Report OIDC errors to output

app/unit/OpenIDConnectUnit.js

@@ -58,6 +58,15 @@ class OpenIDConnectUnit extends Unit {
             ...configuration,
         })
 
+        const reportError = ({ headers: { authorization }, oidc: { body, client } }, err) => {
+            this.output.error('OpenIDConnect authorization error!')
+            this.output.error(err)
+        }
+
+        this.provider.on('grant.error', reportError)
+        this.provider.on('introspection.error', reportError)
+        this.provider.on('revocation.error', reportError)
+
         if ( configuration.proxy ) this.provider.proxy = true
         app.express.use('/oidc', this.wrap(this.provider.callback))
     }