Bearer token not recognized or passed on properly

Question

The below FastAPI application is supposed to send a Bearer token over to an external api, but I keep on getting 401 unauthorized. My first suspicion was that the actual token retrieved from the /token endpoint was coming empty or malformed, but it is not.

from fastapi import FastAPI
import httpx

app = FastAPI()

@app.get('/query')
async def getToken():
    async with httpx.AsyncClient(verify=False) as client:
        response = await client.get('https://myTokenApi.com/token')
        access_token = response.json().get("access_token")
        print(response.text)
        
        
        try:
            email = "myEmail@provider.com"
            response_api = await client.get(f"https://externalApi.com/email/{email}", headers={"Content-Type":"application/json", "Authorization": f"Bearer {access_token}"})
            print(response_api.status_code, response_api.text)
            print(response_api.raise_for_status())
        except httpx.HTTPStatusError as e:
            print(e)

        return response_api.json()


if __name__ == '__main__':
    import uvicorn

    uvicorn.run("main:app", host="0.0.0.0", port=3000, log_level="info", reload=True)

I can properly test it with insomnia or postman and both api's are responding just fine. I have also tried grabbing just access_token from the json being returned, to make sure i'm sending the right piece, but I still have an error:

An exception is raised saying this is not a valid JSON, but printing out all the stuff, it looks valid:

returned JSON {'access_token': 'xxxxxxxxxxxxxxxxxxxxxxSomething', 'expires_in': 3600, 'token_type': 'Bearer'}

The mentioned exception is

  raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Answer 1

The problem was at the header content. So, instead of

headers={"Content-Type":"application/json", "Authorization": f"Bearer {access_token}"

I moved the headers from the httpx "client" declaration to outside and replaced it by this:

headers={"Accept":"*/*", "Token": f"Bearer {access_token}"

i only figured this out when I was looking at the token endpoint curl request being genarated at the token app swagger. That was the reason behind the 401 response and utimately the json error