And where did I inherit ...?

[Ivan Glinkin]

As already reliably known, both the words of Assange and the Wikileaks publications only confirm this, everything that gets on the Internet remains there forever. Forever and ever. FOREVER AND EVER.
Under any conditions and circumstances.
If you think you deleted a photo from a social network, then no one will ever see it? This is a great fallacy. If after clicking on the delete button you don’t see the photo, this does not mean that it has sunk into oblivion.
You can do a simple experiment. Go to your page on VKontakte and try to delete any comment, photo or post on the wall. Made? Fine. What did the site offer you after removal? Restore.

"WHAT? RESTORE? AM I DELETED? ” - you will exclaim.

When you click on the corresponding button, all information is restored.
But this is only the visible side, so to speak, the tip of the iceberg, or rather one thousandth of the peak ...

But the conversation is not about that. The subject of this article is to help you figure out what information you leave on the Internet without even realizing it.
Today we’ll talk about HTTP headers.
What it is? HTTP headers are used to “communicate” the browser and the web server. Of the variety of headings, we will be most interested in the following:

* REFERER - if you go from one page to another, the referer will contain the address of the first page. Often software is installed on the server that analyzes the referer and extracts various information from it. This can be useful, for example, when you need to know backlinks when analyzing the effectiveness of network advertising. Environment variable: HTTP_REFERER.
Example: if you went to our site via Google, then REFERER will contain the following line - https://www.google.ru . If you have direct access, that is, you typed the site address in the address bar, then the specified header will be empty.

* USER-AGENT - when visiting a website, the user's browser sends information about themselves to the web server, which usually includes: the name and version of the browser, as well as the computer’s operating system. Environment variable: HTTP_USER_AGENT.
Example: if you use the Firefox browser and you have the Windows7 operating system installed, then USER-AGENT will contain the following line - Mozilla / 5.0 (Windows NT 6.1; WOW64; rv: 40.0) Gecko / 20100101 Firefox / 40.0
The peculiarity is that Windows7 shows itself as “Windows NT 6.1”, Windows8 as “Windows NT 6.2”, etc.
And the Opera browser encrypts itself with almost all known browsers - Mozilla / 5.0 (Windows NT 6.1; WOW64) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 44.0.2403.155 Safari / 537.36 OPR / 31.0.1889.174.

* X-FORWARDED-FOR - the path of your request to the site can go through a chain of proxy servers before it reaches the destination. The X-Forwarded-For header may contain a list of the IP addresses of the servers in this chain, separated by semicolons. Usually, in the absence of a proxy server, X-FORWARDED-FOR matches your IP.
Environment variable: HTTP_X_FORWARDED_FOR.
Example: 172.164.80.34; 8.6.34.224
To evaluate the performance of X-FORWARDED-FOR, try accessing the indicated page through the Opera browser with the Turbo mode turned on. Your real IP address will be shown in this variable, and the proxy server address will be shown in REMOTE_ADDR, which you can read about below.

Together with the specified headers, I want to talk about another environment variable - REMOTE_ADDR.
REMOTE_ADDR - contains the final IP address of the user from which the latter is viewing the page. If a proxy server is used, then the proxy server address is specified in REMOTE_ADDR.
Example: 93.158.178.188

Now, the fun part is: interactive. Take a look at the information below. This is the data that You transmit when visiting sites :

Unfortunately, this forum does not allow you to embed active php scripts. You can see the interactive version with the executable script on the Department’s website

Yes, yes, this is exactly your IP address, exactly your operating system and browser, and exactly the page from which you got here.
PS Be careful =)

Thank you for your attention, best wishes and see you soon.
Regards, Department

 

[Матушкин Андрей Николаевич]

THANK.

 

[Москва Детектив]

As far as I understand, information is almost impossible to delete?

 

[Плотников Юрий Михайлович]

Thank!

 

[STALKER]

Thanks, informative!

 

[Ivan Glinkin]

Thanks everyone for the feedback! Very nice.

As far as I understand, information is almost impossible to delete?

Partly yes. In addition, search engines (Yandex, Google, etc.) cache information (read: store on their server). Therefore, even if you deleted something from your website / blog / page, but this has already been saved by the search engine, then for at least six months it will still be publicly visible =))

Regarding HTTP headers. These headers are stored in your browser and it is he who forms them. Regarding search spiders, as well as other information parsers, the user agent is formed by the programmer.
Therefore, user agent data, as well as other HTTP headers, can be hidden.
For example: site https://www.4proxy.de allows you to replace your real IP, as well as hide the referrer. However, it leaves data about the browser and operating system.

I can create a similar service, hiding the IP address, user agent and other things, but I'm not sure that it will be in demand taking into account existing resources and the TOP browser.

Respectfully,
Ivan

 

[Чередов Алексей]

Thank!

 

[Александра]

Thank. Interestingly, I will take note.

 

[КОНРАД]

It is necessary to correctly delete all information from the computer, I recommend the program "Eraser" the method of cleansing the information is selected, then definitely no one will restore it.

But VKontakte is quite accessible to a simple layman to restore his own census or information from the wall, photos, etc. after at least a month.

 

[Ivan Glinkin]

It is necessary to correctly delete all information from the computer, I recommend the program "Eraser" the method of cleansing the information is selected, then definitely no one will restore it.

But VKontakte is quite accessible to a simple layman to restore his own census or information from the wall, photos, etc. after at least a month.

Thanks for the addition, colleague)