Problem Doing ODATA Request with XCSRF Token

[#1]

Hello everyone, 

I want to call an ODATA Endpoint of my RAP Service in my On Premise System, which is exposed via Cloud Connector in BTP
First, I have to fetch the 'x-csrf-token' via axios.get. Therefore, I encoded my username and password and add it to basic authentication. I receive a token from the response headers. With that token in the header I request my Entity, but after that I always get an error:  401 Not authorized

const axios = require("axios");

const sTokenUrl = "https://MYSYSTEMURL:MYPORT/sap/opu/odata/sap/MYSERVICE";
const sBase64UserNamePassword = "USERNAME:PASSWORD"; // This is Base64Encoded
const sServiceUrl = "https://MYSYSTEMURL:MYPORT/sap/opu/odata/sap/MYSERVICE/MYENTITY"

const oTokenResponse = await axios.get(sTokenUrl, {
            headers: {
                "x-csrf-token": "fetch",
                Authorization: `Basic ${sBase64UserNamePassword}`,
                Accept: "*/*",
                "Cache-Control": "no-cache",
                "Accept-Encoding": "gzip, deflate, br",
                Connection: "keep-alive",
            },
            withCredentials: true,
        });

const aCookies = oTokenResponse.headers["set-cookie"];
const sAuthToken = oTokenResponse.headers["x-csrf-token"];
const oHeaders = {
   "X-Csrf-Token": sAuthToken, 
   Accept: req.headers.accept,
   "Content-Type": req.headers["content-type"] ?? "application/json",
   "Cookie": aCookies.join(";")
};
try {
   const response = await axios.get(sServiceUrl, { headers: oHeaders });
} catch (oError) {
    console.log("Request Error:", oError.message);                   
}

If I do the same thing with Postman, it works. Can anybody help me with that ? 

Thanks
Daniel

[Ulrich_Schmidt1]

Best is probably to activate the ICM trace on backend side, here you can sometimes see details of why it is responding with 401. And the Traffic Trace in the SCC can also help, then you see the complete HTTP request and can compare what is different between Postman and axios.

[zaunaro]

Thanks, I did this already. I found out if I switched from axios to https.