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The XMLHttpRequest.withCredentials property is a Boolean that indicates whether or not cross-site Access-Control requests should be made using credentials such as cookies, authorization headers or TLS client certificates. Setting withCredentials has no effect on same-site requests.

In addition, this flag is also used to indicate when cookies are to be ignored in the response. The default is false. XMLHttpRequest from a different domain cannot set cookie values for their own domain unless withCredentials is set to true before making the request. The third-party cookies obtained by setting withCredentials to true will still honor same-origin policy and hence can not be accessed by the requesting script through document.cookie or from response headers.

Note: This never affects same-site requests.

Note: XmlHttpRequest responses from a different domain cannot set cookie values for their own domain unless withCredentials is set to true before making the request, regardless of Access-Control- header values. 

Example

var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://example.com/', true);
xhr.withCredentials = true;
xhr.send(null);

Specifications

Specification Status Comment
XMLHttpRequest Living Standard WHATWG living standard

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes123.51102124
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes ?41 Yes ? Yes

1. Starting with Firefox 11, it's no longer supported to use the withCredentials attribute when performing synchronous requests. Attempting to do so throws an NS_ERROR_DOM_INVALID_ACCESS_ERR exception.

2. Internet Explorer versions 8 and 9 supported cross-domain requests (CORS) using XDomainRequest

Document Tags and Contributors

Contributors to this page: Sheppy, ExE-Boss, erikadoyle, teoli, MashKao, fscholz, jsx
Last updated by: Sheppy,