Headers: keys() method

Note: This feature 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.

Syntax

js
keys()

Parameters

None.

Return value

Returns an iterator.

Examples

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

Specifications

See also