HTTP ingress: optional query params don't work

[tomdaffurn]

Optional body parameters can be done with ftl.Option. I assume it can be done with query params too:

type GetRequest struct {
	UserID string             `json:"userId"`
	PostID string             `json:"postId"`
	Tag    ftl.Option[string] `json:"tag"`
}

// Example:       curl -i http://localhost:8891/http/users/123/posts?postId=456&tag=foo
//
//ftl:ingress http GET /http/users/{userId}/posts
func Get(ctx context.Context, req builtin.HttpRequest[GetRequest]) (builtin.HttpResponse[GetResponse, ErrorResponse], error) {
	if req.Body.UserID == "000" {
		return builtin.HttpResponse[GetResponse, ErrorResponse]{
			Error: ftl.Some(ErrorResponse{
				Error: "User not found",
			}),
		}, nil
	}
	tag := req.Body.Tag.Default("No value")
	return builtin.HttpResponse[GetResponse, ErrorResponse]{
		Headers: map[string][]string{"Get": {"Header from FTL"}},
		Body: ftl.Some(GetResponse{
			Message: fmt.Sprintf("Got userId %s, postId %s, tag %s", req.Body.UserID, req.Body.PostID, tag),
			Nested:  Nested{GoodStuff: "Nested Good Stuff"},
		}),
	}, nil
}

But it does't:

 % curl "http://localhost:8891/http/users/1/posts?postId=2&tag=foo" 
{"msg":"Got userId 1, postId 2, tag No value","nested":{"good_stuff":"Nested Good Stuff"}}%