Python: FastAPI error 422 with POST request when sending JSON data

by

Straight from the documentation:

The function parameters will be recognized as follows:

  • If the parameter is also declared in the path, it will be used as a path parameter.
  • If the parameter is of a singular type (like int, float, str, bool, etc) it will be interpreted as a query parameter.
  • If the parameter is declared to be of the type of a Pydantic model, it will be interpreted as a request body.”

So to create a POST endpoint that receives a body with a user field you would do something like:

from fastapi import FastAPI
from pydantic import BaseModel


app = FastAPI()


class Data(BaseModel):
    user: str


@app.post("https://stackoverflow.com/")
def main(data: Data):
    return data

More Related Contents:

  1. What is the proper way to make downstream Https requests inside of Uvicorn/FastAPI?
  2. FastAPI StreamingResponse not streaming with generator function
  3. How to send JSON or Form data to FastAPI backend through Axios JavaScript HTTP request?
  4. How to “log in” to a website using Python’s Requests module?
  5. Python Requests throwing SSLError
  6. Python Requests and persistent sessions
  7. MaxRetryError: HTTPConnectionPool: Max retries exceeded (Caused by ProtocolError(‘Connection aborted.’, error(111, ‘Connection refused’)))
  8. Can I set max_retries for requests.request?
  9. How to use cookies in Python Requests
  10. using requests with TLS doesn’t give SNI support
  11. Python Request Post with param data
  12. Upload Image using POST form data in Python-requests
  13. Unable to get local issuer certificate when using requests in python
  14. Fastest parallel requests in Python
  15. How to prevent python requests from percent encoding my URLs?
  16. How to receive json data using HTTP POST request in Django 1.6?
  17. FastAPI UploadFile is slow compared to Flask
  18. How to Download a File after POSTing data using FastAPI?
  19. How to allow any arbitrary query parameters using FastAPI and Swagger?
  20. What is the difference between ‘content’ and ‘text’
  21. parse multipart/form-data, received from requests post
  22. FastAPI – GET Request with Pydantic List field
  23. How to get the updated list of items in Jinja2 template using FastAPI?
  24. How to return a PDF file from in-memory buffer using FastAPI?
  25. Saving response from Requests to file
  26. Python Requests – SSL error for client side cert
  27. How to document default None/null in OpenAPI/Swagger using FastAPI?
  28. How to upload a CSV file in FastAPI and convert it into a Pandas Dataframe?
  29. Return a requests.Response object from Flask
  30. How to measure download speed and progress using requests?

Leave a Comment