### Description I created an MCP Server via OpenAPI Spec definition, and have explicitly added the extra-header configuration to forward request headers. However the Authorization header still fails to be transparently passed to the target backend service. The current running version is v1.91.0. I noticed this related issue was patched and fixed starting from version v1.84, but the header passthrough feature still does not work on my environment. ### Steps to Reproduce 1. Generate MCP Server using OpenAPI Spec ，Add extra-header config to enable header forwarding jsonfile: ```json { "openapi": "3.0.1", "info": { "title": "report", "description": "", "version": "1.0.0" }, "tags": [ { "name": "收缴报表-现金流" } ], "paths": { "/collection/cashFlow/summary/listByPage": { "post": { "summary": "收缴报表-现金流-汇总表-分页查询", "deprecated": false, "description": "", "operationId": "summaryListByPageUsingPOST", "tags": [ "收缴报表-现金流" ], "parameters": [ { "name": "Authorization", "in": "header", "description": "Authorization", "required": fal…