8 Questions
What is the primary advantage of the Fetch API over XMLHttpRequest?
Fetch API is promise-based, while XMLHttpRequest is callback-based.
What is the purpose of the json() method in the Fetch API?
It converts the response body to a JSON object.
Which Content Security Policy directive controls Fetch requests?
connect-src
What does the fetch() method return initially?
A promise that resolves with a Response object.
Which statement about the Response object is correct?
It is a representation of the entire HTTP response.
What is the purpose of the fetch() method in the Fetch API?
It provides an easy way to fetch resources asynchronously across the network.
Which of the following is a feature of the Fetch API?
It integrates advanced HTTP concepts such as CORS and other extensions to HTTP.
What is the purpose of the Fetch API?
It provides a JavaScript interface for accessing and manipulating parts of the HTTP protocol, such as requests and responses.
Study Notes
The Fetch API
- Provides a JavaScript interface for accessing and manipulating parts of the protocol, such as requests and responses.
- Offers a global fetch() method for fetching resources asynchronously across the network.
Key Features of Fetch
- Promise-based API, unlike XMLHttpRequest which is callback-based.
- Integrates advanced HTTP concepts like CORS and other extensions to HTTP.
Fetch Request
- A basic fetch request involves fetching a resource, parsing it, and printing the data to the console.
- The simplest use of fetch() takes one argument - the path to the resource you want to fetch.
- Returns a promise that resolves with a Response object, not the JSON response body directly.
Response Object
- Represents the entire HTTP response.
- Does not directly contain the actual JSON response body.
- The json() method is used to extract the JSON body content from the Response object, returning a second promise that resolves with the result of parsing the response body text as JSON.
Fetch Request Control
- Controlled by the connect-src directive of Content Security Policy.
- Not controlled by the directive of the resources it's retrieving.
Explore the features and advantages of the Fetch API in JavaScript for making asynchronous network requests. Learn about the promise-based approach, integration of advanced HTTP concepts, and the global fetch() method that simplifies resource fetching.
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