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Table of contents
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Table of contents

0:00
Вступление
1:02
Начало истории: С чего начался интернет?
1:58
HTTP
4:13
Рекламная пауза
5:51
Появление цифровых кодов
8:56
Ошибки и коды на цифру 5
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android
iPhone
droider
Борис веденский
Валерий истишев
Митя Иванов
internet
error
error 404
404
ошибка 404
ошибка
интернет
разбор
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  • ruRussian
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00:00:00
You've probably often seen this in your browser.
00:00:02
But what is a 404 error and what do
00:00:05
these numbers mean? It would seem not the most
00:00:08
difficult question. You can just Google it
00:00:11
and Hmm, well, it looks like everything is not so obvious
00:00:14
and you'll have to dig deeper. So
00:00:16
today we'll figure it out and find out what the
00:00:18
code 404 means. What other important codes are there and
00:00:22
where did all this come from? This
00:00:24
droider is with you Boris of Siena will be
00:00:26
interesting
00:00:28
Let's go
00:00:30
[music]
00:00:32
Why do we have five fingers why do
00:00:34
people need an alpha male and Why, from the point of
00:00:36
view of evolution, breasts are not
00:00:39
sexy at all about this and not only are we talking with
00:00:41
anthropologists channel the basis Look at the
00:00:44
link in the description then we’ll talk about
00:00:46
women’s breasts Well, this is Beauty You can
00:00:49
immediately see the product with its face, how the work is made by
00:00:52
us by man Why did clothes appear and
00:00:54
what is love from the point of view of biology
00:00:56
subscribe to the basis, click like and
00:00:58
support the bell project link in
00:01:03
the description our story begins in the
00:01:05
eighty-ninth year at the European
00:01:07
Center for Nuclear Research or simply
00:01:09
CERN, it was there that Tim nsley proposed
00:01:12
creating a worldwide computer network on
00:01:14
this network documents should be published
00:01:15
linked to each other
00:01:17
using links, that is, hypertext
00:01:20
documents, and that’s how the worldwide one appeared
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Putin or the World Wide Web system for
00:01:25
accessing documents located on
00:01:26
computers that are connected to the
00:01:28
Internet, wait But isn’t the web and the
00:01:31
Internet the same thing? M not
00:01:33
exactly the Internet is a network that connects
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devices around the world, and the web is the same
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how do these same
00:01:41
devices exchange and to standardize the exchange of
00:01:43
information between computers, the
00:01:45
http hypertext transfer protocol was invented;
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we won’t delve too deeply into the mechanism of operation of this protocol;
00:01:51
this is perhaps a topic for a separate
00:01:52
video by the way. Write in the comments
00:01:53
If you want one and click like
00:01:55
subscribe the bell if you
00:01:58
need it http it is important for us to know one thing,
00:02:01
the basis of its work is the
00:02:03
interaction between the client and the server. That is,
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we have a client or user
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who sends a request for some
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information to the server and he, in turn,
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performs the necessary actions and
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returns messages with the result, and in the
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usual case the client - this is the
00:02:18
user’s browser and the message with the result
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is the page that will open there. But
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what is all this for? Let’s figure out how exactly
00:02:24
the clients and server exchange information,
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what is important here is the client request - This is a
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text message consisting of three
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parts, the first part is the Start line, the
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type of request is formed in it the most widely
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used type is called Get, it
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requests server data; the second part is the
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message header; it stores the address of
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the site to which the request is sent and
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information such as the browser version,
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language settings and some others; the
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third part of the message is optional and, for
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example, it can contain data
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for uploading to the server For example, this is what a
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request to our site looks like to
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receive a page with the main
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materials for the week. So after
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receiving the request, the server processes
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it and sends its response to the client, this is what it
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might look like. The answer is more complicated and
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then the page itself is transmitted, but
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here we are interested in the first line of the
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http 1.1 response - this is the version of the protocol
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that is used by the server, there are
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also versions 2T, they are not used
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everywhere, then the next number is 200 and
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the message Okay and this is where
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the fun begins 2 - this is the so-called
00:03:24
http status code It allows you to convey the
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connection status with just a few
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digits, but why was this necessary? This was a
