How to customize sseEndpoint in HttpClientSseClientTransport?

[StrongManLi]

I'm trying to customize the sseEndpoint in HttpClientSseClientTransport to avoid the default /sse suffix, but I'm facing challenges. Here's my current configuration and issue:

Configuration

mcp:
  client:
    sse:
      connections:
        server1:
          url: https://xx.cn/sse/ff

Issue
The framework automatically appends /sse to the configured URL, resulting in a request to https://xx.cn/sse/ff/sse, which is incorrect.

The HttpClientSseClientTransport constructor uses a default sseEndpoint value (/sse):

HttpClientSseClientTransport(HttpClient httpClient, HttpRequest.Builder requestBuilder, String baseUri,
                             String sseEndpoint, ObjectMapper objectMapper) {
    // ...
    this.sseEndpoint = sseEndpoint;
}

Request
Is there a way to override the sseEndpoint without modifying the source code?