Struct McpHttpHandler 

pub struct McpHttpHandler {}

Implementations

impl McpHttpHandler

pub fn create_request( method: Method, uri: Uri, headers: HeaderMap, body: Option<&str>, ) -> Request<&str>

Creates a new HTTP request with the given method, URI, headers, and optional body.

Arguments

• method - The HTTP method to use (e.g., GET, POST).
• uri - The target URI for the request.
• headers - A map of optional header keys and their corresponding values.
• body - An optional string slice representing the request body.

Returns

An http::Request<&str> initialized with the specified method, URI, headers, and body. If the body is None, an empty string is used as the default.

impl McpHttpHandler

pub async fn handle_sse_connection( state: Arc<McpAppState>, sse_message_endpoint: Option<&str>, ) -> TransportServerResult<Response<BoxBody<Bytes, TransportServerError>>>

Handles an MCP connection using the SSE (Server-Sent Events) transport.

This function serves as the entry point for initializing and managing a client connection over SSE when the sse feature is enabled.

Arguments

• state - Shared application state required to manage the MCP session.
• sse_message_endpoint - Optional message endpoint to override the default SSE route (default: /messages ).

Features

This function is only available when the sse feature is enabled.

pub async fn handle_sse_message( request: Request<&str>, state: Arc<McpAppState>, ) -> TransportServerResult<Response<BoxBody<Bytes, TransportServerError>>>

Handles incoming MCP messages from the client after an SSE connection is established.

This function processes a message sent by the client as part of an active SSE session. It:

• Extracts the sessionId from the request query parameters.
• Locates the corresponding session’s transmit channel.
• Forwards the incoming message payload to the MCP transport stream for consumption.

Arguments

• request - The HTTP request containing the message body and query parameters (including sessionId).
• state - Shared application state, including access to the session store.

Returns

• TransportServerResult<http::Response<GenericBody>>:
  • Returns a 202 Accepted HTTP response if the message is successfully forwarded.
  • Returns an error if the session ID is missing, invalid, or if any I/O issues occur while processing the message.

Errors

• SessionIdMissing: if the sessionId query parameter is not present.
• SessionIdInvalid: if the session ID does not map to a valid session in the session store.
• StreamIoError: if an error occurs while writing to the stream.
• HttpError: if constructing the HTTP response fails.

pub async fn handle_streamable_http( request: Request<&str>, state: Arc<McpAppState>, ) -> TransportServerResult<Response<BoxBody<Bytes, TransportServerError>>>

Handles incoming MCP messages over the StreamableHTTP transport.

It supports GET, POST, and DELETE methods for handling streaming operations, and performs optional DNS rebinding protection if it is configured.

Arguments

• request - The HTTP request from the client, including method, headers, and optional body.
• state - Shared application state, including configuration and session management.

Behavior

• If DNS rebinding protection is enabled via the app state, the function checks the request headers. If dns protection fails, a 403 Forbidden response is returned.
• Dispatches the request to method-specific handlers based on the HTTP method:
  • GET → handle_http_get
  • POST → handle_http_post
  • DELETE → handle_http_delete
• Returns 405 Method Not Allowed for unsupported methods.

Returns

• A TransportServerResult wrapping an HTTP response indicating success or failure of the operation.