FastAPI POST endpoint returning "Field required" when sending dictionary from Jython

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1

Hi everyone,

I'm trying to use a POST method:

h = {"accept": "application/json", "Content-Type": "application/json"}

client = system.net.httpClient()
response = client.post(url, data=data, headers=h)
response.json

data is a dictionary.

I get this error:

{'detail': [{'msg': 'Field required', 'loc': ['body'], 'type': 'missing', 'input': None}]}

For context, I’m using FastAPI for my API.

The endpoint is defined like this:

@app.post("/item")
def update_item(new_item: Item):
    ...

And the Item model looks like this:

class Item(BaseModel):
    t_stamp: str
    temp_1: float
    hum_1: float
    temp_2: float
    hum_2: float
    temp_3: float
    hum_3: float
    temp_4: float
    hum_4: float
    temp_5: float
    hum_5: float
    temp_6: float
    hum_6: float

The perplexing part is that if I use httpPost instead, it works fine:

import json

# Convert dictionary to JSON string
json_string = json.dumps(data)

# Use httpPost directly
response = system.net.httpPost(url, contentType="application/json", postData=json_string)

Thanks in advance for any help or advice

2

what happens if you try passing in json.dumps(data) to httpClient?

3

Can you share the actual dictionary you're sending?

What if you send your data to a testing tool like that echoes what you requested back to you?
I like http://httpbin.org/, though it appears to be down at the moment. It's self hostable via Docker: https://hub.docker.com/r/kennethreitz/httpbin/