Can Cursor connect to MCP server with self-signed certificate using streamable-http?

How To
1

I’m trying to connect to my MCP server using streamable-http transport with HTTPS.

Current setup in mcp.json:

    "streamable-https": {
      "url": "http://localhost:9000/mcp",
      "headers": {
        "PAT": "sequre_token"
      }
    },

The server uses a self-signed certificate for HTTPS. Is there any way to make Cursor trust this certificate? (Similar to curl’s -k option)

Thank you!

2

~Problem resolved.
Just disable HTTP2~
image

not works with others env…:downcast_face_with_sweat:

1 Like
3

Hi @_Lee_Seung_Hwan and welcome to Cursor Forum

You can mark your own answer as solution :slight_smile:

1 Like
4

Problem solved

The root cause of the issue was that I had generated an incorrect certificate file.
By setting the CN (Common Name) to exactly match the desired domain,
checking System Certificates and HTTP: Fetch Additional Support in the settings,
and registering the certificate in the keychain, the connection works properly.

5

it’s not perfect solution…
cursor only trust self-signed CA of localhost but remote server

6

add CA to SSL_CERT_DIR or SSL_CERT_FILE solve this issue but not perfect solution for security

7

additional solution : check http: Electron Fetch setting true
it doesn’t need to set any SSL_CERT_DIR or SSL_CERT_FILE