FastAPI POST重定向GET传参报错及传参可行性咨询

我搞不懂怎么在FastAPI的重定向响应里传递额外数据，查了几个相关回答也没理清问题。

前端代码（HTML文件中的脚本） #

function cmb_pos() {
        var data = {
            'dep_id': dep_id, 'div_id': div_id,
        }
        fetch('/job-history/add-new/intermediate/{{persona_id}}', {
            method: 'POST',
            headers: {
                'Accept': 'application/json',
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(data)
        })
            .then(response => response.json())
            .then(response => console.log(JSON.stringify(response)))
    };

第一个端点（接收POST请求、执行操作并重定向的函数） #

from starlette.datastructures import URL

@router.post(path="/add-new/intermediate/{persona_id}",
    response_class=responses.RedirectResponse,
)
async def my_test(request: Request, item: Item, persona_id: int, service: Related):
    staff_schedule = await service.get_item_by_where(....)
    context_ext = {}
    context_ext["request"] = request
    context_ext["staff_schedule"] = staff_schedule
    context_ext["flag"] = True

    redirect_url = URL(request.url_for("create_job_history_init", persona_id=persona_id))
                  .include_query_params(context_ext=context_ext)
    return responses.RedirectResponse(
        url=redirect_url,
        status_code=status.HTTP_303_SEE_OTHER,
    )

第二个端点（重定向目标函数） #

@router.get(path="/persona_id={persona_id}/add-new",
    response_class=responses.HTMLResponse,
)
async def create_job_history_init(request: Request, persona_id: int,
    schedule_service: CommonsDep, context_ext: Optional[dict] = None,
):
    context = {}
    schedule = await schedule_service.get_all_item()
    related = ......
    context = schedule | related
    context["request"] = request
    context["persona_id"] = persona_id
    context["context_ext"] = context_ext

    return backend.webapps.templates.TemplateResponse(
        name="job_history/create_job_history.html",
        context=context,
    )

遇到的错误 #

File "/Users/pas/------/backend/webapps/job_history.py", line 276, in my_test
).include_query_params(context_ext=context_ext)

File "/Users/pas/-------/.my_pers/lib/python3.11/site-packages/starlette/datastructures.py", line 143, in include_query_params
params = MultiDict(parse_qsl(self.query, keep_blank_values=True))

File "/Users/pas/---------/.my_pers/lib/python3.11/site-packages/starlette/datastructures.py", line 83, in query
return self.components.query

File "/Users/pas/---------/.my_pers/lib/python3.11/site-packages/starlette/datastructures.py", line 66, in components
self._components = urlsplit(self._url)

TypeError: unhashable type: 'URL'

请问我哪里操作有误？是否可以通过重定向传递额外数据？非常感谢！

更新 #

看到一个解决方案，但使用时出现如下错误：

return tuple(x.decode(encoding, errors) if x else '' for x in args)

AttributeError: 'URL' object has no attribute 'decode'

对应的代码行是：
parsed = list(urllib.parse.urlparse(redirect_url))

我自己找到的可行解决方案是修改为：
parsed = list(urllib.parse.urlparse(redirect_url._url))
添加._url后成功完成了解析。

内容的提问来源于stack exchange，提问作者Speedy Gonzales