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A request headers is an HTTP header that the client sends to the server.
HTTP request headers list | Browser Headers Viewer
If-Modified-Since| Type | Standard |
| Subype | HTTP |
| Related headers | Accept, Accept-Encoding, Accept-Charset, Accept-Language, Authorization, Connection, Content-Length, Content-Type, Cookie, Dnt, Expect, From, Host, If-None-Match, Prefer, Range, Referer, User-Agent, X-Auth-Token, X-Request-Id |
| Last seen | 2024-11-03 18:17:08 |
| Note | Allows a 304 Not Modified to be returned if content is unchanged. |
| Syntax | If-Modified-Since: <day-name>, <day> <month> <year> <hour>:<minute>:<second> GMT |
Example header value:Sun, 28 Mar 2021 04:51:35 GMT |
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