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Return errors rather than panicking for callable APIs #809

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@smklein smklein commented Mar 24, 2022

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Thanks for doing this! I was actually going to do this as well so that automated tests (e.g., for authn) could try calling all endpoints without crashing Nexus.

@@ -219,6 +225,11 @@ impl From<Error> for HttpError {
String::from("Forbidden"),
),

Error::NotImplemented => HttpError::for_status(
Some(String::from("Not Implemented")),
http::StatusCode::NOT_IMPLEMENTED,
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I only wonder whether this is ever what we would want to return to clients, or if we'd want this to be a 500?

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I don't have a strong opinion - if you want me to fold it into 500, that's an easy change to make - but if this isn't the right use-case for 501, what is?

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It may well be! I didn't know it existed. The only reason I ask is that it feels like TMI: if a customer sees it it's like we're telling them "not only is there a problem on our side here, but it's that we didn't notice we forgot to implement this". Doesn't really matter.

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Actually, reading https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/501 a little closer:

If the server does recognize the method, but intentionally does not support it, the appropriate response is 405 Method Not Allowed.

I'll send back 405 instead.

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I get why that technically sounds right, but 405 seems much worse to me. If a customer sees this, it's because we literally forgot to implement it, right? This isn't a client error.

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Ack, switched to 500 then. I'm running out of error codes to try at this point 😁

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If this is intended to represent todo! externally, I think it should be a 501 because that "implies future availability". 405 is "not supported" and unlikely to change (aka this endpoint does not accept PATCH).

We should keep 500 for actual server errors.

@smklein smklein enabled auto-merge (squash) March 25, 2022 15:33
@smklein smklein disabled auto-merge March 25, 2022 15:37
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@smklein is this PR still valid?

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