The HTTP URI must use a : character followed by the custom verb (:archive in the above example), and the verb in the URI must match the verb in the name of the RPC.
However, there's an exception in the Stateless methods section:
The URI should place both the verb and noun after the : separator (avoid a "faux collection key" in the URI in this case, as there is no collection). For example, :translateText is preferable to text:translate.
This exception, allowing verb and noun, is easy to miss. It would be helpful to update the general guidance with a phrase like "... except for stateless methods as defined in this AIP."
General guidance in AIP-136 states that:
However, there's an exception in the Stateless methods section:
This exception, allowing verb and noun, is easy to miss. It would be helpful to update the general guidance with a phrase like "... except for stateless methods as defined in this AIP."