because in the data returned by the backend, the outermost basic field key may be uppercase or lowercase, for example:

{
    "data":{
        "relaData":{
            "ahahah":"hahahah",
            "heihei":"heihei"
        }
    },
    "status":1,
    "message":""
}

sometimes it starts with an uppercase Key

{
    "Data":{
        "relaData":{
            "ahahah":"hahahah",
            "heihei":"heihei"
        }
    },
    "Status":1,
    "Message":""
}

data cannot be parsed when Retrofit uses GsonConverterFactory . What I want to do is to define a Converter to change the string in the request body to uppercase or lowercase before parsing it into an object after GsonConverterFactory . Then come to GSON parsing, how to do it?