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+---
+title: User-Agent
+slug: Web/HTTP/Заголовки/User-Agent
+translation_of: Web/HTTP/Headers/User-Agent
+---
+<div>{{HTTPSidebar}}</div>
+
+<p><span id="result_box" lang="uk"><span>Заголовок запиту User-Agent містить характерний рядок, який дозволяє однорідним мережевим протоколам ідентифікувати тип програми, операційну систему, постачальника програмного забезпечення або версію програмного забезпечення запитуючого користувацького агента програмного забезпечення.</span></span></p>
+
+<div class="note">
+<p><span class="short_text" id="result_box" lang="uk"><span>Будь ласка, прочитайте</span></span> <a href="/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent">Виявлення браузера за допомогою агента користувача</a> <span id="result_box" lang="uk"><span>і чому обслуговування різних веб-сторінок або служб для різних браузерів зазвичай погана ідея.</span></span></p>
+</div>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Header type</th>
+   <td>{{Glossary("Request header")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Forbidden header name")}}</th>
+   <td>no</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Синтаксис"><span class="short_text" id="result_box" lang="uk"><span>Синтаксис</span></span></h2>
+
+<pre class="syntaxbox">User-Agent: &lt;product&gt; / &lt;product-version&gt; &lt;comment&gt;
+
+Common format for web browsers:
+
+User-Agent: Mozilla/&lt;version&gt; (&lt;system-information&gt;) &lt;platform&gt; (&lt;platform-details&gt;) &lt;extensions&gt;
+</pre>
+
+<h2 id="Директиви"><span class="short_text" id="result_box" lang="uk"><span>Директиви</span></span></h2>
+
+<dl>
+ <dt>&lt;product&gt;</dt>
+ <dd>A product identifier</dd>
+ <dt>&lt;product-version&gt;</dt>
+ <dd>A version number of the product.</dd>
+ <dt>&lt;comment&gt;</dt>
+ <dd>Zero or more comments containing sub product information, for example.</dd>
+</dl>
+
+<h2 id="Firefox_UA_string">Firefox UA string</h2>
+
+<p>For more details on Firefox and Gecko based user agent strings, see the <a href="/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox">Firefox user agent string reference</a>. The UA string of Firefox itself is broken down into four components:</p>
+
+<p><strong>Mozilla/5.0 (<em>platform</em>; rv:<em>geckoversion</em>) Gecko/<em>geckotrail</em> Firefox/<em>firefoxversion</em></strong></p>
+
+<ul>
+ <li><em><strong>Mozilla/5.0</strong></em> is the general token that says the browser is Mozilla compatible, and is common to almost every browser today.</li>
+ <li><strong><em>platform</em></strong> describes the native platform the browser is running on (e.g. Windows, Mac, Linux or Android), and whether or not it's a mobile phone. Firefox OS phones simply say "Mobile"; the web is the platform. Note that <strong><em>platform</em></strong> can consist of multiple "; "-separated tokens. See below for further details and examples.</li>
+ <li><strong>rv:<em>geckoversion</em></strong> indicates the release version of Gecko (such as <em>"17.0"</em>). In recent browsers, <strong><em>geckoversion</em></strong> is the same as <strong><em>firefoxversion</em></strong>.</li>
+ <li><strong><em>Gecko/geckotrail</em></strong> indicates that the browser is based on Gecko.</li>
+ <li>On Desktop, <em><strong>geckotrail</strong></em> is the fixed string "20100101"</li>
+ <li><em><strong>Firefox/firefoxversion</strong></em> indicates the browser is Firefox, and provides the version (such as "<em>17.0"</em>).</li>
+</ul>
+
+<h3 id="Examples">Examples</h3>
+
+<pre>Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0
+Mozilla/5.0 (Macintosh; Intel Mac OS X <em>x.y</em>; rv:42.0) Gecko/20100101 Firefox/42.0
+</pre>
+
+<h2 id="Chrome_UA_string">Chrome UA string</h2>
+
+<p>The Chrome (or Chromium/blink-based engines) user agent string is similar to the Firefox format. For compatibility, it adds strings like "KHTML, like Gecko" and "Safari".</p>
+
+<h3 id="Examples_2">Examples</h3>
+
+<pre>Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36</pre>
+
+<h2 id="Opera_UA_string">Opera UA string</h2>
+
+<p>The Opera browser is also based on the blink engine, which is why it almost looks the same, but adds "OPR/&lt;version&gt;".</p>
+
+<h3 id="Examples_3">Examples</h3>
+
+<pre>Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36 OPR/38.0.2220.41</pre>
+
+<h2 id="Safari_UA_string">Safari UA string</h2>
+
+<p>In this example, the user agent string is mobile safari version. It contains the word "Mobile".</p>
+
+<h3 id="Examples_4">Examples</h3>
+
+<pre>Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1</pre>
+
+<h2 id="Internet_Explorer_UA_string">Internet Explorer UA string</h2>
+
+<h3 id="Examples_5">Examples</h3>
+
+<pre>Mozilla/5.0 (compatible; MSIE 9.0; Windows Phone OS 7.5; Trident/5.0; IEMobile/9.0)</pre>
+
+<h2 id="Crawler_and_bot_UA_strings">Crawler and bot UA strings</h2>
+
+<h3 id="Examples_6">Examples</h3>
+
+<pre>Googlebot/2.1 (+http://www.google.com/bot.html)</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Title</th>
+  </tr>
+  <tr>
+   <td>{{RFC("7231", "User-Agent", "5.5.3")}}</td>
+   <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.headers.User-Agent")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="https://hacks.mozilla.org/2013/09/user-agent-detection-history-and-checklist/">User-Agent detection, history and checklist</a></li>
+ <li><a href="/en-US/docs/Web/HTTP/Headers/User-Agent/Firefox">Firefox user agent string reference</a></li>
+ <li>
+  <p><a href="/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent">Browser detection using the user agent</a></p>
+ </li>
+</ul>