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very important part of the message when
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the Internet was just beginning, it was not
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as reliable And as fast as it is now, it
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was not always possible to
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load a separate page with
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information about errors because there
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was not enough channel And a three-digit code made it possible
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to report in the most concise way that something is
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not working so Or, on the contrary, that everything is in
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order so that you understand how
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critical this function is, in front of you is a graph of the
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average Internet speed from the moment of its
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inception, now we are with you. About
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here, about 100 Mbps per
00:03:56
second, but http was developed at a
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time when the average speed was more
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than 1,000 times less to be precise
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14.5 KB per second but for example the average
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size of a web page now is 3 MB
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then such a page would load
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for
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half an hour but the problem with the old Internet
00:04:17
was not only speed but also
00:04:19
quality in the nineties, it
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was possible to connect to the network only via a telephone
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wire, which means that such an
00:04:24
Internet connection was subject to the same
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problems as regular telephone communications,
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that is, interference and interruptions, the connection was
00:04:30
extremely unstable and could be interrupted at
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any moment. That is why a short code
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of three digits could be transmitted literally
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instantly even with such a connection, and
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thanks to this, both the client and the server could
00:04:39
quickly discover on whose side
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the problem is even without loading the full
00:04:42
page, but what codes were
00:04:44
invented then? In general, there are five categories
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of codes that are determined by the first digit
00:04:48
and the other two are just ordinal
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number in general they say that this number is
00:04:52
literally in what order this or
00:04:53
that possible situation came to the
00:04:55
engineers’ minds when creating and filling out the
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standard codes starting with this so-
00:05:00
called informational responses there are
00:05:02
only four of them and they mean the
00:05:03
need to wait for a response from the server
00:05:05
and in no way are displayed on the client with
00:05:08
the number two; messages about a
00:05:09
successful connection begin; the main code here is
00:05:12
already mentioned 2, meaning that the
00:05:14
client’s request was completed successfully; codes for a
00:05:16
beginning construction project - this is a message about the
00:05:18
need to redirect the request;
00:05:20
for example, code 301 means that the
00:05:23
requested resource has been moved to a new
00:05:25
address, which is sent along with
00:05:27
this code Well, such a redirect And what’s most
00:05:30
interesting is that you’ve most likely never encountered codes from one to three
00:05:33
because they are intended for the
00:05:35
browser and not for the user, but
00:05:39
you’ve probably seen codes starting with four and five. Why Yes, because
00:05:41
they indicate errors codes 400 - these are
00:05:44
errors on the client side And 5:00 on the
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server side, that is, they occur
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if the client’s request for some reason
00:05:51
can be regarded as incorrect.
00:05:53
For example, if we Request something that is not on
00:05:55
our website, we will receive the well-known
00:05:57
message 40 04 not found not found on
00:06:02
we don’t have this 404 is the most famous of
00:06:04
all response codes. Each of us
00:06:06
has encountered it at least once. It means that the
00:06:08
server could not find the page that
00:06:10
the browser requested, sometimes instead of 404,
00:06:12
403 forbidden is displayed. This means
00:06:16
that access to the requested resource
00:06:17
is denied, perhaps the most unusual
00:06:19
response code from all 418 I A TP That is, I'm a
00:06:24
teapot According to the official documentation,
00:06:26
this code means that the server refused to
00:06:28
make coffee to the client due to the fact
00:06:30
that the server is a teapot,
00:06:33
programmers joke in general, this is an
00:06:34
April Fool's joke invented in
00:06:36
ninety-eight, but now this
00:06:38
code can be actively used For example,
00:06:40
if such requests there are too many other things you
00:06:42
might have encountered with error 429, it
00:06:44
also means that too many
00:06:46
requests have arrived, this is protection against
00:06:47
service overload from DDoS, but sometimes it can
00:06:50
also work if
00:06:52
the page is reloaded frequently, and in 2015 it was approved
00:06:55
Another new interesting code 451 is not available
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for legal reasons reasons This means that
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access to the resource is closed, for example, due to the
00:07:02
requirements of government
00:07:03
authorities or the copyright holder in case of
00:07:05
copyright infringement, and this
00:07:07
combination was chosen for a reason; scholars
00:07:09
can pause and think, and the
00:07:11
fact is that this is a reference to
00:07:12
Ray Bradbury’s dystopian novel Fahrenheit 451°
00:07:14
the plot of which kings
00:07:17
are burned for censorship purposes.
