preflight

I am trying to make an AJAX call (CORS) using the below code: $.ajax({ type: "POST", url: 'http://localhost/MySpace', success: function(result) { console.log(result); }, error: function() { console.log("error"); }, }); I am running the above code from: http://127.0.0.1/Test/index.html The PHP Code written at http://localhost/MySpace is as below: <?php header("Access-Control-Allow-Origin: *"); echo "Hello"; ?> As per my understanding, this should have worked. However I am getting this error: XMLHttpRequest cannot load http://localhost/MySpace. No 'Access-Control-Allow-Origin' header is present

I have built an API (api.example.com) and want it to be accessible from www.example.com I also want it to be accessible from other domains. For that I have added Access-Control-Allow-Origin: * But when I open www.example.com, a preflight request (OPTIONS request) is sent before all the api requests How do I stop multiple preflight request ? I think there should be only one preflight request, what am I doing wrong !!! ? Or is it natural that browser has to send preflight request before each and every call ? Note: I dont want to use JSONP as I am making it publicly accessible Access-Control

I have to make web service call from my websites to thirdparty domain/server. While I am making this call using jQuery Ajax by Post method with content-type:text/plain and it is working fine. But while I am changing it to content-type: text/xml it is throwing: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Even it set on thirdparty server to allow access to our website. And we are getting this header while making call with content-type:text/plain. We have also added following on Thirdparty server.

So I know there's a lot of CORS posts out there, and I'm just adding to them, but I can't find any with answers that help me out. So I'm building an angular 4 application that relies on my php api. Working locally it's fine, the moment I toss it up on the domain with the app at app.example.com , and the api at api.example.com , I can't get past my login, because I get the following error: XMLHttpRequest cannot load http://api.example.com/Account/Login . Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

I'm a bit confused about the security aspects of CORS POST requests. I know there is a lost of information about this topic online, but I couldn't find a definite answer to my questions. If I understood it correctly, the goal of the same-origin policy is to prevent CSRF attacks and the goal of CORS is to enable resource sharing if (and only if) the server agrees to share its data with applications hosted on other sites (origins). HTTP specifies that POST requests are not 'safe', i.e. they might change the state of the server, e.g. by adding a new comment. When initiating a CORS request with

I am working with an Angular 2 & Ionic 2 app. I had to change to another server for testing and the API has stopped working with the below error message: Response for preflight has invalid HTTP status code 403 I added this to .htaccess <IfModule mod_headers.c> Header append Vary User-Agent env=!dont-vary Header add Access-Control-Allow-Origin "*" Header add Access-Control-Allow-Headers "origin, x-requested-with, content-type" Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS" </IfModule> This on my angular provider: loginUser(data): Observable<any> { let username: string

I am using react to send data to my API. Every POST request I make gives me an OPTIONS request, and I need to fix this. I think I might need to do some preflight structure but after reading about it I still do not know how to implement it. At the moment I am connecting to my API as so... fetch('http://localhost:8080/login', { method: 'POST', mode:'cors', headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' }, body: JSON.stringify({ username: this.state.username, password: this.state.password }) }); This is called onSubmit . I am sending some data to my POST request so I

A CORS preflight request obviously uses the OPTIONS method and has an Origin header. However, a browser can decide for any HTTP request to add an Origin header. Also, OPTIONS may be used for other functionality than CORS. (How) Can I identify exactly (without false positives or negatives) whether a request is a CORS preflight request? Check for the Access-Control-Request-Method header. It would not make much sense to send it in a request other than the preflight request. Matheus Felipe Check for the existence of these essential information present in a preflight request: The request's HTTP