Access Control Request Headers, is added to header in AJAX request with jQuery

Here is an example how to set a request header in a jQuery Ajax call:

$.ajax({
  type: "POST",
  beforeSend: function(request) {
    request.setRequestHeader("Authority", authorizationToken);
  },
  url: "entities",
  data: "json=" + escape(JSON.stringify(createRequestObject)),
  processData: false,
  success: function(msg) {
    $("#results").append("The result =" + StringifyPretty(msg));
  }
});

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This code below works for me. I always use only single quotes, and it works fine. I suggest you should use only single quotes or only double quotes, but not mixed up.

$.ajax({
    url: 'YourRestEndPoint',
    headers: {
        'Authorization':'Basic xxxxxxxxxxxxx',
        'X-CSRF-TOKEN':'xxxxxxxxxxxxxxxxxxxx',
        'Content-Type':'application/json'
    },
    method: 'POST',
    dataType: 'json',
    data: YourData,
    success: function(data){
      console.log('succes: '+data);
    }
  });

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What you saw in Firefox was not the actual request; note that the HTTP method is OPTIONS, not POST. It was actually the 'pre-flight' request that the browser makes to determine whether a cross-domain AJAX request should be allowed:

http://www.w3.org/TR/cors/

The Access-Control-Request-Headers header in the pre-flight request includes the list of headers in the actual request. The server is then expected to report back whether these headers are supported in this context or not, before the browser submits the actual request.

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Because you send custom headers so your CORS request is not a simple request, so the browser first sends a preflight OPTIONS request to check that the server allows your request.

https://i.stack.imgur.com/BTFel.png

If you turn on CORS on the server then your code will work. You can also use JavaScript fetch instead (here)

let url='https://server.test-cors.org/server?enable=true&status=200&methods=POST&headers=My-First-Header,My-Second-Header'; $.ajax({ type: 'POST', url: url, headers: { "My-First-Header":"first value", "My-Second-Header":"second value" } }).done(function(data) { alert(data[0].request.httpMethod + ' was send - open chrome console> network to see it'); });

Here is an example configuration which turns on CORS on nginx (nginx.conf file):

location ~ ^/index\.php(/|$) { ... add_header 'Access-Control-Allow-Origin' "$http_origin" always; add_header 'Access-Control-Allow-Credentials' 'true' always; if ($request_method = OPTIONS) { add_header 'Access-Control-Allow-Origin' "$http_origin"; # DO NOT remove THIS LINES (doubled with outside 'if' above) add_header 'Access-Control-Allow-Credentials' 'true'; add_header 'Access-Control-Max-Age' 1728000; # cache preflight value for 20 days add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; add_header 'Access-Control-Allow-Headers' 'My-First-Header,My-Second-Header,Authorization,Content-Type,Accept,Origin'; add_header 'Content-Length' 0; add_header 'Content-Type' 'text/plain charset=UTF-8'; return 204; } }

Here is an example configuration which turns on CORS on Apache (.htaccess file)

# ------------------------------------------------------------------------------ # | Cross-domain Ajax requests | # ------------------------------------------------------------------------------ # Enable cross-origin Ajax requests. # http://code.google.com/p/html5security/wiki/CrossOriginRequestSecurity # http://enable-cors.org/ # # Header set Access-Control-Allow-Origin "*" # #Header set Access-Control-Allow-Origin "http://example.com:3000" #Header always set Access-Control-Allow-Credentials "true" Header set Access-Control-Allow-Origin "*" Header always set Access-Control-Allow-Methods "POST, GET, OPTIONS, DELETE, PUT" Header always set Access-Control-Allow-Headers "My-First-Header,My-Second-Header,Authorization, content-type, csrf-token"

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And that is why you can't create a bot with JavaScript, because your options are limited to what the browser allows you to do. You can't just order a browser that follows the CORS policy, which most browsers follow, to send random requests to other origins and allow you to get the response that simply!

Additionally, if you tried to edit some request headers manually, like origin-header from the developers tools that come with the browsers, the browser will refuse your edit and may send a preflight OPTIONS request.

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Try to add 'Content-Type':'application/json':

 $.ajax({
        type: 'POST',
        url: url,
        headers: {
            'Content-Type':'application/json'
        }
        //OR
        //beforeSend: function(xhr) {
        //  xhr.setRequestHeader("My-First-Header", "first value");
        //  xhr.setRequestHeader("My-Second-Header", "second value");
        //}
    }).done(function(data) {
        alert(data);
    });

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From the client side, I can’t solve this problem.

From the Node.js and Express.js side, you can use the cors module to handle it.

var express    = require('express');
var app        = express();
var bodyParser = require('body-parser');
var cors       = require('cors');

var port = 3000;
var ip = '127.0.0.1';

app.use('*/myapi',
        cors(), // With this row OPTIONS has handled
        bodyParser.text({type: 'text/*'}),
        function(req, res, next) {
            console.log('\n.----------------' + req.method + '------------------------');
            console.log('| prot:' + req.protocol);
            console.log('| host:' + req.get('host'));
            console.log('| URL:' + req.originalUrl);
            console.log('| body:', req.body);
            //console.log('| req:', req);
            console.log('.----------------' + req.method + '------------------------');
            next();
        });

app.listen(port, ip, function() {
    console.log('Listening to port:  ' + port);
});

console.log(('dir:' + __dirname));
console.log('The server is up and running at http://' + ip + ':' + port + '/');

Without cors(), these OPTIONS have to appear before POST.

.----------------OPTIONS------------------------
| prot:http
| host:localhost:3000
| url:/myapi
| body: {}
.----------------OPTIONS------------------------

.----------------POST------------------------
| prot:http
| host:localhost:3000
| url:/myapi
| body: <SOAP-ENV:Envelope .. P-ENV:Envelope>
.----------------POST------------------------

The Ajax call:

$.ajax({
    type: 'POST',
    contentType: "text/xml; charset=utf-8",

    //These does not work
    //beforeSend: function(request) {
    //  request.setRequestHeader('Content-Type', 'text/xml; charset=utf-8');
    //  request.setRequestHeader('Accept', 'application/vnd.realtime247.sct-giro-v1+cms');
    //  request.setRequestHeader('Access-Control-Allow-Origin', '*');
    //  request.setRequestHeader('Access-Control-Allow-Methods', 'POST, GET');
    //  request.setRequestHeader('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type');
    //},
    //headers: {
    //  'Content-Type': 'text/xml; charset=utf-8',
    //  'Accept': 'application/vnd.realtime247.sct-giro-v1+cms',
    //  'Access-Control-Allow-Origin': '*',
    //  'Access-Control-Allow-Methods': 'POST, GET',
    //  'Access-Control-Allow-Headers': 'Origin, X-Requested-With, Content-Type'
    //},
    url: 'http://localhost:3000/myapi',
    data: '<SOAP-ENV:Envelope .. P-ENV:Envelope>',
    success: function(data) {
      console.log(data.documentElement.innerHTML);
    },
    error: function(jqXHR, textStatus, err) {
      console.log(jqXHR, '\n', textStatus, '\n', err)
    }
  });

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Try to use the rack-cors gem. And add the header field in your Ajax call.

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