Error: Expected 'OData-Version' header with value '4.0' but received value 'null' in response

[lukasz-sawicki]

OpenUI5 version: openui5-runtime-1.56.5

Browser/version (+device/version):Chrome/Laptop

Steps to reproduce the problem:

1. Trying to recreate ODATA V4 Tutorial using mock data on a local server created in werkzeug/python 3.6.5. This runs on http://localhost:4000
2. Metadata retrieved OK.
3. Call to http://localhost:4000/TripPinRESTierService/(S(LSA123))/People?$select=Age,FirstName,LastName,UserName&$skip=0&$top=10 ends with

Failed to get contexts for http://localhost:4000/TripPinRESTierService/(S(LSA123))/People with start index 0 and length 10 - Error: Expected 'OData-Version' header with value '4.0' but received value 'null' in response for http://localhost:4000/TripPinRESTierService/(S(LSA123))/People?$select=Age,FirstName,LastName,UserName&$skip=0&$top=10
at R.doCheckVersionHeader (https://sapui5.hana.ondemand.com/sdk/resources/sap/ui/core/library-preload.js:3564:314)

the response header:
HTTP/1.0 200
Content-Type: application/json; odata.metadata=minimal
Access-Control-Allow-Origin: *
OData-Version: 4.0
Content-Length: 1189
Server: Werkzeug/0.14.1 Python/3.6.5
Date: Sun, 26 Aug 2018 01:02:21 GMT

response body:
{
"@odata.context": "http://localhost:4000/TripPinRESTierService/(S(LSA123))/$metadata#People(Age,FirstName,LastName,UserName)",
"value": [
{
"Age": 23,
"FirstName": "Angel",
"LastName": "Huffman",
"UserName": "angelhuffman"
},
{
"Age": 44,
"FirstName": "Clyde",
"LastName": "Guess",
"UserName": "clydeguess"
},
{
"Age": 19,
"FirstName": "Elaine",
"LastName": "Stewart",
"UserName": "elainestewart"
},
{
"Age": 37,
"FirstName": "Genevieve",
"LastName": "Reeves",
"UserName": "genevievereeves"
},
{
"Age": 25,
"FirstName": "Georgina",
"LastName": "Barlow",
"UserName": "georginabarlow"
},
{
"Age": 19,
"FirstName": "Javier",
"LastName": "Alfred",
"UserName": "javieralfred"
},
{
"Age": 26,
"FirstName": "Joni",
"LastName": "Rosales",
"UserName": "jonirosales"
},
{
"Age": 41,
"FirstName": "Keith",
"LastName": "Pinckney",
"UserName": "keithpinckney"
},
{
"Age": 30,
"FirstName": "Krista",
"LastName": "Kemp",
"UserName": "kristakemp"
},
{
"Age": 29,
"FirstName": "Laurel",
"LastName": "Osborn",
"UserName": "laurelosborn"
} ]
}

[lukasz-sawicki]

ok. easier after getting some sleep.
origin url = localhost:8001, odata url localhost:4000. this will not work unless you turn off cors check at browser level or proxy localhost:8001/odata_service to localhost:4000

best regards