OpenAPI 3 python-flask:如何在响应中使用多种内容类型

OpenAPI 3 python-flask: how to use multiple content types in response

在 OA3 文档中,它指出您可以有多种响应内容类型,如下所示:


paths:
  /users:
    get:
      summary: Get all users
      responses:
        '200':
          description: A list of users
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArrayOfUsers'
            application/xml:
              schema:
                $ref: '#/components/schemas/ArrayOfUsers'
            text/plain:
              schema:
                type: string

如何在生成的 python-flask 应用程序的控制器中指定 return 特定内容类型?

这是我试图实现的规范的响应部分:

      responses:
        "200":
          description: successful operation
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/CoordinateResponse"
            text/csv:
              schema:
                type: string

我的控制器中有一个名为 response_value 的字符串变量,其中包含 CSV 文件的内容。

我尝试了很多不同的东西,例如

return response_value, 200, {'Content-Type': 'text/csv; charset=utf-8'}

produces a response with Content-Type: application/json

from connexion.lifecycle import ConnexionResponse
return ConnexionResponse(body=response_value, status_code=200, content_type='text/csv')

produces no response

from flask import Response
return Response(response_value, mimetype='text/csv')

produces no response

from flask import make_response
output = make_response(response_value)
output.headers["Content-type"] = "text/csv"
return output

produces no response

如何让它响应 Content-Type: text/csv

终于让它像这样工作了:

            from io import BytesIO
            mem = BytesIO()
            mem.write(response_value.encode('utf-8'))
            mem.seek(0)

            from flask import send_file
            return send_file(
                mem,
                as_attachment=True,
                attachment_filename="somefile.csv",
                mimetype='text/csv'
            )

当我 post 一个 Whosebug 问题时,我偶然发现了答案。我的人生故事。