Question: How to add accept or contentType header as method parameter in generated webclient method?

Hi

We have defined our OAS(openapi.yml) with one GET operation where response can different contents for status 200 like this:

    DummyResponse:
      description: Dummy response
      content:
        "application/json":
          schema:
            $ref: "#/components/schemas/DummyObject"
        "application/json;version=2":
          schema:
            $ref: "#/components/schemas/DummyObjectV2"
        "application/json;version=3":
          schema:
            $ref: "#/components/schemas/DummyObjectV3"

When springboot application starts and swagger page is opened we are able to choose concrete value from combobox like this:

Now we want to generate apiclient via openapi-generator-maven-plugin(4.3.1) with following config:

<interfaceOnly>false</interfaceOnly>
<useOptional>true</useOptional>
<skipDefaultInterface>true</skipDefaultInterface>
<dateLibrary>java8</dateLibrary>
<java8>true</java8>
<library>webclient</library>

with result that method will contains accept header as parameter:

Object getDummy(List accept) or Object getDummy(String accept)

Of course we can define accept header in yaml file and put it as parameter but then we have duplicated field in rendered swagger

components:
  parameters:
    Accept:
      name: accept
      in: header
      required: false
      schema:
        type: array
        items:
          type: string
        default: ["application/json"]

Can somebody help me how to call our generated method via webclient with full control which accept header to be passed?

thanks
brpalo

Start with the openapi-generator-maven-plugin configuration and the webclient library generation that produces the getDummy method. Trace how the OpenAPI response content types are represented in the generated method signature and compare them with the requested accept parameter. Done means documenting or implementing a supported way to pass the desired Accept header without duplicating it as an explicit OpenAPI header parameter.