web api instance method
Headers: keys() method
Available in workers
The Headers.keys() method returns an
iterator allowing to go through all keys contained
in this object. The keys are String objects.
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
Specifications
SpecificationsStandards references are available on the canonical MDN page.
Browser compatibility
Browser compatibilityCompatibility data is available on the canonical MDN page.