HTTPQuestions: A repository from uthrakrishnan

HTTP Questions

URLs

Name all of the parts of the url that you can remember. In your own words describe what they do.

 1. Protocol - sets http or https
 2. domain - the local host
 3. port 
 4. path - the path within the domain you want
 5. query string
 6. anchor tag - the part on the webpage you would like to access

Name the pieces of the following urls:
- https://www.google.com/
```
 Protocol://domain
```
- https://workbook.galvanize.com/cohorts/41/learning_experiences/367
```
 Protocol://domain/path
```
- http://locahost:5000/animals/puppies?onlycute=1&size=medium#firstpuppy
```
 protocol://domain:port/path?queryString#anchortag
```
- https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#4xx_Client_Error
```
 protocol://domain/path#anchortag
```
Can a server use more than 1 prt?
```
 Yes.
```
Why is https different than http?

As compared to http, when using HTTPS, the computers agree on a "code" between them, and then they scramble the messages using that "code" so that no one in between can read them. ```

How does a server interpret the following url's query paramter. What data structure does it create on the server?

 http://locahost:5000/animals?puppies=fido&puppies=max&puppies=moxie

 It creates an array named puppies with elements of fido, max, and moxie.

HTTP Request/Response

Name at least 4 http verbs
```
 Get, post, delete, put, patch
```

What is each verb useful for in your own words

 Get - get info from a server
 Post - post/send info to a server
 Delete - delete info from a server
 Patch/Put - change an existing resource on a server.

What does idempotent mean?

 that the operation does not change the data.

Name the 5 http status code ranges. What are they used for in general?

 100 - Getting there soon
 200 - ok
 300 - redirect
 400 - client side error
 500 - server side error

If a server returns a http status code of 301 and a location of https://www.google.com/, what does the browser do?
```
 it permanently redirects the request.
```
For the following HTTP headers, decide if the following header is used for requests, responses or both:
- Accept
```
 Request
```
- Content-type
```
 Response
```
- User-agent
```
 Request
```
- Set-cookies
```
 Response
```
- Cache-control
```
 Both
```
- Cookie
```
 Request
```
Is the following a http request or response? How do you know for each?

HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Vary: Accept
Content-Type: text/html; charset=utf-8
Content-Length: 722
ETag: W/"2d2-Wu0We9N5g35FXWY+gOATLA"
Date: Tue, 08 Mar 2016 20:37:11 GMT
Connection: keep-alive

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <link rel="stylesheet" href="/style.css">
    <title>Student Roster</title>
  </head>
  <body>
    <main>
      <h1>Student Roster</h1>
      
        <section>
          <h3>Daenerys Targaryen</h3>
          <span>Student Id: nys8fbohl</span>
          <h4>Hobby: Motherhood</h4>
          <img src="https://i.imgur.com/KlycRG5.jpg" alt="Daenerys Targaryen" />
        </section>
      
        <section>
          <h3>Tyrion Lannister</h3>
          <span>Student Id: njehukbohe</span>
          <h4>Hobby: Traveling</h4>
          <img src="https://i.imgur.com/fFMusdC.png" alt="Tyrion Lannister" />
        </section>
      
    </main>
  </body>
</html>

This is a response as there is a content-type header and it's returning the HTML structure of a page.

DELETE /students/n1vmyrw3x HTTP/1.1
Host: g22-students.herokuapp.com
Accept: application/json
Cache-Control: no-cache
Postman-Token: 0041e3c3-efdb-f0c3-b2f4-2d79f6d0f44b

This is a request as DELETE is a request verb

JSON

Describe what JSON is. What is it used for.

JSON is JavaScript Object Notation which is a string of data that is used to exchange data on the web.

Convert the following map into a javascript object then console log the age.

{ "company" : "Github", "age": 7, "categories" : "Services,Internet,Software"}

var GitHub = JSON.parse('{ "company" : "Github", "age": 7, "categories" : "Services,Internet,Software"}');
console.log(Github.age);

Convert the following to a javascript object. Console log each company name.

{ "Companies":[ { "company": "Github", "age": 7, "categories": "Services,Internet,Software"},
              { "company": "Airbnb", "age": 6, "categories": "Hotels,Travel"},
              { "company": "Square", "age": 7, "categories": "FinTech,Hardware + Software,Finance"},
              { "company": "Dropbox", "age": 11, "categories": "Cloud Data Services,Storage,Web Hosting"}
            ]
}

The following is javascript. Convert the object to a string and console log it.

var myObj = {
  company: "Galvanize",
  age: 3,
  categories: "Education"
};

console.log(JSON.stringify(myObj));

MISC

Describe what DNS is.
In the terminal, type man curl. Look at the man page for curl. What do the following flags do? -v, -X. (Hint: to search for a string, type / then the text you want, then enter. To quit the man page, type q).
What is TCP/IP? How does it interact with HTTP?
Does HTTP break the data that is being sent into small packets? If not, what protocol is responsible for it?

uthrakrishnan/HTTPQuestions

HTTP Questions