al-amiir / questions

I'm Al-Amir

From Egypt

about me:

• I’m always starving for a new skill to learn & a challenge to conquer.

• I’m currently working @RushBrush,INC.

• How to reach me [email protected].

• Here is my updated Resume.

• Check out my Latest Portfolio, and my first Portfolio.

• I’m looking to collaborate on OpenSource Projects.

• Fun fact I love fashion, animations, colors, coding, art and go to the GYM very often.

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Skills and tools:

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my github stats:

Note: Top languages is only a metric of the languages my public code consists of and doesn't reflect experience or skill level.

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connect with me:

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questions's Issues

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?

AJAX

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

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)

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