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.
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.
js
keys()
None.
Returns an iterator.
js
// Create a test Headers object const myHeaders = new Headers(); myHeaders.append("Content-Type", "text/xml"); myHeaders.append("Vary", "Accept-Language"); // Display the keys for (const key of myHeaders.keys()) { console.log(key); }
The result is:
content-type vary
| 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 |
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https://developer.mozilla.org/en-US/docs/Web/API/Headers/keys