GET to Flask server; Status code: 200 vs. Status code 606

[LukasSliacky]

Hi guys, first of all: Thanks for your great project... I am using your driver located here: Drivers/SIM800L.py

I don't know where can be a problem and i am writing here entire my scenario and specific information which i know:

I am using latest version:

modem.get_info()
> 'SIM800 R14.18'

and my device is connected on Internet:

modem.get_ip_addr()
>> '100.67.x.x'

# or

url = 'http://checkip.dyn.com/'
response = modem.http_request(url, 'GET')
print('Response status code:', response.status_code)

>> Response status code: 200

All these my experiments are okay.

And here is my problem:

My webserver is based on Flask (with NGINX server) and i have simple and basic endpoint:

@blueprint.route('/api/', methods=['GET'])
def index():
    request_status = {'status': 'OK'}
    return jsonify(request_status), 200

When i try simple request to my API with requests library ("normal" Python 3.5+):

import requests
r = requests.get('https://ha.datain.app/api/')
print(r.status_code, '/ ', r.content)

>> 200 / b'{"status":"OK"}\n'

And everything looks good...

But when i try similar request to API over my TTGO T-Call SIM800 with code:

print('\nNow running demo http GET...')
url = 'https://ha.datain.app/api/'
response = modem.http_request(url, 'GET')
print('Response status code:', response.status_code)
print('Response content:', response.content)

i see response:

Response status code: 606
Response content: 

A am pasting here all info from your additional log:

=== url = 'https://ha.datain.app/api/'
=== response = modem.http_request(url, 'GET')
=== print('Response status code:', response.status_code)
=== print('Response content:', response.content)

Now running demo http GET...
DEBUG: Writing AT command "b'AT+SAPBR=2,1\r\n'"
DEBUG: Read "b'AT+SAPBR=2,1\r\r\n'"
DEBUG: Read "b'+SAPBR: 1,1,"100.67.239.103"\r\n'"
DEBUG: Read "b'\r\n'"
DEBUG: Detected pre-end
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b'+SAPBR: 1,1,"100.67.239.103"'"
DEBUG: Close the http context if left open somehow...
DEBUG: Writing AT command "b'AT+HTTPTERM\r\n'"
DEBUG: Read "b'AT+HTTPTERM\r\r\n'"
DEBUG: Read "b'ERROR\r\n'"
DEBUG: Http request step #1.1 (inithttp)
DEBUG: Writing AT command "b'AT+HTTPINIT\r\n'"
DEBUG: Read "b'AT+HTTPINIT\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
DEBUG: Http request step #1.2 (sethttp)
DEBUG: Writing AT command "b'AT+HTTPPARA="CID",1\r\n'"
DEBUG: Read "b'AT+HTTPPARA="CID",1\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
DEBUG: Http request step #1.3 (enablessl)
DEBUG: Writing AT command "b'AT+HTTPSSL=1\r\n'"
DEBUG: Read "b'AT+HTTPSSL=1\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
DEBUG: Http request step #2.1 (initurl)
DEBUG: Writing AT command "b'AT+HTTPPARA="URL","https://ha.datain.app/api/"\r\n'"
DEBUG: Read "b'AT+HTTPPARA="URL","https://ha.datain.app/api/"\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
DEBUG: Http request step #2.2 (doget)
DEBUG: Writing AT command "b'AT+HTTPACTION=0\r\n'"
DEBUG: Read "b'AT+HTTPACTION=0\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Read "b'\r\n'"
DEBUG: Detected pre-end
DEBUG: Read "b'+HTTPACTION: 0,606,0\r\n'"
DEBUG: Detected startwith end (and adding this line to theoutput too)
DEBUG: Returning "b'OK+HTTPACTION: 0,606,0'"
DEBUG: Response status code: "606"
DEBUG: Http request step #4 (getdata)
DEBUG: Writing AT command "b'AT+HTTPREAD\r\n'"
DEBUG: Read "b'AT+HTTPREAD\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
DEBUG: 
DEBUG: Http request step #4 (closehttp)
DEBUG: Writing AT command "b'AT+HTTPTERM\r\n'"
DEBUG: Read "b'AT+HTTPTERM\r\r\n'"
DEBUG: Read "b'OK\r\n'"
DEBUG: Detected exact end
DEBUG: Returning "b''"
Response status code: 606
Response content: 

I think that "problem" is probably on my server, but unfortunately i don't understand, how to prepare my endpoint for request from your modem driver. Please, can you help me with server response what you expecting it?

Thank you for your support. Lukas Sliacky