preflight

问题 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

问题 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,

问题 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? 回答1: 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. 回答2: Check for

问题 Ok so I have an Angular2 application running on http://localhost:4200/ , Inside this app I'm trying to call a function located in a seperate node.js application currently running on http://localhost:3000/ My call from the Angular2 application: deletePhoto(photoId: string) { var options = new RequestOptions({ headers: new Headers({ 'Accept': 'application/json', 'Access-Control-Allow-Origin': 'http://localhost:4200' }) }); let url = `http://localhost:3000/delete?photoId=${photoId}`; this.http

问题 According to samples from here: If a request uses methods other than GET, HEAD or POST. Also, if POST is used to send request data with a Content-Type other than application/x-www-form-urlencoded, multipart/form-data, or text/plain, e.g. if the POST request sends an XML payload to the server using application/xml or text/xml, then the request is preflighted . So in the following example, the pre-flight is carried out because of the XML Content-Type and the custom header X-PINGOTHER : var

问题 XMLHttpRequest cannot load http://192.168.1.253:8080/... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access. The response had HTTP status code 401. Pretty common error, with a great many possible solutions that haven't worked. I understand (I think) how CORS is supposed to work, and I don't see anything wrong with my HTTP headers, but it still doesn't work From Chrome: Request URL:http://192.168.1.253

问题 I'm getting an error while querying my oauth/token endpoint. I've configured cors enable for my resource / also tried to allow all resources but nothing worked. XMLHttpRequest cannot load http://localhost:8080/oauth/token. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:1111' is therefore not allowed access. The response had HTTP status code 401. vendor.js:1837 ERROR

问题 I have two VS projects : one exposing MVC5 controllers, the other being an angular client. I want the angular client to be able to query the controllers. I read numerous threads and tried the following : I added this in the server's web config: <system.webServer> <httpProtocol> <customHeaders> <clear /> <add name="Access-Control-Allow-Origin" value="*" /> </customHeaders> </httpProtocol> <system.webServer> I created and used the the following filter on the controller's action: public class

问题 I have two VS projects : one exposing MVC5 controllers, the other being an angular client. I want the angular client to be able to query the controllers. I read numerous threads and tried the following : I added this in the server's web config: <system.webServer> <httpProtocol> <customHeaders> <clear /> <add name="Access-Control-Allow-Origin" value="*" /> </customHeaders> </httpProtocol> <system.webServer> I created and used the the following filter on the controller's action: public class

问题 My function in an Angular service component to POST a request to create a new weather station with openweathermap.org: registerStation(registerWeatherStation: RegisterWeatherStation): Observable<Response> { let params = JSON.stringify(registerWeatherStation) console.log("params: ",params) let header = new Headers({'Content-Type': 'application/json; charset=utf-8'}) let options = new RequestOptions({ headers: header }) let url = this.servUrl + 'stations?appid=' + this.weatherAppId return this