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This feature is obsolete.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.
This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||41 behind pref
34 behind pref
|Feature||Android||Firefox Mobile (Gecko)||Firefox OS (Gecko)||IE Phone||Opera Mobile||Safari Mobile||Chrome for Android|
|Basic support||No support||No support||No support||No support||No support||No support||No support|