Enum ClientInitializeError 

#[non_exhaustive]
pub enum ClientInitializeError {
    ExpectedInitResponse(Option<ServerJsonRpcMessage>),
    ExpectedInitResult(Option<ServerResult>),
    ConflictInitResponseId(RequestId, RequestId),
    UncorrelatedErrorResponse {
        expected: RequestId,
        received: RequestId,
    },
    ConnectionClosed(String),
    TransportError {
        error: DynamicTransportError,
        context: Cow<'static, str>,
    },
    JsonRpcError(ErrorData),
    NoCompatibleProtocolVersion {
        client_supported: Vec<ProtocolVersion>,
        server_supported: Vec<ProtocolVersion>,
    },
    NoPreferredProtocolVersion,
    Cancelled,
    LegacyFallbackFailed {
        discover: Box<ClientInitializeError>,
        fallback: Box<ClientInitializeError>,
    },
}

Available on crate feature client and (crate features client or server) only.

It represents the error that may occur when serving the client.

if you want to handle the error, you can use serve_client_with_ct or serve_client with Result<RunningService<RoleClient, S>, ClientError>

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.

ExpectedInitResponse(Option<ServerJsonRpcMessage>)

ExpectedInitResult(Option<ServerResult>)

ConflictInitResponseId(RequestId, RequestId)

UncorrelatedErrorResponse

Fields

expected: RequestId

received: RequestId

ConnectionClosed(String)

TransportError

Fields

error: DynamicTransportError

context: Cow<'static, str>

JsonRpcError(ErrorData)

NoCompatibleProtocolVersion

Fields

client_supported: Vec<ProtocolVersion>

server_supported: Vec<ProtocolVersion>

NoPreferredProtocolVersion

Cancelled

LegacyFallbackFailed

Fields

discover: Box<ClientInitializeError>

fallback: Box<ClientInitializeError>

Implementations

impl ClientInitializeError

pub fn transport<T: Transport<RoleClient> + 'static>( error: T::Error, context: impl Into<Cow<'static, str>>, ) -> Self

pub fn auth_challenge(&self) -> Option<&str>

Available on crate feature transport-streamable-http-client only.

The WWW-Authenticate challenge from the 401/403 the transport hit during initialization, if that is why initialization failed.

This is the trigger of the reactive OAuth flow: feed the challenge to AuthorizationRequest::with_challenge to authorize, then reconnect.

pub fn is_authorization_required(&self) -> bool

Returns whether client initialization failed because authorization is required.

This covers both missing or expired local OAuth authorization and an HTTP authorization challenge from the MCP server.

Trait Implementations

impl Debug for ClientInitializeError

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

Formats the value using the given formatter.

impl Display for ClientInitializeError

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

Formats the value using the given formatter.

impl Error for ClientInitializeError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<ClientInitializeError> for RmcpError

fn from(source: ClientInitializeError) -> Self

Converts to this type from the input type.