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const req_url = 'http://localhost:5000/'
let resp = fetch(req_url, {
  method: 'POST',
  mode: 'no-cors',
  headers: new Headers({
    'Authorization'              : 'Basic dXNlcjpwd2Q=', // user:pwd
  }),
}).then((resp) => resp)

// или так
let headers = new Headers()
headers.append('Authorization', 'Basic Y2lhdDpwd2Q=')
let resp = fetch(req_url, {
  method: 'POST',
  mode: 'no-cors',
  headers: headers,
  credentials: 'include'
}).then((resp) => resp)

// или даже так
let headers = new Headers()
headers.append('Authorization', 'Basic Y2lhdDpwd2Q=')
let resp = fetch(req_url, {
  method: 'POST',
  mode: 'no-cors',
  headers: headers,
  credentials: 'include'
}).then((resp) => resp)

#!/usr/bin/env python3
from functools import wraps
from flask import Flask, request, Response

app = Flask(__name__)

def check_auth(username, password):
    return username == 'user' and password == 'pwd'

def authenticate():
    return Response(
    'Could not verify your access level for that URL.n'
    'You have to login with proper credentials', 401,
    {'WWW-Authenticate': 'Basic realm="Login Required"'})

def requires_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        auth = request.authorization
        if not auth or not check_auth(auth.username, auth.password):
            return authenticate()
        return f(*args, **kwargs)
    return decorated

@app.route('/', methods=['POST', 'GET'])
@requires_auth
def secret_page():
    return """
        <!doctype HTML>
        <html>
        <head></head>
        <body><h1>Success!</h1></body>
        </html>
    """


if __name__ == '__main__':
    app.run(debug=True)

const req_url = 'http://localhost:5000/'
let resp = fetch(req_url, {
method: 'POST',
mode: 'no-cors',
headers: {
  'Authorization'              : 'Basic dXNlcjpwd2Q=',
},

}).then((resp) => resp)