preflight

问题 I'm trying to make a GET request to a Context Broker instance from a browser. I've enabled CORS on the CB using the -corsOrigin __ALL flag when starting the app, and I can see that this has worked by making a request in POSTMAN and seeing this header in the response: access-control-allow-origin →* . I need to specify the Fiware-Service header in my GET request in order to get the correct entities, which I believe is making the request not simple, triggering an OPTIONS HTTP request. Inspecting

问题 I am using Angular2, Communicating with a rest API, settings the header like so: import { Headers } from '@angular/http'; export const contentHeaders = new Headers(); contentHeaders.append('Accept', 'application/json'); contentHeaders.append('Content-Type', 'application/json'); contentHeaders.append('Authorization', localStorage.getItem('id_token')); Get request like items/ and POST request works, but when making GET requests for one item, like: items/579212a6541d5626732619c3 the server

问题 I'm upgrading my WebApi(s) to MVC6. In WebApi I could intercept every HTTP request and if it was a preflight I could respond with headers the browser would accept. I'm trying to figure out how to do the same thing in MVC6 WebApi. Here is the WebApi code. protected void Application_BeginRequest(object sender, EventArgs e) { if (Context.Request.Path.Contains("api/") && Context.Request.HttpMethod == "OPTIONS") { Context.Response.AddHeader("Access-Control-Allow-Origin", Context.Request.Headers[

问题 I found out that following issue occurs on safari via Javascript, jQuery Ajax: I make a cors simple request using GET Server responses with 302 Safari follows redirect but uses OPTIONS instead of GET as method, so it does a preflight request I would expect that step 3 would also invoke a simple request using GET, which is exactly how it is done in Chrome and Firefox. The problem is that the server who responses to the request after step 3 can not handle requests with method OPTIONS and

问题 I am using jquery-fileupload to allow users to upload files to an external service (Cloudinary to be more specific): <input type='file' name='file' class='cloudinary-fileupload' data-url='https://api.cloudinary.com/v1_1/wya/auto/upload' /> <script> $('.cloudinary-fileupload').fileupload(); </script> Since it is an external target, the browser initiates a CORS request. However, I noticed that the browser prepends a CORS preflight request. http://www.html5rocks.com/en/tutorials/cors/ gives

问题 If I respond to a cors request that includes access-control-request-method:PUT with response header access-control-allow-origin matching the origin and just access-control-allow-method:PUT and access-control-max-age:7200 will that be cached for 2 hours and always return only method PUT or will I be able to respond with just the specific method(s) requested if say the next request was access-control-request-method:POST? 回答1: If I respond to a cors request that includes access-control-request

问题 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:

问题 I know there a already lot of same solved issues here, but unfortunately none of them helped me :-(. Here my problem: I try to connect from my localhost to my REST service on a server. It works fine with a FF REST plugin, but my application results in following errors: OPTIONS http://.../my_REST_Service/ 401 (Unauthorized) XMLHttpRequest cannot load http://.../my_REST_Service/. Response for preflight has invalid HTTP status code 401 How I try to get the data I want: @Injectable() export class

问题 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

问题 I want to use an ajax-based component (KendoUI) to read/modify entities on an OData endpoint implemented by WCF DataServices. The service implementation was fairly easy in the first place: public class MyFooService : DataService<FooContext> { public static void SetEntitySetAccessRules(IDataServiceConfiguration config) { config.SetEntitySetAccessRule("Foos", EntitySetRights.AllWrite); } } Now I was expecting to be able to modify entities using PUT. KendoUI provides a nice and easy