The Headers.keys() method returns an iterator allowing to go through all keys contained in this object. The keys are String objects.
Note: This method is available in Web Workers.
Headers.keys()
Syntax
keys()
Return value
Returns an iterator.
Examples
// Create a test Headers object var myHeaders = new Headers(); myHeaders.append('Content-Type', 'text/xml'); myHeaders.append('Vary', 'Accept-Language'); // Display the keys for(var key of myHeaders.keys()) { console.log(key); }
The result is:
content-type vary
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
keys |
42
|
16
|
44
|
No
|
29
|
10.1
|
42
|
42
|
44
|
29
|
10.3
|
4.0
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Headers/keys
