application/problem+json

[Marjoh2]

Hello all. Firstly my apologies if I am asking a common question. I am new to typespec and have searched the documentation, and this discussion without success.

I am looking for a way of setting the Content-Type in the openapi file to application/problem+json. I have tried

setting the header in the model like so.
model ErrorResponse {
@Header contentType: "application/problem+json";
}

with a decorator like so
@ContentType("application/problem+json")
model ErrorResponse {
// ...fields...
}

setting the body (which feels wrong) like so
model ErrorResponse {
@Body({ contentType: "application/problem+json" })
}

And nothing seems to work for me. The openapi output file remains unchanged.

I would welcome any suggestions. Thanks.

[timotheeguerin]

The first thing you tried should work

import "@typespec/http";

using Http;

@error
model ErrorResponse {
  @header contentType: "application/problem+json";
  data: unknown;
}

model Result {
  data: string;
}

op getStuff(): Result | ErrorResponse;

https://typespec.io/playground/?e=%40typespec%2Fopenapi3&c=aW1wb3J0ICJAdHlwZXNwZWMvaHR0cCI7Cgp1c2luZyBIdHRwOwoKQGVycm9yCm1vZGVsIEXEDFJlc3BvbnNlIHsKICBAaGVhZGVyIGNvbnRlbnRUeXBlOiAiYXBwbGljYXRpb24vcHJvYmxlbStqc29uIjsKICBkYXRhOiB1bmtub3duOwp9CsddUmVzdWx0xVbGI3N0cmluZ8Uib3AgZ2V0U3R1ZmYoKTrIK3zuAJE7Cg%3D%3D&options=%7B%7D&vs=%7B%7D

[Marjoh2]

@timotheeguerin thanks for your reply. I seen now how it should work. My file is still not working, but at least you have given me a target to shoot at. Many thanks.