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<dd>HTTP introduces a set of headers, starting with <code>Accept-</code> as a way for a browser to announce the format, language, or encoding it prefers. This article explains how this advertisement happens, how the server is expected to react and how it will choose the most adequate response.</dd>
<p>Запись в кеше может также состоять из множества ответов, различаемых по вторичному ключу, если при формировании ответа производится согласование данных. Подробнее об этом рассказано <ahref="#Varying_responses">ниже</a>, в разделе, посвящённом заголовку {{HTTPHeader("Vary")}}.</p>
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---
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<div>{{HTTPSidebar}}</div>
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<p><spanclass="seoSummary">В этой статье описывается, какие значения используются в HTTP-заголовке <code><ahref="/en-US/docs/Web/HTTP/Headers/Accept">Accept</a></code> по умолчанию в зависимости от конкретного запроса и версии браузера.</span></p>
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<p>В этой статье описывается, какие значения используются в HTTP-заголовке <code><ahref="/en-US/docs/Web/HTTP/Headers/Accept">Accept</a></code> по умолчанию в зависимости от конкретного запроса и версии браузера.</p>
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<h2id="Значения_по_умолчанию">Значения по умолчанию</h2>
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<code>*/*</code> (начиная с Firefox 47)<br>
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<code>image/png,image/*;q=0.8,*/*;q=0.5</code> (в более ранних версиях)</p>
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</td>
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<td>Значение можно изменить с помощью параметра <code>image.http.accept</code>. <aclass="external" href="https://hg.mozilla.org/mozilla-central/file/tip/modules/libpref/init/all.js#l4735"><spanstyle="font-size: x-small;">исходный код</span></a></td>
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<td>Значение можно изменить с помощью параметра <code>image.http.accept</code>. <aclass="external" href="https://hg.mozilla.org/mozilla-central/file/tip/modules/libpref/init/all.js#l4735">исходный код</a></td>
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<td>Safari</td>
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<div>{{HTTPSidebar}}</div>
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<p><spanclass="seoSummary"><ahref="/en-US/docs/Web/HTTP/CORS">Cross-Origin Resource Sharing</a> ({{Glossary("CORS")}}) is a standard that allows a server to relax the <ahref="/en-US/docs/Web/Security/Same-origin_policy">same-origin policy</a>. This is used to explicitly allow some cross-origin requests while rejecting others.</span> For example, if a site offers an embeddable service, it may be necessary to relax certain restrictions. Setting up such a CORS configuration isn't necessarily easy and may present some challenges. In these pages, we'll look into some common CORS error messages and how to resolve them.</p>
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<p><ahref="/en-US/docs/Web/HTTP/CORS">Cross-Origin Resource Sharing</a> ({{Glossary("CORS")}}) is a standard that allows a server to relax the <ahref="/en-US/docs/Web/Security/Same-origin_policy">same-origin policy</a>. This is used to explicitly allow some cross-origin requests while rejecting others. For example, if a site offers an embeddable service, it may be necessary to relax certain restrictions. Setting up such a CORS configuration isn't necessarily easy and may present some challenges. In these pages, we'll look into some common CORS error messages and how to resolve them.</p>
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<p>If the CORS configuration isn't setup correctly, the browser console will present an error like <code>"Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at $somesite"</code> indicating that the request was blocked due to violating the CORS security rules. This might not necessarily be a set-up mistake, though. It's possible that the request is in fact intentionally being disallowed by the user's web application and remote external service. However, If the endpoint is meant to be available, some debugging is needed to succeed.</p>
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<p>The text of the error message will be something similar to the following:</p>
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<pre>Cross<spanclass="message-body-wrapper"><spanclass="message-flex-body"><spanclass="devtools-monospace message-body">-Origin Request Blocked: The Same Origin Policy disallows
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<pre>Cross-Origin Request Blocked: The Same Origin Policy disallows
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reading the remote resource at <em>https://some-url-here</em>. (<em>Reason:
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additional information here</em>).</span></span></span></pre>
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additional information here</em>).</pre>
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<divclass="note">
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<p><spanclass="message-body-wrapper"><spanclass="message-flex-body"><spanclass="devtools-monospace message-body"><strong>Note:</strong> For security reasons, specifics about what went wrong with a CORS request <em>are not available to JavaScript code</em>. All the code knows is that an error occurred. The only way to determine what specifically went wrong is to look at the browser's console for details.</span></span></span></p>
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<p><strong>Note:</strong> For security reasons, specifics about what went wrong with a CORS request <em>are not available to JavaScript code</em>. All the code knows is that an error occurred. The only way to determine what specifically went wrong is to look at the browser's console for details.</p>
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