Obsolete since Gecko 52 (Firefox 52 / Thunderbird 52 / SeaMonkey 2.49)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
getAll() method of the
Headers interface used to return an array of all the values of a header within a
Headers object with a given name; in newer versions of the Fetch spec, it has been deleted, and
Headers.get() has been updated to fetch all header values instead of only the first one.
If the requested header doesn't exist in the
Headers object, it returns an empty array.
- The name of the HTTP header whose values you want to retrieve from the
Headersobject. If the given name is not the name of an HTTP header, this method throws a
Creating an empty
Headers object is simple:
var myHeaders = new Headers(); // Currently empty
You could add a header to this using
Headers.append, then retrieve it using
myHeaders.append('Content-Type', 'image/jpeg'); myHeaders.getAll('Content-Type'); // Returns [ "image/jpeg" ]
If the header has multiple values associated with it, the array will contain all the values, in the order they were added to the Headers object:
myHeaders.append('Accept-Encoding', 'deflate'); myHeaders.append('Accept-Encoding', 'gzip'); myHeaders.getAll('Accept-Encoding'); // Returns [ "deflate", "gzip" ]
Headers.get to return only the first value added to the
The definition of 'getAll()' in that specification.
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
|Basic support||42 — 60||42 — 60||Yes||No||29 — 47||No||?|
1. From version 34: this feature is behind the
dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.