Python中用request添加headers發送請求，headers中數據只能是str或bytes嗎，裏面還有字典dict格式怎麽辦？

header = {

"content-type": "application/json",

"a": json.dumps({"b": "b_value"}),

"some_param": json.dumps({"some_key_value": "some_string"})

}

也就是說用json.dumps把多余的嵌套變成字符串