In those pre-Docker era, running and configuring a third-party backend like wwwhisper was cumbersome. wwwhisper tried to simplify things as much as possible with installation scripts, but that did not help with the adoption. People liked the project idea, but not many actually used wwwhisper.
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In 2013, a commercial wwwhisper Heroku add-on was launched. The managed backend provided by the add-on solved the problem of installation complexity, and the add-on has seen much better adoption than the free, open-source wwwhisper.
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The integration with the add-on was provided as Ruby Rack middleware, thus the add-on was available for Ruby apps only.
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In 2014, a Node.js Connect middleware was created and the wwwhisper add-on became available for Node apps.
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In 2016, Mozilla shut down the Persona project. To continue operations, the wwwhisper add-on switched to email-based login tokens. The open source version of wwwhisper was never extended to support the tokens, no one complained and further development of open source wwwhisper backend was halted.
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In 2023, an nginx based wwwhisper Heroku buildpack was launched which used the nginx auth-request module. As a generic HTTP reverse proxy it allowed to use wwwhisper add-on with any language and framework, not just Ruby and Node.
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In 2025, the wwwhisper Heroku buildpack was switched from using nginx to a custom Go-based proxy (this repository). This change enabled authentication data caching, which is crucial for efficiently running wwwhisper-protected apps at any location in the world, not just near to the wwwhisper managed backends (EU and US).