Headers.keys()
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.
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
BCD tables only load in the browser