406: Not Acceptable: Client must accept both application/json and text/event-stream

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Posted on by GO-20061201-0

I have tried several variations in my OpenAPI 2.0 spec but can't seem to crack this one. Here's my latest attempt:

  "paths": {
    "/": {
      "post": {
        "tags": [
          "mcp-http-demoApi"
        ],
        "description": "Adds two numbers.",
        "operationId": "Add",
        "consumes": [
          "application/json"
        ],
        "produces": [
          "text/plain"
        ],
        "parameters": [
            {
                "in": "header",
                "name":"Accept",
                "required": true,
                "type": "string",
                "default": "application/json; text/event-stream"
            },
          {
            "in": "body",
            "name": "body",
            "required": true,
            "schema": {
              "type": "object"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "OK",
            "schema": {
              "type": "string"
            }
          }
        }
      }
    }
  },

In the swagger editor, this looks like:

curl -X 'POST' \
  'https://{my}.{api}.azurecontainerapps.io/mcp/' \
  -H 'accept: text/plain' \
  -H 'Accept: application/json; text/event-stream' \
  -H 'Content-Type: application/json' \
  -d '{
"a":5,"b":9
}'

but I still get the 406. I tried putting both MIME types in the "consumes". It ignores anything after the first item.

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GO-20061201-0 on at

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406: Not Acceptable: Client must accept both application/json and text/event-stream

The Accept header wants a comma between the mime types, not a semicolon.