00:07:20
But what’s wrong with the codes starting with the number p,
00:07:23
it turns out that the last category of responses
00:07:25
http is also very interesting, these codes
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starting with a five mean an error
00:07:30
on the server’s side. The most
00:07:31
common 503 and 504, the first
00:07:34
means that the server is unavailable for some reason
00:07:36
or maintenance
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or too much load; the second
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occurs when there
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is an intermediate gateway server between the client and the server
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and this gateway cannot receive a response from the
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server; there is another error 502,
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it means that the server received an
00:07:51
incorrect response, so the page
00:07:52
cannot be loaded; there are
00:07:54
more than 6 similar codes but
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only 16 are actively used and in general the http protocol is very
00:07:58
actively developing. Despite the fact that it is
00:08:00
already more than 30 years old, in fact,
00:08:03
browsers began to support the third version of http
00:08:05
only a couple of years ago, but
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almost no new codes have appeared recently, what is the
00:08:10
reason because new technologies must
00:08:11
generate new errors and new codes
00:08:14
for them. The answer is simple since the creation of
00:08:15
http. The World Wide Web has become much
00:08:18
faster and more reliable interactively;
00:08:20
there is no longer any need to
00:08:22
convey the status of messages and errors as concisely as possible,
00:08:24
because now it will not be difficult
00:08:26
to load an entire page describing
00:08:27
any problem and options for
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solving it, in particular, therefore it is not
00:08:31
used, for example, code 402, which
00:08:33
was intended for the status of
00:08:35
online payments. Why bother with
00:08:37
codes if you can simply create a
00:08:38
page with the payment status and show
00:08:40
it to the user such things I hope it was
00:08:42
informative and useful Write in the
00:08:44
comments What other topics are related
00:08:46
Internet and its device would you like
00:08:48
us to cover on the Droider channel and
00:08:50
Subscribe, press the bell like,
00:08:52
don’t miss other videos And
00:08:53
Boris Vedensky was with you See you in the
00:08:58
future I

Description:

ОСНОВА с антропологом Еленой Судариковой: https://www.youtube.com/watch?v=0Li-xxi9uR8 🤟Мы в телеграм) https://telegram.me/droidergram Что такое ошибка 404 и что значит этот числовой код? Причем тут интернет и HTTP-протокол передачи данных? Какие еще бывают коды в интернете и что они означают? И причем тут чайник? Подписка! ↓ ↓ ↓ https://www.youtube.com/channel/UCY03gpyR__MuJtBpoSyIGnw?sub_confirmation=1 СОДЕРЖАНИЕ: 00:00 Вступление 01:02 Начало истории: С чего начался интернет? 01:58 HTTP 04:13 Рекламная пауза 05:51 Появление цифровых кодов 08:56 Ошибки и коды на цифру 5 10:18 Спасибо, что посмотрели 🎧 Наш ПОДКАСТ Droidercast: Apple Podcasts: https://podcasts.apple.com/ru/podcast/droidercast/id1057019371?l=en Podster: https://podster.fm/podcasts/droidercast Еще видео и обзоры на: https://droider.ru/ http://VK.com/Droider_ru http://Twitter.com/Droider_ru С вами на связи Борис Веденский и Валерий Истишев! Обзоры смартфонов, репортажи с выставок, новости из мира технологий и многое другое на самом популярном в Рунете канале о гаджетах Droider.Ru!

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