[I] bug: route mcp server sse is not work [apisix]

[via GitHub]

kenneth-bro opened a new issue, #12138:
URL: https://github.com/apache/apisix/issues/12138

   ### Current Behavior
   
   I have an MCP server that works fine when configured within the intranet 
environment. However, when I configure it for external access via APISIX, it 
reports an error. Our current forwarding flow is:
   
   Cloud Load Balancer (with HTTPS certificate) → APISIX (HTTP, internal 
network) → MCP Server (HTTP, internal network)
   
   The access example is: https://std.test.mcp.net/mcp/common/sse, but an error 
occurs:
   It seems the protocol is automatically downgraded to HTTP. How should I 
handle this issue?
   
   
![Image](https://github.com/user-attachments/assets/9b4c0cb3-07a7-4db9-8eee-e29ca28cc2c4)
   
   
![Image](https://github.com/user-attachments/assets/a94ead21-19a5-4a82-9498-177bfc5b514e)
   
   ### Expected Behavior
   
   connect mcp server is right
   
   ### Error Logs
   
   SSE transport: url=https://std.test.mcp.net/mcp/common/sse, headers=Accept
   Error in /sse route: Error: Endpoint origin does not match connection 
origin: http://std.test.mcp.net/mcp/common/sse
       at EventSource.<anonymous> 
(file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/@modelcontextprotocol/sdk/dist/esm/client/sse.js:82:31)
       at [nodejs.internal.kHybridDispatch] (node:internal/event_target:786:20)
       at EventSource.dispatchEvent (node:internal/event_target:721:26)
       at 
file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/eventsource/dist/index.js:106:150
       at dispatchEvent 
(file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/eventsource-parser/dist/index.js:70:24)
       at parseLine 
(file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/eventsource-parser/dist/index.js:23:7)
       at Object.feed 
(file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/eventsource-parser/dist/index.js:18:7)
       at 
file:///Users/kenneth/.npm/_npx/5a9d879542beca3a/node_modules/eventsource/dist/index.js:95:46
       at process.processTicksAndRejections 
(node:internal/process/task_queues:95:5)
   
   ### Steps to Reproduce
   
   1、build a mcp server
   2、apisix config route
   
   ### Environment
   
   - APISIX version (run `apisix version`): 3.9.1
   - Operating system (run `uname -a`):
   - OpenResty / Nginx version (run `openresty -V` or `nginx -V`): nginx
   - etcd version, if relevant (run `curl 
http://127.0.0.1:9090/v1/server_info`): 3.5.0
   - APISIX Dashboard version, if relevant: 3.0.1
   - Plugin runner version, for issues related to plugin runners:
   - LuaRocks version, for installation issues (run `luarocks --version`):
   


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