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title Network & HTTP Homework

Network & HTTP Homework

Advanced homework

  1. Explain, how domain frontend-materials.cursor.education is showing the same content, as on https://github.com/cursor-education/frontend-materials/.
  2. Using www.postman-echo.com play with Cookies
    • expected results: http packagies with request/response
  3. Using www.postman-echo.com and telnet (or any extension for manual http request built & send) play with Digest Auth
    • expected results: http packagies with request/response
  4. Read about Session Cookies
    • expected results: why do we need them? where they're stored? describe the idea.
  5. Find multiple CDNs, and using TraceRoute, Ping and other commands - analyze and compare them
    • expected results: any differents between choosen CDNs
  6. Play with Fiddler
    • try to sniff the HTTPS requests
    • expected results: any screenshots with tool functionality

Simple homework

  1. Play with Chrome Developers Toolkit (DevTools), and "Network" tab
    • choose at least 5 websites (any)
    • open each of them one by one
    • view & analyze list of requests & responses (that your browser made)
      • analyze the GET request/response packagies (the homework should include the whole package text including request-line and headers)
      • explain each of headers line (what "User-Agent" means? what "Accept" means? what does other means?)
    • Expected result
      • the list of websites, with request and response (including the status-line & headers) of each of them
      • the list of headers (from above requests/responses) with descriptions of each (you need to google & find the purpose of each)
  2. What are differences between HTTP version 1.0 and 1.1?
    • navigate your browser to websites what you're frequently use (the company's website, some social networks, etc)
    • Expected result
      • list of differences between 1.0 and 1.1
      • answer to question - how to pass user-data via GET? via POST? what is the diff?
      • few samples of websites (and cases) where POST method is used
  3. Use actions on "Network" tab
    • try to use a "search" & "filter" fields/actions
    • use ordering by columns, sorting, etc
    • Result: describe what feature have you used, and how you can use it in future
  4. Using the Postman
    • create a GET request to any website
    • analyze the response
    • Expected result
      • the HTTP request & response (including request-line / status-line & headers)
      • description of each header line on response
  5. Using the Postman
    • the same as above task, but you need to create the "HEAD" requests
    • what is the different with GET request?
    • Expected result
      • the HTTP request & response (including request-line / status-line & headers)
      • the answer to question about differences between HEAD and GET methods
  6. Find and show few (at least 5) resources, where POST method is used
    • list the URLs of resources
    • explain how did you detect that POST method was used?
    • what response was returned after request has been sent?
    • Expected result
      • list with websites & description where POST is used there
      • answer to question why the POST is used there
  7. Using the Postman extension
    • set it up, if not installed yet
    • send 5 any requests (including HEAD, GET & POST) to any website
    • Expected result
      • screenshot with request & response from Postman
  8. Find any free hosting that provides FTP access
    • google "ftp free hosting", or "free hosting", etc
    • proceed registration, confirmation & get your ftp access credentials (host/port, login, password)
    • using any ftp client, deploy any static files (html, any images, etc)
    • provide an url (http link) that navigates to uploaded file
    • Expected result
      • direct url into uploaded file

The homework should be uploaded to Google Docs (enable sharing to everyone, make the document public).

Hometask notes

  1. The correct (!) example of HTTP request & response (below listed example for http://google.ua/)

    • request:
    GET / HTTP/1.1
Host: google.ua (імя домену)
Connection: keep-alive
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36 
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8,uk;q=0.6,uk;q=0.4
    • response
    HTTP/1.1 302 Found
Server: nginx
Date: Fri, 18 Mar 2016 15:20:04 GMT
Content-Length: 0
Connection: keep-alive
Cache-Control: no-cache,no-store,max-age=0,must-revalidate
Location: https://google.ua/
Expires: Fri, 18 Mar 2016 15:20:04 GMT
Last-Modified: Fri, 18 Mar 2016 15:20:04 GMT
P3P: policyref="/w3c/p3p.xml", CP="NON DSP ADM DEV PSD IVDo OUR IND STP PHY PRE NAV UNI"

  2. Example of POST request

    • the http://pastebin.com/
    • put anything to "New Paste", and click on "Submit" button
    • the POST method will be sent to http://pastebin.com/post.php
    • server respond with "302 Moved Temporarily", and will redirect to another url
    • where the pasted text is located (for instance, "location: /w8jzrkBF").