Question about request of fastapi, request post - python-requests

Question

I use fastapi to build my web-server.
I need to know the ip address of client so I follow this guildline https://fastapi.tiangolo.com/advanced/using-request-directly/
This is my router function
from fastapi import Request
...
#router.post("/login")
async def login(id: str, password: str, request: Request):
My client do like this
import requests
...
response = requests.post(my_url, json={"id": id, "password": password})
But client gets this message:
{"detail":[{"loc":["query","dn"],"msg":"field required","type":"value_error.missing"},{"loc":["query","password"],"msg":"field required","type":"value_error.missing"}]}
Server gives this message:
"POST /jobs/login HTTP/1.1" 422 Unprocessable Entity
So I think the Request field is needed or the transmitted data format is wrong..
Is there any solution for this?

Answer 1

You'll have to explicitly tell FastAPI that you want to retrieve each parameter from the JSON body if you haven't defined a Pydantic input schema.
from fastapi import Request, FastAPI, APIRouter, Body
app = FastAPI()
router = APIRouter()
#router.post("/login")
async def login(request: Request, id: str = Body(...), password: str = Body(...)):
print(id, password)
app.include_router(router)
To define a schema for a login request, create a Pydantic class that inherits from BaseModel:
from fastapi import Request, FastAPI, APIRouter, Body
from pydantic import BaseModel
class LoginSchema(BaseModel):
id: str
password: str
app = FastAPI()
router = APIRouter()
#router.post("/login-schema")
async def login(request: Request, login: LoginSchema):
print(login.id, login.password)
app.include_router(router)

Answer 2

I think I found out what is the issue and why you get 422 Unprocessable Entity Error.
async def login(id: str, password: str, request: Request):
id and password are query parameters but you are trying to pass JSON data instead of query parameters.
response = requests.post(my_url, json={"id": id, "password": password})
If you want this code to work you should pass id and password as query parameters
import requests
my_url = "http://127.0.0.1:8000/login"
id = "1"
password = "hello"
params = {'id': id, 'password': password}
response = requests.post(my_url, params=params)
here is the whole code.
main.py
from fastapi import Request, FastAPI
app = FastAPI()
#app.post("/login")
async def login(id: str, password: str, request: Request):
ip = request.client.host
return {
"id":id,
"password": password,
"host": ip
}
test.py
import requests
my_url = "http://127.0.0.1:8000/login"
id = "1"
password = "hello"
params = {'id': id, 'password': password}
response = requests.post(my_url, params=params)