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)
Changing the useragentstring can be useful in certain scenarios when some website's functionality is locked down to the specific platform and you need to bypass the restriction. In today's article, we will learn how to change the useragentstring in the popular Opera browser.
Mozilla/5.0 (platform ; RV: gecko version) Gecko/ gecko trail Firefox / firefoxversion Firefox OS phones say Mobile “; the web is the platform.
An MTA is an application that routes and transmits electronic mail from one node on a network to another. On a network node, exists an email client that is used to send and receive messages to and from the mail server, an email client also makes use of the SMTP protocol but it is not necessarily an MTA.
WebKit (18,642,786) Blink (9,913,314) Trident (1,737,329) Presto (368,303) Gecko (299,203) Edge HTML (25,016) Gonna (3,639) HTML (3,483) Seafront (3,419) If you need to integrate the user agent parser directly into your website or system then it's very simple to use the API.
Platform identifiers change based on the operating system being used, and version numbers also increment as time passes. Mapping UA string tokens to a more human-readable browser name for use in code is a common pattern on the web today.
And behold, then came a new web browser known as “Mozilla”, being short for “Mosaic Killer,” but Mosaic was not amused, so the public name was changed to Netscape, and Netscape called itself Mozilla/1.0 (Win3.1), and there was more rejoicing. And so Microsoft made their own web browser, which they called Internet Explorer, hoping for it to be a “Netscape Killer”.