Axios post request is being denied by flask made api. CORS error coming up [duplicate] - reactjs

Question

This question already has an answer here:
cors enable in Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers in preflight response
(1 answer)
Closed 2 years ago.
I am trying to add user from my react application through an API made with flask. But the post request is getting in error with the following error.
'http://localhost:5000/api/v1.0/add' from origin 'http://localhost:3000' has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.
my axios code is following
const params = {
user_name : '5678234121',
passwd : 'password',
location : 'Kolkata',
pin_code : '700019',
secret_ques: 'What is your mother s maiden name?',
answr : 'aba',
status : 'Active',
remarks : 'test data'
};
const res = await Axios.post(
'http://localhost:5000/api/v1.0/add', params, {
headers: {
'content-type': 'application/json',
'Access-Control-Allow-Origin' : '*',
'Access-Control-Allow-Methods' : 'GET,PUT,POST,DELETE,PATCH,OPTIONS',
},
});
console.log(res.data);
my flask code is following
#app.route('/api/v1.0/add', methods=["POST"])
def add():
con = None
db = datadir + datafile
try:
_json = request.json
_name = _json['user_name']
_psswd = _json['passwd']
_locatn = _json['location']
_pincd = _json['pin_code']
_secrt = _json['secret_ques']
_ans = _json['answr']
_stat = _json['status']
_remks = _json['remarks']
# validate the received values
if _name and _psswd and _pincd and request.method == 'POST':
#do not save password as a plain text
_hashed_password = base64.b64encode(_psswd.encode("utf-8"))
# save edits
sql = '''INSERT INTO user_mast(user_name, passwd, location, pin_code, secret_ques, answr, status, remarks ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)'''
data = (_name, _hashed_password.decode('ASCII'), _locatn, _pincd, _secrt,_ans, _stat, _remks , )
con = sqlite3.connect( db ) # Connection to database
cur = con.cursor()
cur.execute(sql, data)
con.commit()
resp = jsonify({'Status' : 'User added successfully!'})
resp.status_code = 200
else :
resp = jsonify ({'Status' :'Mandatory fields: Name,Password,Pincode missing..'})
resp.status_code = 502
except sqlite3.Error as e:
resp = jsonify({'Status' :'Database Error'})
resp.status_code = 500
except Exception as e:
print(e)
resp = jsonify({'Status' :'Unknown Error : Contact Administrator'})
resp.status_code = 501
finally:
cur.close()
con.close()
return resp
Please help me to fix the error, going clueless about this.

Answer 1

If you're new to this, I'd recommend just adding Flask-CORS to your application and not futzing around with the headers.