LoPy4 problem using HTTP requests

[Liudmila Dobriakova]

i'm trying to send the data from my LoPy4 board through Wi-Fi connection. I can get the socket library, but it seems to have a problem connecting to my service. it is running behind a firewall, so the domain name is resolved to IP in a wrong manner. So i was wondering is using urequests will solve the issue. But I can't install urequests on my LoPy4 board. Can't import upip neather. ImportError: no module named 'upip'. What i'm doing wrong?

[Developer Pydro]

@Liudmila-Dobriakova download the urequest.py file and place it in the lib folder.

Here is the urequest.py file from micropython github page: https://github.com/micropython/micropython-lib/blob/master/python-ecosys/urequests/urequests.py

[Liudmila Dobriakova]

@Developer-Pydro Thanx! i'll do so.
i managed to substitute the domain name with the IP, but now I'm facing the problem to perform POST request. I need to add the payload body as a JSON string. But it looks like it arrive empty to the service.
the request is made as follow:

httpreq = b'POST /sensordata/insertrecords HTTP/1.1 \r\n Host:XX.XXX.XXX.XXX \r\n' + 'Accept: application/json \r\n' + 'Content-Type: application/json\r\n\r\n' + ' {\"node_id\":\"1\",\"value\":[{\"measure_time_stamp\":\"2020-10-06T09:25:43\",\"temp\":\"14\",\"humidity\":\"75\",\"ph1\":11,\"ph2\":12,\"ph3\":13}]}'

any suggestion what is wrong with the format?

[jcaron]

@Liudmila-Dobriakova you have lots of extra spaces at the beginning or end of your header lines, not sure those are allowed.

[Liudmila Dobriakova]

@jcaron Do u mean "\r\n" ? i tried to remove them.. at the end they are mandatory otherwise the request is not sent at all. How would u suggest modifying the string?

[jcaron]

@Liudmila-Dobriakova I mean the spaces before and/or after the ˋ\r\n`.

You are probably also missing a Content-Length.