{"json_modified": "2016-10-19T03:04:53.329838", "uuid": "583a6b48-1862-42b9-b56e-e1e118df87c5", "title": "Idempotent", "url": "/en-US/docs/Glossary/Idempotent", "tags": ["glossary", "WebMechanics", "Glossary"], "translations": [{"uuid": "a2ed1f84-996f-442f-9ee4-41200ff3fbb7", "title": "\u0418\u0434\u0435\u043c\u043f\u043e\u0442\u0435\u043d\u0442\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434", "url": "/ru/docs/%D0%A1%D0%BB%D0%BE%D0%B2%D0%B0%D1%80%D1%8C/Idempotent", "tags": ["glossary", "HTTP", "Glossary"], "summary": "\u041c\u0435\u0442\u043e\u0434 HTTP \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0438\u0434\u0435\u043c\u043f\u043e\u0442\u0435\u043d\u0442\u043d\u044b\u043c, \u0435\u0441\u043b\u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u043d\u044b\u0439 \u0438\u0434\u0435\u043d\u0442\u0438\u0447\u043d\u044b\u0439 \u0437\u0430\u043f\u0440\u043e\u0441, \u0441\u0434\u0435\u043b\u0430\u043d\u043d\u044b\u0439 \u043e\u0434\u0438\u043d \u0438\u043b\u0438 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u0440\u0430\u0437 \u043f\u043e\u0434\u0440\u044f\u0434, \u0438\u043c\u0435\u0435\u0442 \u043e\u0434\u0438\u043d \u0438 \u0442\u043e\u0442 \u0436\u0435 \u044d\u0444\u0444\u0435\u043a\u0442, \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u044f\u044e\u0449\u0438\u0439 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0441\u0435\u0440\u0432\u0435\u0440\u0430. \u0414\u0440\u0443\u0433\u0438\u043c\u0438 \u0441\u043b\u043e\u0432\u0430\u043c\u0438, \u0438\u0434\u0435\u043c\u043f\u043e\u0442\u0435\u043d\u0442\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u043d\u0435 \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c \u043d\u0438\u043a\u0430\u043a\u0438\u0445 \u043f\u043e\u0431\u043e\u0447\u043d\u044b\u0445 \u044d\u0444\u0444\u0435\u043a\u0442\u043e\u0432 (side-effects), \u043a\u0440\u043e\u043c\u0435 \u0441\u0431\u043e\u0440\u0430 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u0438\u043b\u0438 \u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439. \u041a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b <a href=\"/ru/docs/Web/HTTP/Methods/GET\" title=\"&#x414;&#x43E;&#x43A;&#x443;&#x43C;&#x435;&#x43D;&#x442;&#x430;&#x446;&#x438;&#x44F; &#x43E;&#x431; &#x44D;&#x442;&#x43E;&#x43C; &#x435;&#x449;&#x451; &#x43D;&#x435; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430;; &#x43F;&#x43E;&#x436;&#x430;&#x43B;&#x443;&#x439;&#x441;&#x442;&#x430;, &#x43F;&#x43E;&#x441;&#x43F;&#x43E;&#x441;&#x43E;&#x431;&#x441;&#x442;&#x432;&#x443;&#x439;&#x442;&#x435; &#x435;&#x451; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x438;&#x44E;!\"><code>GET</code></a>, <a href=\"/ru/docs/Web/HTTP/Methods/HEAD\" title=\"&#x414;&#x43E;&#x43A;&#x443;&#x43C;&#x435;&#x43D;&#x442;&#x430;&#x446;&#x438;&#x44F; &#x43E;&#x431; &#x44D;&#x442;&#x43E;&#x43C; &#x435;&#x449;&#x451; &#x43D;&#x435; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430;; &#x43F;&#x43E;&#x436;&#x430;&#x43B;&#x443;&#x439;&#x441;&#x442;&#x430;, &#x43F;&#x43E;&#x441;&#x43F;&#x43E;&#x441;&#x43E;&#x431;&#x441;&#x442;&#x432;&#x443;&#x439;&#x442;&#x435; &#x435;&#x451; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x438;&#x44E;!