Try application/xml instead of text/xml for content type.

If it does not help, check API docs for correct type.

For accept try */*.

Atelier 1.3 released.

I mean response body may contain additional info

print(response.content)

Check response with 500 error code, it probably contains error information

201 looks like a correct response.

500 on the other hand is an error. Check what's the error.

What's the status_code on

            response = session.post(getPropertyUrl(property), params= {"type":"%Numeric", "path": property, "unique":0}, headers=header)
            print(response.status_code)

It actually doesn't create neither database or property.

Check that %Service_DocDB is enabled. Your screenshot also shows that database gets created.

if I have 20 properties... this would be a long code

You need to cycle over all properties, so +2 lines probably.

Made an erro in URL, it's not  .../db/DBName/Propname but .../prop/db/DBName/Propname.

Here's a sample code that creates a db and a property.

import requests

def getBaseUrl(host = "127.0.0.1", port = 52773,  namespace = "user", db = "test"):
    return "http://{}:{}/api/docdb/v1/{}/db/{}" .format(*[host, port, namespace, db])

def getPropertyUrl(property, host = "127.0.0.1", port = 52773,  namespace = "user", db = "test"):
    return "http://{}:{}/api/docdb/v1/{}/prop/{}/{}" .format(*[host, port, namespace, db, property])

def main():

    url = getBaseUrl()
    print(url)
    header = {
        'Content-Type': 'application/json',
    }

    session = requests.Session()
    session.auth = ("_SYSTEM", "SYS")

    response = session.get(url, headers=header)
    #response = requests.get(url, headers=header)
print(response.status_code)  # Number of error
if response.status_code == 404:
        print('DB not found, create DB ...')
        response = session.post(url, headers=header)
        print(response.status_code)
    elif response.status_code != 200:
        print('Unknown error: ' + response.status_code + ' ' + response.reason)
    else:
        property = "Ergebniszuf"
# check that property exist
response = session.get(getPropertyUrl(property), headers=header)

        if response.status_code == 404:
            print('Property not found, creating property: ' + property)
            response = session.post(getPropertyUrl(property), params= {"type":"%Numeric", "path": property, "unique":0}, headers=header)
            print(response)
        elif response.status_code != 200:
            print('Unknown error: ' + response.status_code + ' ' + response.reason)
        else:

            print('DB found, load data...')

    return 1
if __name__ == '__main__':
    print(main())

Interesting. Check this article - I think you'll need either HTTP Debugging proxy (probably) or Packet analyzer (maybe) to debug this further.

As you have reference implementation (Postman) you can start by comparing Postman request/response and Ensemble request/response using HTTP Debugging proxy.

When you get sc=1 , what about:

set resp=httpRequest.HttpResponsezw resp
do resp.Data.OutputToDevice()

Compare output of

Set sc = httpRequest.Post("/sample/", 1)

with what Postman sends.

Also, what does

Set sc = httpRequest.Post("/sample/")
zw sc

show?

Yes, it would work.