Headers: keys() method
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
keys()
Parameters
None.
Return value
Returns an iterator.
Examples
// 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
Browser compatibility
BCD tables only load in the browser