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.
A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".
Cheshire is designed to make it easy for users to read and write email, surf the web, listen to AOL Radio and dial up to the Internet. Cheshire includes AOL's Parental Controls and works with Apple's built-in applications like chat and photo.
Click on any string to get more details Chimera 0.6 Free open-source web browser developed by Google. Chromium is the name of the open source project behind Google Chrome, released under the BSD license.
Kapok 3.0 Kazehakase is a web browser for UNIX compatible environment that is implemented with multiple layout engines. Elite 1.1.2 Click on any string to get more details Conqueror 4.9Konqueror 4.5Konqueror 4.4Konqueror 4.3Konqueror 4.2Konqueror 4.1Konqueror 4.0Konqueror 3.5Konqueror 3.4Konqueror 3.3Konqueror 3.2Konqueror 3.1-rc6Konqueror 3.1-rc5Konqueror 3.1-rc4Konqueror 3.1-rc3Konqueror 3.1-rc2Konqueror 3.1-rc1Konqueror 3.1Konqueror 3.0.0-10Konqueror 3.0.0Konqueror 3.0-rc6Konqueror 3.0-rc5Konqueror 3.0-rc4Konqueror 3.0-rc3Konqueror 3.0-rc2Konqueror 3.0-rc1Konqueror 3.0Konqueror 2.2.2-3Konqueror 2.2.2Konqueror 2.2.1Konqueror 2.2-12Konqueror 2.2-11Konqueror 2.1.2Konqueror 2.1.1 Leech Craft is an extensible cross platform internet-client.
Leech Craft 0.4.55LeechCraft 0.3.95LeechCraft 0.3.70LeechCraft 0.3.55 Text mode browser for Unix and OS/2 Click on any string to get more details Links 6.9Links 2.7Links 2.3pre1Links 2.2Links 2.1pre9Links 2.1pre37Links 2.1pre33Links 2.1pre32Links 2.1pre31Links 2.1pre30Links 2.1pre28Links 2.1pre26Links 2.1pre23Links 2.1pre20Links 2.1pre19Links 2.1pre18Links 2.1pre17Links 2.1pre16Links 2.1pre15Links 2.1pre11Links 2.1preLinks 2.1Links 2.xpre7Links 2.0Links 1.00pre3Links 1.00pre20Links 1.00pre12Links 0.99Links 0.98Links 0.96 Logo is an open source web browser that is written completely in Java.
Landscape 126.96.36.19946Lunascape 188.8.131.5269Lunascape 184.108.40.20636Lunascape 220.127.116.1151Lunascape 18.104.22.168Lunascape 22.214.171.12429Lunascape 126.96.36.19903Lunascape 188.8.131.5229Lunascape 184.108.40.20645Lunascape 220.127.116.1177Lunascape 18.104.22.16880Lunascape 22.214.171.12476Lunascape 126.96.36.19978Lunascape 188.8.131.5295Lunascape 184.108.40.20640Lunascape 220.127.116.1163Lunascape 18.104.22.16894Lunascape 22.214.171.12459Lunascape 126.96.36.199Lunascape 5.1.4Lunascape 188.8.131.52Lunascape 184.108.40.206Lunascape 220.127.116.11Lunascape 18.104.22.168Lunascape 22.214.171.124Lunascape 126.96.36.199Lunascape 188.8.131.52Lunascape 184.108.40.206Lunascape 220.127.116.11Lunascape 18.104.22.168Lunascape 22.214.171.124Lunascape 5.0 alpha3Lunascape 5.0 alpha2Lunascape 5.0 alpha1Lunascape 126.96.36.199Lunascape 188.8.131.52Lunascape 184.108.40.206Lunascape 220.127.116.11Lunascape 18.104.22.168Lunascape 22.214.171.124Lunascape 4.8.1Lunascape 4.7.2Lunascape 4.0.1Lunascape 3.0.4Lunascape 2.1.3 Multiplatform text browser, initially developed in 1992 at the University of Kansas Click on any string to get more details Minefield is a code name for Mozilla Firefox’s nightly trunk builds.
