Progressive Web Application Development by Example: Develop fast, reliable, and engaging user experiences for the web by Chris Love

Author:Chris Love [Love, Chris]
Language: eng
Format: epub, pdf
Tags: COM060090 - COMPUTERS / Internet / Application Development, COM060180 - COMPUTERS / Web / Web Services and APIs, COM051260 - COMPUTERS / Programming Languages / JavaScript
Publisher: Packt Publishing
Published: 2018-07-23T23:00:00+00:00

Accessing Header values

The get method returns a specific headers value:

Var cacheHeader = myHeaders.get('Cache-Control'); //returns 'private, max-age=3600, s-max-age=300'

The entries method returns an iterator you can use to loop through all the headers. Each entry is a simple array, with the first entry being the header key name and the second member being the value:

// Display the key/value pairs for (var header of myHeaders.entries()) { console.log(header[0]+ ': '+ header[1]); }

The keys method also provides an iterator, but only returns a list of header names:

// Display the keys for(var key of myHeaders.keys()) { console.log(key); }

Conversely, you can get a list of values from the values method. The problem with this method is that the values are not directly correlated to their keys:

// Display the values for (var value of myHeaders.values()) { console.log(value); }

You can check if a header exists by calling the has method:

myHeaders.has(name);

A header can be removed using the delete method:

myHeaders.delete(name);

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