我想我找到了如何重新生成OpenAPI模式的解决方案。
1.删除缓存app.openapi_schema = None
1.重新生成架构app.setup()

from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse
from pydantic import BaseModel

app = FastAPI()

class NewEndpointResponse(BaseModel):
    status: str
    method: str
    url_path: str

async def catch_all(request: Request) -> JSONResponse:
    """
    Your new endpoint handler
    """
    # some logic to interact with Auth-service
    # like: requests.get("http://Auth/...")
    res = NewEndpointResponse(status="OK", method=request.method, url_path=request.url.path)
    return JSONResponse(res.dict(), status_code=200)

class EndpointRegisterDTO(BaseModel):
    endpoint: str = "/new_endpoint"
    method: str = "GET"
    name: str = "Extra Functionality"

@app.post("/register/endpoint")
async def add_endpoint(request: EndpointRegisterDTO):
    """
    Adds new endpoint at runtime
    """
    app.add_api_route(
        request.endpoint,
        catch_all,
        methods=[request.method],
        name=request.name,
        response_model=NewEndpointResponse)
    app.openapi_schema = None
    app.setup()
    return {"status": "OK"}

1.打开http://AG/docs。只有一个端点可用。
1.按下“Try it out”（试用）并使用建议的参数执行POST /register/endpoint。
1.刷新http://AG/docs-现在您可以看到/new_endpoint。
1.调用GET /new_endpoint并检查响应是否正确。
这个解决方案有点难看，但是很有效！我认为调试它非常困难！