{"json_modified": "2016-08-11T03:18:39.244099", "uuid": "51f0462c-b5ab-44ec-85ea-c38d29fd7357", "title": "General header", "url": "/en-US/docs/Glossary/General_header", "tags": ["glossary", "WebMechanics", "Glossary"], "translations": [], "modified": "2016-08-11T03:18:39", "label": "General header", "localization_tags": [], "locale": "en-US", "id": 188827, "last_edit": "2016-07-19T06:07:03", "summary": "A <strong>general header</strong> is an <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Header\" title=\"HTTP header: An HTTP header is a field of an HTTP request or response that passes additional information, altering or precising the semantics of the message or of the body. Headers are case-insensitive, begins at the start of a line and are immediately followed by a ':' and a value depending of the header itself. The value finish at the next CR or at the end of the message.\">HTTP header</a> that can be used for both, request and response messages, but don't apply to the content itself. Depending on the context they are used in, general headers are either <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Response_header\" title=\"response: A response header is an HTTP header that can be used in an HTTP request and that doesn't relate to the content of the message. Response headers, like Age, Location or Server are used to give a more detailed context of the response.\">response</a> or <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/request_header\" title=\"request headers: A request header is an HTTP header that can be used in an HTTP request, and that doesn't relate to the content of the message. Request headers, like Accept, Accept-*, or If-* allow to perform conditional requests; others like Cookie, User-Agent or Referer precise the context so that the server can tailor the answer.\">request headers</a>. However, they are not <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/entity_header\" title=\"entity headers: An entity header is an HTTP header describing the content of the body of the message. Entity headers are used in both, HTTP requests and responses. Headers like Content-Length, Content-Language, Content-Encoding are entity headers.\">entity headers</a>.", "sections": [], "slug": "Glossary/General_header", "review_tags": []}