typeUrl property
A URL/resource name that uniquely identifies the type of the serialized protocol buffer message.
This string must contain at least one "/" character. The last segment of
the URL's path must represent the fully qualified name of the type (as in
path/google.protobuf.Duration). The name should be in a canonical form
(e.g., leading "." is not accepted). In practice, teams usually precompile
into the binary all types that they expect it to use in the context of
Any. However, for URLs which use the scheme http, https, or no scheme,
one can optionally set up a type server that maps type URLs to message
definitions as follows: * If no scheme is provided, https is assumed. *
An HTTP GET on the URL must yield a google.protobuf.Type value in binary
format, or produce an error. * Applications are allowed to cache lookup
results based on the URL, or have them precompiled into a binary to avoid
any lookup. Therefore, binary compatibility needs to be preserved on
changes to types. (Use versioned type names to manage breaking changes.)
Note: this functionality is not currently available in the official
protobuf release, and it is not used for type URLs beginning with
type.googleapis.com. Schemes other than http, https (or the empty
scheme) might be used with implementation specific semantics.
Implementation
core.String? typeUrl;