Struct UnsupportedProtocolVersionError 

pub struct UnsupportedProtocolVersionError {
    pub error: UnsupportedProtocolVersionErrorError,
    pub id: Option<RequestId>,
    /* private fields */
}

Latest MCP Protocol 2026_07_28 Returned when the request’s protocol version is unknown to the server or unsupported (e.g., a known experimental or draft version the server has chosen not to implement). For HTTP, the response status code MUST be 400 Bad Request.

JSON schema

{
 "description": "Returned when the request's protocol version is unknown to the server or\nunsupported (e.g., a known experimental or draft version the server has\nchosen not to implement). For HTTP, the response status code MUST be\n400 Bad Request.",
 "type": "object",
 "required": [
   "error",
   "jsonrpc"
 ],
 "properties": {
   "error": {
     "allOf": [
       {
         "$ref": "#/$defs/Error"
       },
       {
         "type": "object",
         "required": [
           "code",
           "data"
         ],
         "properties": {
           "code": {
             "type": "integer"
           },
           "data": {
             "type": "object",
             "required": [
               "requested",
               "supported"
             ],
             "properties": {
               "requested": {
                 "description": "The protocol version that was requested by the client.",
                 "type": "string"
               },
               "supported": {
                 "description": "Protocol versions the server supports. The client should choose a\nmutually supported version from this list and retry.",
                 "type": "array",
                 "items": {
                   "type": "string"
                 }
               }
             }
           }
         }
       }
     ]
   },
   "id": {
     "$ref": "#/$defs/RequestId"
   },
   "jsonrpc": {
     "type": "string",
     "const": "2.0"
   }
 }
}

Fields

error: UnsupportedProtocolVersionErrorError

id: Option<RequestId>

Implementations

impl UnsupportedProtocolVersionError

pub fn new( error: UnsupportedProtocolVersionErrorError, id: Option<RequestId>, ) -> Self

pub fn jsonrpc(&self) -> &String

Trait Implementations

impl Clone for UnsupportedProtocolVersionError

fn clone(&self) -> UnsupportedProtocolVersionError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UnsupportedProtocolVersionError

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for UnsupportedProtocolVersionError

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<UnsupportedProtocolVersionError> for RpcError

fn from(value: UnsupportedProtocolVersionError) -> Self

Converts to this type from the input type.

impl Serialize for UnsupportedProtocolVersionError

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.