The Headers.keys()
method returns an iterator
allowing to go through all keys contained in this object. The keys are ByteString
objects.
Note: This method is available in Web Workers.
Syntax
headers.keys();
Return value
Returns an iterator
.
Example
// 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
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 45 |
Edge
Full support 16 |
Firefox
Full support 44 |
IE
No support No |
Opera
Full support 32 |
Safari
? |
WebView Android
Full support 45 |
Chrome Android
Full support 45 |
Firefox Android
Full support 44 |
Opera Android
Full support 32 |
Safari iOS
No support No |
Samsung Internet Android
Full support 5.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
See also
Headers.keys() by Mozilla Contributors is licensed under CC-BY-SA 2.5.