Response body with ISO-8859-1 chars are not display correct

Q&A (please complete the following information)

• OS: macOS | Windows 10
• Browser: chrome, firefox etc.
• Version: all
• Method of installation: npm, or dist assets
• Swagger-UI version: 3.23.4
• Swagger/OpenAPI version: OpenAPI 3.0

Content & configuration

Example Swagger/OpenAPI definition:

paths:
  /search.query:
    get:
      operationId: query
      summary: Search API
      description: ...
      parameters:
        - in: query
          description: Search query
          name: search
          schema:
            type: string
      responses:
        "200":
          description: No response was specified

Swagger-UI configuration options:

      const ui = SwaggerUIBundle({
        urls: [{
          url: "api-docs/search.yaml",
          name:"search"
        }],
        dom_id: '#swagger-ui',
        deepLinking: true,
        validatorUrl: null,
        presets: [
          SwaggerUIBundle.presets.apis,
          SwaggerUIStandalonePreset
        ],
        plugins: [
          SwaggerUIBundle.plugins.DownloadUrl
        ],
        layout: "StandaloneLayout"
      })

Describe the bug you're encountering

If the API returns contet that isn't encoded with UTF-8 the display of the response body is not correct (see screenshot). The server returns a ISO-8859-1 encoded string and the german special chars (äüöß) are not displayed correct.

Expected behavior

The response body should be encoded with ISO-8859-1.

Screenshots

Should be "Tübinger Str. 1"

No source file or test is named in the issue. Start by reproducing the response-rendering problem with the supplied OpenAPI definition and Swagger UI configuration, using an ISO-8859-1 response containing “Tübinger Str. 1”; done means the German characters display correctly rather than as corrupted text.