Error: Content-Type is not allowed by Access-Control-Allow-Headers

Question

I am getting this error in Chrome when trying to send an ajax request:

Content-Type is not allowed by Access-Control-Allow-Headers

Everythi

Answer 1

Set up CORS (Cross-site HTTP Requests) in node. For me it looks like the following:

app.use('/api', function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type');
  next();
});

Answer 2

Solution for PHP:

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST,GET,OPTIONS');
header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');

(Need to send that before any other content)

Answer 3

I had the same problem and I solved it by adding the following header: Access-Control-Allow-Headers: content-type

Answer 4

I solved the problem adding to Apache Web Server virtual host configuration the following settings

Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Headers "Origin, X-Requested-With, Content-Type, Accept"

Answer 5

To me with PHP, localy works even if i set only this header setting:

header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');

Answer 6

for nginx

location / {
    proxy_pass http://localhost:59100;
    proxy_http_version 1.1;
    # proxy_set_header Upgrade $http_upgrade;
    # proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;

    # Simple requests
    if ($request_method ~* "(GET|POST)") {
      add_header "Access-Control-Allow-Origin"  *;
    }

    # Preflighted requests
    if ($request_method = OPTIONS ) {
      add_header "Access-Control-Allow-Origin"  *;
      add_header "Access-Control-Allow-Methods" "GET, POST, OPTIONS, HEAD";
      add_header "Access-Control-Allow-Headers" "Authorization, Origin, X-Requested-With, Content-Type, Accept";
    }

    # proxy_cache_bypass $http_upgrade;
    # add_header Access-Control-Allow-Origin *;
    # add_header Access-Control-Allow-Headers Content-Type;
}

see https://distinctplace.com/2017/04/17/nginx-access-control-allow-origin-cors/