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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

User Agent Library

author
Elaine Sutton
• Tuesday, 27 October, 2020
• 7 min read

A new version of the package is automatically released every day, so the data is always up to date. Web scraping often involves creating realistic traffic patterns, and doing so generally requires a good source of data.

(Source: www.youtube.com)

Contents

Unlike other random user agent generation libraries, the User -Agents package is updated automatically on a daily basis. Generating a realistic random user agent is as simple as running new Sergeant(), but you can also easily generate user agents which correspond to a specific platform, device category, or even operating system version.

The fastest way to get started is to hop down to the Examples section where you can see it in action! You can install it using your favorite JavaScript package manager in the usual way.

These examples illustrate some common use cases, and show how the filtering API can be used in practice. The data property includes a randomly generated browser fingerprint that can be used for more detailed emulation.

By passing an object as a filter, each corresponding user agent property will be restricted based on its values. If you replace mobile with either desktop or tablet, then the user agent will correspond to one of those device types instead.

This example combines a regular expression filter with an object filter to generate an user agent with a connection type of Wi-Fi, a platform of Mac Intel, and an user agent that includes a Safari substring. This example also shows that you can specify both multiple and nested properties on object filters.

agent user ip failed crawls fix website deepcrawl address blocked
(Source: www.deepcrawl.com)

Each time the class is instantiated, it will randomly populate the instance with a new user agent based on the specified filters. The following examples both generate two user agents based on the same filters.

The reason to prefer the second pattern is that it reuses the filter processing and preparation of the data for random selection. Subsequent random generations can easily be over 100x faster than the initial construction.

It's likely that the structure of user agent data will change in the future, and this will correspond to a new major version. You can continue to use older versions of the software, but you'll need to upgrade to get access to the latest data.

Additional data sources will help make the library more useful, and we'll be happy to add a link to your site in the acknowledgments. The debug information isn’t showing the headers being sent during the request.

If you’re using requests v2.13 and newer The simplest way to do what you want is to create a dictionary and specify your headers directly, like so: If you’re using requests v2.12.x and older versions of requests clobbered default headers, so you’d want to do the following to preserve default headers and then add your own to them.

(Source: osipenkov.ru)

It’s more convenient to use a session, this way you don’t have to remember to set headers each time: The Sergeant Class provides functions that help identify information about the browser, mobile device, or robot visiting your site.

The string “Safari” in this example is an array key in the list of browser definitions. You can find this list in app/Config/UserAgents.php if you want to add new browsers or change the strings.

Returns:TRUE if the user agent is a (specified) mobile device, FALSE if not If you find that some bots that commonly visit your site are missing from the list you can add them to your app/Config/UserAgents.php file.

GetVersion () Returns:Detected browser version or an empty stringReturn type:stringReturns a string containing the version number of the web browser viewing your site. GetMobile () Returns:Detected mobile device brand or an empty stringReturn type:stringReturns a string containing the name of the mobile device viewing your site.

Built with Sphinx using a theme provided by Read the Docs. User _agents is a Python library that provides an easy way to identify/detect devices like mobile phones, tablets and their capabilities by parsing (browser/HTTP) user agent strings.

switcher agent user chrome webnots
(Source: www.webnots.com)

User _agents relies on the excellent parser to do the actual parsing of the raw user agent string. Alternatively, you can also get the latest source code from GitHub and install it manually.

Various basic information that can help you identify visitors can be accessed browser, device and OS attributes. As for now, these attributes should correctly identify popular platforms/devices, pull requests to support smaller ones are always welcome.

Fixed errors when running against newer versions if parser Support for Python 3 Sergeant strings come in all shapes and sizes, and the number of unique user agents is growing all the time.

If you need to integrate the user agent parser directly into your website or system then it's very simple to use the API. This will let you do things like advanced filtering and searching, identify trends in user agents, perform statistical analysis and other interesting applications.

The Sergeant Class provides functions that help identify information about the browser, mobile device, or robot visiting your site. When the Sergeant class is initialized it will attempt to determine whether the user agent browsing your site is a web browser, a mobile device, or a robot.

(Source: osipenkov.ru)

The string “Safari” in this example is an array key in the list of browser definitions. You can find this list in application/config/ user _agents.php if you want to add new browsers or change the stings.

Returns:TRUE if the user agent is a (specified) mobile device, FALSE if not If you find that some bots that commonly visit your site are missing from the list you can add them to your application/config/ user _agents.php file.

Return type:Lets you determine if the user agent accepts a particular language. This method is not typically very reliable since some browsers do not provide language info, and even among those that do, it is not always accurate.

Return type:Lets you determine if the user agent accepts a particular character set. This method is not typically very reliable since some browsers do not provide character-set info, and even among those that do, it is not always accurate.

Built with Sphinx using a theme provided by Read the Docs. Look around to find user agents for whatever browser, operating system, device, software type or layout engine you need.

(Source: my-master.net.ua)

With version 0.3 the baseline has been updated to java 11 and spring boot 2.1 and the underlying user agent parser library has been replaced with a more recent project. Making statements based on opinion; back them up with references or personal experience.

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Sources
1 www.bettertechtips.com - https://www.bettertechtips.com/how-to/change-user-agent-microsoft-edge/
2 news.softpedia.com - https://news.softpedia.com/news/how-to-change-the-user-agent-in-the-chromium-microsoft-edge-525516.shtml
3 browsernative.com - https://browsernative.com/user-agent-chrome-extension/
4 helpdeskgeek.com - https://helpdeskgeek.com/how-to/how-to-change-your-browsers-user-agent-without-installing-an-extension/
5 answers.microsoft.com - https://answers.microsoft.com/en-us/insider/forum/insider_internet-insider_spartan-insiderplat_pc/how-to-change-microsoft-user-agent-to-microsoft/717c45a0-e375-4cc2-9d9c-a314b2fd6ad7
6 www.howtogeek.com - https://www.howtogeek.com/113439/how-to-change-your-browsers-user-agent-without-installing-any-extensions/