Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Heyo I'm back!

I was going through the Ory Keto reference config and I came across the `serve.opl`  block.

I'm not entirely sure what the `serve.opl.write_listen_file`  is supposed to do. I suspect that this might have something to do with the `/opl/syntax/check` HTTP endpoint, but the description of that endpoint is pretty vague.

Very quickly can someone give me a quick rundown of what this config option is and what it does please :3?

hmmm seems like it might be a new feature? looking back at the config I setup previously, none of the serve endpoints have this write_listen_file, but now they all do...

I'm guessing the `write_listen_file` just creates a file containing a port number that was free, and thus this feature is only used when the `port` setting is set to `0`.

yeah, looks like it's new. Keto `v0.12.0` doesn't know what it is, but it works with `v0.14.0` . Looking at the `/tmp`  directory it saves the following string:
`127.0.0.1:33523` . Guess my suspicions were correct. Sorry for the bother!