如何将http请求转换为Python？

Question

I need your help.

I am looking to communicate with a REST API containing sensor data at port number 3. I have a Json (POST) request that works perfectly executed on a REST client like Insomnia.

My request :

{ "header": { "portNumber": 3 }, "data": { "index": 40 } }

Picture of my request

However I am unable to make it work on Python and to recover data from my sensor.

My Python code :

import requests
import json

url = 'http://192.168.1.100/iolink/sickv1' # Address of the OctoPrint Server
header = {'portNumber': '3', 'Content-Type': 'application/json'} #Basic request's header
data = {'index': 40}


def get_sensor_measure():

r = requests.post(url + '/readPort', headers=header, data=data)

print(r.content)
print(r.status_code)

I get the error:

b'{"header":{"status":1,"message":"Parsing Failed"}}'

Thank you in advance

Answer 1

You should pass 'portNumber': '3' in data not in header :

header = {'Content-Type': 'application/json'}
data = {'header': {'portNumber': '3'}, 'data': {'index': 40}}

And also as Karl stated in his answer you need to changes data to json :

r = requests.post(url + '/readPort', headers=header, json=data)

Answer 2

My guess would be that you are using the wrong field to pass your payload. It isn't really obvious, but the requests package expects JSON-type payload to be sent with the json field, not the data field, ie:

r = requests.post(url + '/readPort', headers=header, json=data)

Answer 3

With a few changes (Bold), it works. Thanks

url = 'http://192.168.1.100/iolink/sickv1' # Address of the OctoPrint Server
    header = {'Content-Type': 'application/json'} #Basic request's header
    **data = {'header': {'portNumber': 3}, 'data': {'index': 40}}**

    def get_sensor_measure():

        r = requests.post(url + '/readPort', headers=header, json=data)

        print(r.content)
        print(r.status_code)