\"><code>HEAD</code></a>, <a href=\"/ru/docs/Web/HTTP/Methods/PUT\" title=\"&#x414;&#x43E;&#x43A;&#x443;&#x43C;&#x435;&#x43D;&#x442;&#x430;&#x446;&#x438;&#x44F; &#x43E;&#x431; &#x44D;&#x442;&#x43E;&#x43C; &#x435;&#x449;&#x451; &#x43D;&#x435; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430;; &#x43F;&#x43E;&#x436;&#x430;&#x43B;&#x443;&#x439;&#x441;&#x442;&#x430;, &#x43F;&#x43E;&#x441;&#x43F;&#x43E;&#x441;&#x43E;&#x431;&#x441;&#x442;&#x432;&#x443;&#x439;&#x442;&#x435; &#x435;&#x451; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x438;&#x44E;!\"><code>PUT</code></a> \u0438 <a href=\"/ru/docs/Web/HTTP/Methods/DELETE\" title=\"&#x414;&#x43E;&#x43A;&#x443;&#x43C;&#x435;&#x43D;&#x442;&#x430;&#x446;&#x438;&#x44F; &#x43E;&#x431; &#x44D;&#x442;&#x43E;&#x43C; &#x435;&#x449;&#x451; &#x43D;&#x435; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430;; &#x43F;&#x43E;&#x436;&#x430;&#x43B;&#x443;&#x439;&#x441;&#x442;&#x430;, &#x43F;&#x43E;&#x441;&#x43F;&#x43E;&#x441;&#x43E;&#x431;&#x441;&#x442;&#x432;&#x443;&#x439;&#x442;&#x435; &#x435;&#x451; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x438;&#x44E;!\"><code>DELETE</code></a> <strong>\u0438\u0434\u0435\u043c\u043f\u043e\u0442\u0435\u043d\u0442\u043d\u044b</strong>, \u043d\u043e \u043d\u0435 \u043c\u0435\u0442\u043e\u0434 <a href=\"/ru/docs/Web/HTTP/Methods/POST\" title=\"&#x414;&#x43E;&#x43A;&#x443;&#x43C;&#x435;&#x43D;&#x442;&#x430;&#x446;&#x438;&#x44F; &#x43E;&#x431; &#x44D;&#x442;&#x43E;&#x43C; &#x435;&#x449;&#x451; &#x43D;&#x435; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430;; &#x43F;&#x43E;&#x436;&#x430;&#x43B;&#x443;&#x439;&#x441;&#x442;&#x430;, &#x43F;&#x43E;&#x441;&#x43F;&#x43E;&#x441;&#x43E;&#x431;&#x441;&#x442;&#x432;&#x443;&#x439;&#x442;&#x435; &#x435;&#x451; &#x43D;&#x430;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x438;&#x44E;!\"><code>POST</code></a>. \u0422\u0430\u043a\u0436\u0435 \u0432\u0441\u0435 <a class=\"glossaryLink\" href=\"/ru/docs/&#x421;&#x43B;&#x43E;&#x432;&#x430;&#x440;&#x44C;/safe\" title=\"&#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x435;: &#x41C;&#x435;&#x442;&#x43E;&#x434; HTTP &#x44F;&#x432;&#x43B;&#x44F;&#x435;&#x442;&#x441;&#x44F; &#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x43C;, &#x435;&#x441;&#x43B;&#x438; &#x43E;&#x43D; &#x43D;&#x435; &#x43C;&#x435;&#x43D;&#x44F;&#x435;&#x442; &#x441;&#x43E;&#x441;&#x442;&#x43E;&#x44F;&#x43D;&#x438;&#x435; &#x441;&#x435;&#x440;&#x432;&#x435;&#x440;&#x430;. &#x414;&#x440;&#x443;&#x433;&#x438;&#x43C;&#x438; &#x441;&#x43B;&#x43E;&#x432;&#x430;&#x43C;&#x438;, &#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x439; &#x43C;&#x435;&#x442;&#x43E;&#x434; &#x43F;&#x440;&#x43E;&#x432;&#x43E;&#x434;&#x438;&#x442; &#x43E;&#x43F;&#x435;&#x440;&#x430;&#x446;&#x438;&#x438; &quot;&#x442;&#x43E;&#x43B;&#x44C;&#x43A;&#x43E; &#x447;&#x442;&#x435;&#x43D;&#x438;&#x435;&quot; (read-only). &#x41D;&#x435;&#x441;&#x43A;&#x43E;&#x43B;&#x44C;&#x43A;&#x43E; &#x441;&#x43B;&#x435;&#x434;&#x443;&#x44E;&#x449;&#x438;&#x435; &#x43C;&#x435;&#x442;&#x43E;&#x434;&#x43E;&#x432; HTTP &#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x435;: GET, HEAD &#x438;&#x43B;&#x438; OPTIONS. &#x412;&#x441;&#x435; &#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x435; &#x43C;&#x435;&#x442;&#x43E;&#x434;&#x44B; &#x44F;&#x432;&#x43B;&#x44F;&#x44E;&#x442;&#x441;&#x44F; &#x442;&#x430;&#x43A;&#x436;&#x435; &#x438;&#x434;&#x435;&#x43C;&#x43F;&#x43E;&#x442;&#x435;&#x43D;&#x442;&#x43D;&#x44B;&#x43C;&#x438;, &#x43A;&#x430;&#x43A; &#x438; &#x43D;&#x435;&#x43A;&#x43E;&#x442;&#x43E;&#x440;&#x44B;&#x435; &#x434;&#x440;&#x443;&#x433;&#x438;&#x435;, &#x43D;&#x43E; &#x43F;&#x440;&#x438; &#x44D;&#x442;&#x43E;&#x43C; &#x43D;&#x435;&#x431;&#x435;&#x437;&#x43E;&#x43F;&#x430;&#x441;&#x43D;&#x44B;&#x435;, &#x442;&#x430;&#x43A;&#x438;&#x435; &#x43A;&#x430;&#x43A; PUT &#x438;&#x43B;&#x438; DELETE.\">\u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u044b\u0435</a> \u043c\u0435\u0442\u043e\u0434\u044b \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u0438\u0434\u0435\u043c\u043f\u043e\u0442\u0435\u043d\u0442\u043d\u044b\u043c\u0438.", "localization_tags": [], "locale": "ru", "last_edit": "2016-10-19T03:04:48", "review_tags": []}], "modified": "2016-07-19T04:57:02", "label": "Idempotent", "localization_tags": [], "locale": "en-US", "id": 188809, "last_edit": "2016-07-19T04:56:58", "summary": "An HTTP method is <strong>idempotent</strong> if an identical request can be made once or several times in a row with the same effect while leaving the server in the same state. In other words, an idempotent method should not have any side-effects (except for keeping statistics). Implemented correctly, the <a href=\"/en-US/docs/Web/HTTP/Methods/GET\" title=\"The GET method requests a representation of the specified resource. Requests using GET should only retrieve data.\"><code>GET</code></a>, <a href=\"/en-US/docs/Web/HTTP/Methods/HEAD\" title=\"The HEAD method requests the headers that would be returned if the specified resource would be done with a GET. Such a request can be done before deciding to download a large resource to save bandwidth.\"><code>HEAD</code></a>, <a href=\"/en-US/docs/Web/HTTP/Methods/PUT\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>PUT</code></a>, and <a href=\"/en-US/docs/Web/HTTP/Methods/DELETE\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>DELETE</code></a> method are <strong>idempotent</strong>, but not the <a href=\"/en-US/docs/Web/HTTP/Methods/POST\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>POST</code></a> method. All <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/safe\" title=\"safe: An HTTP method is safe if it doesn't alter the state of the server. In other words, a method is safe if it leads to a read-only operation. Several common HTTP methods are safe: GET, HEAD, or OPTIONS. All safe methods are also idempotent as well as some, but not all, unsafe methods like PUT, or DELETE.\">safe</a> methods are also idempotent.", "sections": [{"id": "Learn_more", "title": "Learn more"}, {"id": "General_knowledge", "title": "General knowledge"}, {"id": "Technical_knowledge", "title": "Technical knowledge"}], "slug": "Glossary/Idempotent", "review_tags": []}