Enum GrpcBareAddressScheme 

#[non_exhaustive]
pub enum GrpcBareAddressScheme {
    HttpsExceptLoopback,
    Https,
    Http,
}

How a gRPC interface address that carries no scheme is connected.

A2A’s AgentInterface.url for the gRPC binding is a gRPC target ("hostname:port", per the proto’s field comment since A2A cfc9d34), not a URL: gRPC names carry no scheme, and whether the channel is TLS is a property of the channel, not of the name. The official SDKs leave that choice to the caller (Python: a grpc_channel_factory; the A2A project’s own Rust SDK: plaintext unless a rustls config is supplied). This SDK makes the choice explicit and defaults to the safe one.

An address that already carries http:// or https:// is used as-is; this policy applies only to bare host[:port] addresses.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

HttpsExceptLoopback

TLS (https://) for every host except loopback (localhost, 127.0.0.0/8, ::1), which is plaintext. The default: the specification requires TLS in production (§13), and a loopback address is the one case where the peer is this machine — the same rule browsers apply when they treat localhost as a secure context.

Https

TLS for every bare address, loopback included.

Http

Plaintext for every bare address. For private networks that terminate TLS elsewhere (a service mesh sidecar, a Docker Compose network whose agents advertise agent:50051), and for nothing reachable from the public internet.

Trait Implementations

impl Clone for GrpcBareAddressScheme

fn clone(&self) -> GrpcBareAddressScheme

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for GrpcBareAddressScheme

impl Debug for GrpcBareAddressScheme

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for GrpcBareAddressScheme

fn default() -> GrpcBareAddressScheme

Returns the “default value” for a type.

impl Eq for GrpcBareAddressScheme

impl PartialEq for GrpcBareAddressScheme

fn eq(&self, other: &GrpcBareAddressScheme) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for GrpcBareAddressScheme