Similar thinking has resulted in the nightly trunk builds (bleeding-edge test binaries that will eventually form the basis of the next Firefox version) being rebranded as Minefield Click on any string to get more details Minefield 4.0b4preMinefield 4.0b2preMinefield 4.0a1preMinefield 3.7a5preMinefield 3.7a4preMinefield 3.7a3preMinefield 3.7a1preMinefield 3.6a1preMinefield 3.2a1preMinefield 3.1b3preMinefield 3.1b2preMinefield 3.1b2Minefield 3.1b1preMinefield 3.1a2preMinefield 3.1a1preMinefield 3.0preMinefield 3.0b5preMinefield 3.0b4preMinefield 3.0b3preMinefield 3.0b3Minefield 3.0b2preMinefield 3.0b2Minefield 3.0a9preMinefield 3.0a8preMinefield 3.0a7preMinefield 3.0a6preMinefield 3.0a5preMinefield 3.0a4preMinefield 3.0a3preMinefield 3.0a3Minefield 3.0a2preMinefield 3.0a2Minefield 3.0a1Minefield 3.0.7Minefield 3.0.6Minefield 3.0.5preMinefield 3.0.4Minefield 3.0.1Minefield 3.0 Click on any string to get more details Mozilla 2.2Mozilla 2.0b4Mozilla 1.9a3preMozilla 1.9.2a1preMozilla 126.96.36.199Mozilla 188.8.131.52Mozilla 184.108.40.206Mozilla 1.9.1b3Mozilla 220.127.116.11Mozilla 18.104.22.168Mozilla 22.214.171.124Mozilla 126.96.36.199Mozilla 188.8.131.52Mozilla 184.108.40.206Mozilla 220.127.116.11Mozilla 18.104.22.168Mozilla 22.214.171.124Mozilla 1.9Mozilla 1.8b2Mozilla 1.8bMozilla 1.8a6Mozilla 1.8a5Mozilla 1.8a4Mozilla 1.8a3Mozilla 1.8a1Mozilla 1.8.1a2Mozilla 126.96.36.199Mozilla 188.8.131.52Mozilla 184.108.40.206Mozilla 220.127.116.11Mozilla 18.104.22.168preMozilla 22.214.171.124Mozilla 126.96.36.199Mozilla 188.8.131.52Mozilla 184.108.40.206Mozilla 220.127.116.11Mozilla 18.104.22.168Mozilla 22.214.171.124Mozilla 126.96.36.199Mozilla 188.8.131.52Mozilla 184.108.40.206Mozilla 220.127.116.11Mozilla 18.104.22.168Mozilla 22.214.171.124eolMozilla 126.96.36.199Mozilla 1.8Mozilla 1.7bMozilla 1.7.9Mozilla 1.7.8Mozilla 1.7.7Mozilla 1.7.6Mozilla 1.7.5Mozilla 1.7.3Mozilla 1.7.2Mozilla 1.7.13Mozilla 1.7.12Mozilla 1.7.11Mozilla 1.7.10Mozilla 1.7.1Mozilla 188.8.131.52Mozilla 1.7Mozilla 1.6aMozilla 1.6Mozilla 1.5bMozilla 1.5aMozilla 1.5.1Mozilla 1.5Mozilla 1.4bMozilla 1.4aMozilla 1.4.3Mozilla 1.4.2Mozilla 1.4.1Mozilla 1.4Mozilla 1.3bMozilla 1.3aMozilla 1.3.1Mozilla 1.3Mozilla 1.2bMozilla 1.2aMozilla 1.2.1Mozilla 1.2Mozilla 1.1bMozilla 1.1aMozilla 1.1Mozilla 1.0rc3Mozilla 1.0rc2Mozilla 1.0rc1Mozilla 1.0.2Mozilla 1.0.1Mozilla 1.0.0Mozilla 0.9.9Mozilla 0.9.8Mozilla 0.9.7Mozilla 0.9.6Mozilla 0.9.5Mozilla 0.9.4Mozilla 0.9.3Mozilla 0.9.2.1Mozilla 0.9.2Mozilla My Internet Browser.
Czech browser based on Firefox Click on any string to get more details Myibrow 4alpha2myibrow 184.108.40.206 Click on any string to get more details MyIE2 After Firefox3.5 (“Shiretoko”), the next version of Firefox is being developed under the project name Amorous “.
Amorous 3.6a2preNamoroka 3.6a1Namoroka 3.6.9preNamoroka 3.6.8Namoroka 3.6.6preNamoroka 3.6.5preNamoroka 3.6.3preNamoroka 3.6.3Namoroka 3.6.2preNamoroka 3.6.20preNamoroka 3.6.19preNamoroka 3.6.18preNamoroka 3.6.17preNamoroka 3.6.17Namoroka 3.6.15preNamoroka 3.6.14preNamoroka 3.6.13Namoroka 3.6.12preNamoroka 3.6.10preNamoroka 3.6.10Namoroka 3.6 Click on any string to get more details Netscape Pre-0.2Navscape Pre-0.1 Mosaic was the first popular World Wide Web browser and Gopher client. It was the first browser to actually implement images embedded in the text, rather than displayed in a separate window.
Mosaic was developed at the National Center for Super computing Applications (NASA) beginning in late 1992. NASA released the browser in 1993, and officially discontinued development and support on January 7, 1997.
“Crawler” is a generic term for any program (such as a robot or spider) that is used to automatically discover and scan websites by following links from one webpage to another. This table lists information about the common Google crawlers you may see in your referrer logs, and how they should be specified in robots.
Txt to match a crawler type when writing crawl rules for your site. If you need to verify that the visitor is Google bot, you should use reverse DNS lookup.
