[Typescript][Angular] Status Code 204: Accept-Content Header

Description

Wrong Accept-Content Header for empty response types

Swagger-codegen version

3.0.14

Swagger declaration file content or url

delete:
      operationId: deletePartnerByID
      tags:
        -Partner
      summary: Deletes a communication partner
      parameters:
        - name: deletePartnerByID
          in: path
          description: ID of partner to delete
          required: true
          schema:
            type: integer
            format: int64
      responses:
        204:
          description: OK
        400:
          description: Invalid ID supplied
          content:
            application/json: {}
        404:
          description: Communication partner not found
          content:
            application/json: {}

Command line used for generation

not needed

Steps to reproduce

Follow the Guideline How to make OpenAPI 3.0 to send an empty Accept-Content Header
https://swagger.io/docs/specification/describing-responses/
(In Our Case for HTTP Status code 204)
Test the generated code.
Watch Request Headers
See Accept-Content Header "application/json"

Related issues/PRs

Suggest a fix/enhancement

Fix this code in modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache

 var contentType = this.jsonPreferredMime(contentTypes);
    if (contentType) {
      if(contentType != 'multipart/form-data') {
        request.type(contentType);
      }
    } else if (!request.header['Content-Type']) {
      request.type('application/json');
    }

Start in modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache and inspect how contentTypes are handled for the 204 response in the provided OpenAPI declaration. Generate the TypeScript/Angular client and observe the request headers. Done means the empty 204 response no longer produces an application/json Accept-Content header.