SSE connection fails because many Remote MCP servers do not support HTTP GET

[sugimomoto]

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I attempted to connect to Postman's Remote MCP Server using MCP's SSE, but encountered an error. https://www.postman.com/postman/postman-public-workspace/collection/681dc649440b35935978b8b7

The server side error message is as follows:

HTTP Request: GET https://mcp.postman.com/mcp "HTTP/1.1 405 Method Not Allowed"

It appears that a GET request is being made during the initial connection setup, but many Remote MCP Servers, including Postman's, do not accept GET requests.

Would it be possible to change this to a POST request or add an option to configure the HTTP method?