Undefined detail when endpoint that return a file throws a exception

[lucasmsoares96]

Description

The example provided below contains two endpoints:

@app.get(
    "/user/",
)
def read_user() -> UserPublic:
    """Get User."""
    raise HTTPException(
        status_code=404,
        detail="User not found.",#         <<<<<<<<
    )


@app.get(
    "/evidence/",
    response_class=FileResponse,
    responses={
        200: {"content": {"application/zip": {}}},
    },
)
def read_evidence() -> FileResponse:
    """Get Complaint Evidences."""
    raise HTTPException(
        status_code=404,
        detail="Evidence not found.",#         <<<<<<<<
    )

When testing these endpoints using the curl command, everything works fine:

curl -X 'GET' \
  'http://127.0.0.1:8000/user/' \
  -H 'accept: application/json'
{"detail":"User not found."}#         <<<<<<<<

curl -X 'GET' \
  'http://127.0.0.1:8000/evidence/' \
  -H 'accept: application/zip'
{"detail":"Evidence not found."}#         <<<<<<<<

However, when accessing the endpoints using the client generated by OpenAPI-TS, the readUserUserGet function works as expected, but the function readEvidenceEvidenceGet fails to retrieve the detail field in detail="Evidence not found.":

readUserUserGet

try {
	await DefaultService.readUserUserGet({
		throwOnError: true,
	});
} catch (e) {
	if (e instanceof AxiosError && e.response?.data?.detail) {
		console.log(e.response?.data?.detail);//         <<<<<<<<
	} else {
		console.log("detail user undefined");
	}
}

Output:

User not found.

readEvidenceEvidenceGet

try {
	await DefaultService.readEvidenceEvidenceGet({
		throwOnError: true,
	});
} catch (e) {
	if (e instanceof AxiosError && e.response?.data?.detail) {
		console.log(e.response?.data?.detail);
	} else {
		console.log("detail evidence undefined");//         <<<<<<<<
	}
}

Output:

detail evidence undefined

Reproducible example or configuration

https://gitlab.com/lucasmsoares96/DetailBug

OpenAPI specification (optional)

{
"openapi": "3.1.0",
"info": {
"title": "FastAPI",
"version": "0.1.0"
},
"paths": {
"/evidence/": {
"get": {
"summary": "Read Evidence",
"description": "Get Complaint Evidences.",
"operationId": "read_evidence_evidence__get",
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/zip": {}
}
}
}
}
},
"/user/": {
"get": {
"summary": "Read User",
"description": "Get User.",
"operationId": "read_user_user__get",
"responses": {
"200": {
"description": "Successful Response",
"content": {
"application/json": {
"schema": {
"$ref": "#/components/schemas/UserPublic"
}
}
}
}
}
}
}
},
"components": {
"schemas": {
"UserPublic": {
"properties": {
"name": {
"type": "string",
"title": "Name"
},
"age": {
"type": "integer",
"title": "Age"
}
},
"type": "object",
"required": [
"name",
"age"
],
"title": "UserPublic"
}
}
}
}

System information (optional)

OS: macOS 15.2 24C101 x86_64
Host: MacBookPro11,5
Kernel: 24.2.0
Uptime: 2 days, 2 hours, 20 mins
Packages: 127 (brew)
Shell: zsh 5.9
Resolution: 1440x900@2x
DE: Aqua
WM: Quartz Compositor
WM Theme: Blue (Light)
Terminal: vscode
CPU: Intel i7-4870HQ (8) @ 2.50GHz
GPU: Intel Iris Pro, AMD Radeon R9 M370X
Memory: 10755MiB / 16384MiB