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questions's Issues

AJAX

  1. What is AJAX?
  2. How could we implement an AJAX request natively using JavaScript?

CORS

You mentioned in #1

const myInit = {
  method: "GET",
  headers: {
    Accept: "image/jpeg",
  },
  mode: "cors",
  cache: "default",
};
  1. What is CORS?
  2. What are the HTTP request and response headers that are used to handle CORS?
  3. What are the differences between Simple and Preflighted requests?
  4. When to consider CORS while working on a web application frontend?

Follow up
Is CORS a browser implementation? In other words, does mobile apps handle CORS? Try Postman

JS Promise

  1. What are JS promises?
  2. What are the problems that promises solve in JS world?
  3. Do you have to implement catch with every then method to catch the rejected promise? Is the following snippet valid?
returnsPromise()
.then(doSomething)
.then(doSomethingElse)
.catch(hadnleAnyError)

HTTP Verbs

You mentioned in #1

 xhr.open("GET", "user.json", true);

So,

  1. What are other common HTTP verbs?
  2. What are the differences between GET and POST?
  3. What is the purpose of each HTTP verb?
  4. Why cannot we use GET for all scenarios instead of using multiple HTTP verbs?

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