Mozilla/5.0 (Linux; Android 8.0; Pixel 2 Build/OPD3.170816.012; DuplexWeb-Google/1.0) Apple WebKit/537.36 (HTML, like Gecko) Chrome/74.0.3729.131 Mobile Safari/537.36 (Retrieves favicons for various services) Mozilla/5.0 (X11; Linux x86_64) Apple WebKit/537.36 (HTML, like Gecko) Chrome/49.0.2623.75 Safari/537.36 Google Favicon Web Light error Does not respect robots.
Mozilla/5.0 (Linux; Android 4.2.1; en-us; Nexus 5 Build/JOP40D) Apple WebKit/535.19 (HTML, like Gecko; googleweblight) Chrome/38.0.1025.166 Mobile Safari/535.19 ‡ Chrome/ W.×.Y.Z in user agents If you are searching your logs or filtering your server for an user agent with this pattern, you probably should use wildcards for the version number rather than specifying an exact version number.
Some pages use multiple robots meta tags to specify directives for different crawlers, like this: Txt is a text file webmasters create to instruct web robots (typically search engine robots) how to crawl pages on their website.
Txt file is part of the robots' exclusion protocol (REP), a group of web standards that regulate how robots crawl the web, access and index content, and serve that content up to users. The REP also includes directives like meta robots, as well as page-, subdirectory-, or site-wide instructions for how search engines should treat links (such as “follow” or “no follow”).
Txt files indicate whether certain user agents (web-crawling software) can or cannot crawl parts of a website. These crawl instructions are specified by “disallowing” or “allowing” the behavior of certain (or all) user agents.
Minot, disco bot, and Slurp are all called out specifically, so this user -agents will only pay attention to the directives in their sections of the robots. Txt file would tell all web crawlers not to crawl any pages on www.example.com, including the homepage.
Allowing all web crawlers access to all content Txt file tells web crawlers to crawl all pages on www.example.com, including the homepage.
Txt file), it will proceed to crawl other information on the site. Txt is case-sensitive: the file must be named “robots.
This is especially common with more nefarious crawlers like malware robots or email address scrapers. Txt to the end of any root domain to see that website’s directives (if that site has a robot.
Each subdomain on a root domain uses separate robots. It’s generally a best practice to indicate the location of any sitemaps associated with this domain at the bottom of the robots.
Note this command is only supported by Google, Ask, Bing, and Yahoo. When it comes to the actual URLs to block or allow, robots.
Txt files can get fairly complex as they allow the use of pattern-matching to cover a range of possible URL options. Google and Bing both honor two regular expressions that can be used to identify pages or subfolders that an SEO wants to be excluded.
* is a wildcard that represents any sequence of characters $ matches the end of the URL Google offers a great list of possible pattern-matching syntax and examples here.
But, they’ll only look for that file in one specific place: the main directory (typically your root domain or homepage). Txt, it would not be discovered by user agents and thus the site would be treated as if it had no robots file at all.
Txt file is found, always include it in your main directory or root domain. Txt files control crawler access to certain areas of your site.
This blog post walks through some interactive examples. Make sure you’re not blocking any content or sections of your website you want crawled.
Txt, meta robots, or otherwise), the linked resources will not be crawled and may not be indexed. If you have pages to which you want equity to be passed, use a different blocking mechanism other than robots.
Txt to prevent sensitive data (like private user information) from appearing in SERP results. Txt directives on your root domain or homepage), it may still get indexed.
If you want to block your page from search results, use a different method like password protection or the no index meta directive. Most user agents from the same search engine follow the same rules so there’s no need to specify directives for each of a search engine’s multiple crawlers, but having the ability to do so does allow you to fine-tune how your site content is crawled.
If you change the file and want to update it more quickly than is occurring, you can submit your robots. Txt dictates site or directory-wide crawl behavior, whereas meta and x-robots can dictate indexation behavior at the individual page (or page element) level.
navigator.sergeant : This method reads the navigator object when the page load is finished. navigator.sergeant : This method clones the “navigator” object exactly when page is about to render to prevent any external scripts from altering it later.
Tab : Could be one of “navigator”, “UA_prayer”, “platform_JS” which indicates the default rendering engine that is used to display the results. Verbose : Could be one of “true” or “false” values which indicates whether the page uses all methods or just the active one.
User agents are the strings of text which specify the browser and operating system of web servers. User agents are present in HTTP headers when the browser wants to communicate with a server.
Each browser has its specific user agent string and web servers utilize this information to deliver appropriate material across different operating systems. An example of this is the mobile version of webpages in devices; usually slimmed down and organized vertically for user ease.
Web servers provide the bots with special treatments and verifications such as mandatory registrations, screens, etc. Mozilla was considerably more advanced in terms of connectivity and security than Mosaic because of the ease of supported frames it provided.
This was a remarkable advancement considering the other browsers made use of sending old pages without any frames at all. However, there was still no receiving end of webpages with frames, because they were just shared with Mozilla browsers.