Missing "Accept" Request Header in generated files based on OAS 3.0

[guillaumeserale]

When Refitter generates Refit interfaces from a OAS 3.0 spec file, it doesn't add the "Accept" header , which necesssary for ASP.NET Core's ProblemDetails Middleware to function properly.

According to OAS 3.0 specification, The content property in responses contains the MIME type expected in the response.

I'm suggesting to add an optional parameter addAcceptHeaders to add the accept header.
Examples

• without addAcceptHeaders:

        /// Multiple status values can be provided with comma separated strings
        /// </summary>
        [Get("/pet/findByStatus")]
        Task<ICollection<Pet>> FindPetsByStatus([Query(CollectionFormat.Multi)] IEnumerable<Anonymous> status);

• with addAcceptHeaders:

        /// Multiple status values can be provided with comma separated strings
        /// </summary>
        [Headers("Accept: application/json")]
        [Get("/pet/findByStatus")]
        Task<ICollection<Pet>> FindPetsByStatus([Query(CollectionFormat.Multi)] IEnumerable<Anonymous> status);```

[christianhelle]

@guillaumeserale thanks for reporting this

[christianhelle]

@all-contributors please add @guillaumeserale for bug

[allcontributors]

@christianhelle

I've put up a pull request to add @guillaumeserale! 🎉

[christianhelle]

Implemented in #108