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mod_http_oauth2: Advertise the currently supported id_token signing algorithm This field is REQUIRED. The algorithm RS256 MUST be included, but isn't because we don't implement it, as that would require implementing a pile of additional cryptography and JWT stuff. Instead the id_token is signed using the client secret, which allows verification by the client, since it's a shared secret per OpenID Connect Core 1.0 § 10.1 under Symmetric Signatures. OpenID Connect Discovery 1.0 has a lot of REQUIRED and MUST clauses that are not supported here, but that's okay because this is served from the RFC 8414 OAuth 2.0 Authorization Server Metadata .well-known endpoint!

---
summary: HTTP Authentication using custom JSON protocol
...

Introduction
============

To authenticate users, this module does a `POST` request to a configured
URL with a JSON payload. It is not async so requests block the server
until answered.

Configuration
=============

``` lua
VirtualHost "example.com"
authentication = "custom_http"
auth_custom_http = {
  post_url = "http://api.example.com/auth";
}
```

Protocol
========

The JSON payload consists of an object with `username` and `password`
members:

    {"username":"john","password":"secr1t"}

The module expects the response body to be exactly `true` if the
username and password are correct.