Swagger-ui: Simple string response rendered as "no content" with response code 0.

[alphaleonis]

swagger-ui version 2.2.8

When an API returns a single string as a response it is shown as no content with response code 0 in Swagger-UI. (However, if the string consists only of digits, it seems to display the correct response and response code.

Swagger.json:

{
  "swagger": "2.0",
  "info": {
    "title": "TestAPI",
    "version": "1.0"
  },
  "host": "localhost:5000",
  "basePath": "",
  "schemes": [
    "http"
  ],
  "consumes": [
    "application/json"
  ],
  "produces": [
    "application/json"
  ],
  "paths": {
    "/api/test/string": {
      "get": {
        "tags": [
          "TestAPI"
        ],
        "operationId": "TestAPI_GetString",
        "parameters": [],
        "responses": {
          "200": {
            "description": "",
            "schema": {
              "type": "string"
            },
            "x-nullable": true
          }
        }
      }
    }
  },
  "definitions": {},
  "responses": {},
  "securityDefinitions": {}
}

Http response:

HTTP/1.1 200 OK
Date: Tue, 20 Dec 2016 09:30:59 GMT
Content-Type: application/json; charset=utf-8
Server: Kestrel
Content-Length: 5

Hello

Swagger UI Displays Response body as no content and Response Code as 0.

[fehguy]

If you're saying that your server produces json:

  "produces": [
    "application/json"
  ]

But you return non-json, you're going to get an error. Consider returning the type that the server claims to produce.