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What Does Your User Agent Say About You?

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A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".

(Source: Mozilla.org)

User Agent String

Browser Data

Parse User Agent Javascript

author
Earl Hamilton
• Friday, 30 July, 2021
• 9 min read

I need to extract the Operating System's name and the browser's name from the user agent string. I just need to extract the OS name and the browser name with their respective versions.

json parse javascript
(Source: appdividend.com)

Contents

Those days are behind us though, but one of the web's dirty secrets is that the user agent still has many uses. I recently found Tobit Angel's parser, a great repo which provides simple UA parsing in JavaScript, PHP, and Python.

The code samples above are all easily recognizable by those who can use them; using user agent information is simple, and the API is as well. Now that CSS gradients are supported in Internet Explorer 8+, Firefox, Safari, and Chrome...

Ip provider city lat Lon country country_code region region_code timezone zip platform browser resolution engine processor mobile robot date referring User agent allows you to parseuseragent strings with high performance and accuracy by using regular expressions for browser matching.

This is why regular user agent parsers have major issues because they will most likely parse out the wrong browser name or confuse the render engine version with the actual version of the browser. The module has been developed with a benchmark driven approach.

This module relies on uap-core's regexes.yaml user agent database to parseuseragent strings. Installation is done using the Node Package Manager (NPM).

parsing defer devteamalpha javascript
(Source: devteamalpha.com)

This will asynchronous load the database from the server and compile it to a proper JavaScript supported format. If it fails to compile or load it from the remote location it will just fall back silently to the shipped version.

If you want to use this feature you need to add yamlparser and request to your package.Jason The first argument should the user agent string that is known on the server from the req.headers.user agent header.

This allows you to detect if the user is browsing the web using the Chrome Frame extension. The parser returns an Agent instance, this allows you to output user agent information in different predefined formats.

The parse method returns an Agent instance which contains all details about the user agent. This can be handy if you expect to parse a lot of user agent strings.

Useragent.is(user agent string).browser name; This API provides you with a quick and dirty browser lookup. The underlying code is usually found on client side scripts so it's not the same quality as our user agent.

(Source: www.youtube.com)

The Agent exposes the parsed out information from the user agent strings. This allows us to extend the agent with more methods that do not necessarily need to be in the core agent instance, allowing us to expose a plugin interface for third party developers and at the same time create a uniform interface for all versioning.

Major The major version number of the family, it defaults to 0. Minor The minor version number of the family, it defaults to 0. Patch The patch version number of the family, it defaults to 0. When you access those 2 properties the agent will do on demand parsing of the Operating System or/and Device information.

Agent.agent(); Returns the family and version number concatenated in a nice human-readable string. Agent.version(); Returns the version of the browser in a human-readable string.

Fork and clone this repository Make some changes as required Write a unit test to showcase your feature Run the test suites to make sure the changes you made didn't break anything $ NPM run test Commit and push to your own repository Submit a pull request to this repository under develop branch Profit? THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND Infringement.

IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Look around to find user agents for whatever browser, operating system, device, software type or layout engine you need.

json parse javascript ssh raspberry pi sifre putty login kurulumu raspbian ve
(Source: appdividend.com)

Most fields using product tokens also allow sub-products which form a significant part of the application to be listed, separated by white space. The tokens are typically listed by significance, however this is completely left up to software publisher.

In summary, it is not a very standardized format, and as we will see, has evolved into a fairly chaotic environment that can be only unraveled by sustained and dedicated attention to mapping and interpreting this entropy. One of the main use cases of an user agent parser is to identify and handle requests from certain types of traffic.

This is particularly useful when dealing with the wide spectrum of devices in use today, and allows you to get as fine-grained as you like with your content targeting strategy. Outside of web optimization, this has obvious applications to the advertising sector, where the device can be useful as a criterion for targeting.

Bots and crawlers have User -Agents too, and can be identified accurately by a good device detection solution. Security is the other big area where being aware of the nature of traffic hitting your services is extremely important.

These range from search engines to link checkers, SEO tools, feed readers, scripts and other nefarious actors at large in the web landscape. Being able to distinguish between these different sources can provide significant savings in IT costs by detecting and identifying bot traffic to your site.

(Source: www.youtube.com)

You would need to constantly update your regex rules as new devices, browsers and OSs are released, and then run tests to see if the solution still works well. At some point, this becomes a costly maintenance job, and, over time, a real risk that you are misdirecting or failing to detect much of your traffic. Accurately parsing User -Agents is one problem.

Device Atlas uses a Patricia train data structure to determine the properties of a device in the quickest and most efficient way. This is the reason why major companies rely on established solutions built on proven and patented technology like Device Atlas.

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Sources
1 winaero.com - https://winaero.com/change-the-user-agent-in-internet-explorer-11/
2 www.howtogeek.com - https://www.howtogeek.com/113439/how-to-change-your-browsers-user-agent-without-installing-any-extensions/
3 websistent.com - https://websistent.com/internet-explorer-change-user-agent/
4 helpdeskgeek.com - https://helpdeskgeek.com/how-to/how-to-change-your-browsers-user-agent-without-installing-an-extension/
5 www.tenforums.com - https://www.tenforums.com/browsers-email/150941-changing-user-agent-internet-explorer-11-a.html
6 www.howtogeek.com - https://www.howtogeek.com/howto/18450/change-the-user-agent-string-in-internet-explorer-8/
7 answers.microsoft.com - https://answers.microsoft.com/en-us/ie/forum/ie11-iewindows_10/set-default-user-agent-string-for-ie-11-without/daab73a4-4c6c-4c5b-9cb7-abf081494637
8 www.maketecheasier.com - https://www.maketecheasier.com/change-user-agents-chrome-firefox-edge/
9 www.windows-security.org - https://www.windows-security.org/baf5dd1a92b7a288d70d4dcbce54e54d/customize-user-agent-string