Cookie Examples - Web Development Udacity English English (auto-generated)

Cookie Examples - Web DevelopmentYouTube↗ IA↗(long shot)
Education 5.4K views 29 likes 2 dislikes 23 Feb 2015

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Okay, let's do a quick demo, remember when we played around

okay let's do a quick demo remember we

on Telnet in Unit One to, to manipulate Web servers directly? I'm

played around when telnet in unit 1 - to manipulate web service directly I'm

going to go ahead and do that here, and we can look

gonna go ahead and do that here and we

at some more HTTP headers. So, if I were to Telnet to

can look at some more HTTP headers so if

google.com, you know, port 80, as we've been doing. So, we

I were to tell that to Google comm you know port 80 as we've been doing so we

do our HTTP request to get the front page remember our host

do our HTTP requests to get the front page remember our host header we see our

header. We see our results, we scroll up to the top of

results we scroll up to the top of this

this, we can our our header. So here's the request I made,

we can see our our header so here's the

and here are the headers and here are a couple set cookie

request I made and here are the headers and here are a couple set cookie header

headers. So in this one, this sets a cookie named pref, to

so on this one this sets a cookie named pref to this value and it's actually

this value and it's actually Google's doing a very typical Google thing,

google's doing a very typical google

and storing multiple pieces of data in one cookie. So this is

thing and storing multiple pieces of data in one cookie so this is the equal

the equal sign that's part of the cookie header, and this equal

sign that's part of the cookie header

sign is actually part of the cookie value. This is the end

and this equal sign is actually part of

of the cookie value here, we've got a semicolon and then we

the cookie value this is the end of the cookie value here we've got a semicolon

have some extra parameters that we haven't talked about yet. We have

and then we have some extra parameters that we haven't talked about yet we have

an expires time, and this is when the cookie expires. So after this date, April

an expires time and this is when the cookie expires so after the state April

19th, 2014, this cookie will no longer be

19 2014 this cookie will no longer be

sent and this cookie is relative or relevant

sent and this cookie is relative or

to the path slash so you can restrict cookies to specific paths and this cookie

relevant to the path slash so you can restrict cookies to specific paths and

is specific to google.com. So this basically means

this cookie is specific to google.com and so this basically means that you

that anybody at google.com will receive this cookie.

know anybody on google.com will receive

Here is a, another, another cookie this one's called NID. And

this cookie here is a another another

you know, you can see the value comes all the way

cookie this one's called n ID and you know you can see the value comes all the

down here, to the first semicolon. Expires time of its own a path, a domain, some extra constraints. This cookie's only and relevant

way down here till 4 semicolon expires time of its own a path a domain um some extra constraints this cookies only and

to http which, which, is, is just another, another cookie Option

relevant to HTTP which which is just

you have at your disposal. I want to show you one quick thing

another another cookie option you have at your disposal I wanna show you one

while we're in the terminal here. If you're on a Mac

quick thing while we're in the terminal

or Linux you can use the Curl Cmd which is pretty cool.

here if you're on Mac or Linux you can

Say, curl -I, which basically says, get me the headers.

use the curl command which is pretty cool say curl - I which basically says get me

curl -I google.com, and that'll just run the headers. I'm

the headers curl - I google comm and that'll just run the headers I'm not

not going to quiz you on that, but if you're on

gonna quiz you on that but if you're on

a Unix machine, you can use Curl instead of Telnet, and

a UNIX machine you can use curl instead

you don't have to type so fast and type so

of Telma and you don't have to you know

much stuff. So anyway, curl -I, handy little tool for

type so fast and type so much stuff so anyway curl - I handle all tool for for

viewing HTTP headers. I'll show you one last way to

viewing HTTP headers I'll show you one

inspect cookies this may not work for everybody, but it's another

last way to inspect cookies this may not work for everybody but it's it's another

neat experiment. Your on in Chrome I'm in you know special

neat experiment Here I am in Chrome I'm in a you know a

private browsing mode which is what all this is talking about. Basically

special private browsing mode which is what all this is talking about basically

I'm in the Private browsing mode because I'd, I don't want to have

I'm in the private browsing mode because

any cookies, and that's generally what this Private browsing modes do, is

I don't want to have any cookies and that's generally what these private

they throw away all your cookies. So I'm going to, I'm going to

browsing modes do is they throw away all your cookies so I'm gonna I'm gonna do

do something here, I've open up to the Bug tools in Chrome,

something here I've opened up the debug

this are in Developer tools that are built in the Chrome, you

tools in Chrome these are some developer

can Google around for, how to show this in Chrome or you

tools that are built in the chrome you can google around for how to show these

know Safari and Internet Explorer also have, a similar feature so

in chrome or you know Safari and Internet Explorer also have a similar

you can kind of watch requests. And I'm going to go to google.com

feature so you can kind of watch requests and I'm going to go to

and on here I can see all of the requests we

google.com and down here I can see all

made at google.com and one thing I can do is I can

the requests we made at google.com and one thing I can do is I can actually

actually view the headers. We can actually view the request header

view the headers we can actually view

I made for Google.com and you can see we, we sent some

the request header I made for google.com and you can see we sent some various

various headers. We didn't send any cookies, cause we don't have any.

headers we didn't send any cookies

And if we scroll down a little bit, we can see you

because we don't have any and if we scroll down a little bit we can see you

know one of the cookies that got set, right here. This

know one of the cookies that got set

is one of the cookie headers, so that cookie. If we

right here this is one of the cookie

were to reload this page now, our browser, Chrome here, has

headers set cookie if we were to reload this page now our browser chrome here

stored this cookie. If we were to load this page, we should

has stored this cookie if we were to reload this page we should see a new

see a new request header, I will do that now. I

request header so I'll do that now I've

have reloaded the page and now we see the request we made

reloaded the page and now we can see the

for the google.com the request has a cookie header and this

request we made for the two google.com the request has a cookie header and this

says the exact same context as the sec cookie. Well at least

has the exact same contents as the set

the name here, and the value is the

cookie or at least the name here and the

same. You don't have to resend Path and Domain

value are the same you don't have to

and all those other Options, those are just

resend path and domain and all those

for the browser to know when to send the

other options those are just for the browser to know when to send the cookie

cookie. If, if, if you're feeling adventurous, you

if you're feeling adventurous you can

can find a, a Debug mode in your browser

find a debug mode in your browser and

and experiment with this sort of stuff. It's kind

experiment this sort of stuff it's kind

of, it's kind of neat to see what's there.

of it's kind of neat to see what's there

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