分类: 系统运维
2012-08-01 19:12:38
Note the keywords "HTTP-EQUIV", "Name" and "Content" are case-insensitive. Their values are also case-insensitive.
TAG NAME | EXAMPLE(S) | DESCRIPTION |
---|---|---|
AUTHOR | The author's name. | |
CACHE-CONTROL | HTTP 1.1. Allowed values = PUBLIC | PRIVATE | NO-CACHE | NO-STORE. Public - may be cached in public shared caches Private - may only be cached in private cache no-Cache - may not be cached no-Store - may be cached but not archived The directive CACHE-CONTROL:NO-CACHE indicates cached information should not be used and instead requests should be forwarded to the origin server. This directive has the same semantics as the. | |
CONTENT-LANGUAGE | CONTENT="en-US,fr"> | Declares the primary natural language(s) of the document. May be used by search engines to categorize by language. |
CONTENT-TYPE | CONTENT="text/html; charset=UTF-8"> | The HTTP content type may be extended to give the character set. It is recommended to always use this tag and to specify the charset. |
COPYRIGHT | A copyright statement. | |
DESCRIPTION | CONTENT="...summary of web page..."> | The text can be used when printing a summary of the document. The text should not contain any formatting information. Used by some search engines to describe your document. Particularly important if your document has very little text, is a frameset, or has extensive scripts at the top. |
EXPIRES | CONTENT="Mon, 22 Jul 2002 11:12:01 GMT"> | The date and time after which the document should be considered expired. An illegal EXPIRES date, e.g. "0", is interpreted as "now". Setting EXPIRES to 0 may thus be used to force a modification check at each visit. Web robots may delete expired documents from a search engine, or schedule a revisit. specifies that all HTTP date/time stamps MUST be generated in Greenwich Mean Time (GMT) and in RFC 1123 format. |
KEYWORDS | CONTENT="***, drugs, rock & roll"> | The keywords are used by some search engines to index your document in addition to words from the title and document body. Typically used for synonyms and alternates of title words. Consider adding frequent misspellings. e.g. heirarchy, hierarchy. |
PRAGMA NO-CACHE | This directive indicates cached information should not be used and instead requests should be forwarded to the origin server. This directive has the same semantics as the directive and is provided for backwards compatibility with HTTP/1.0. Clients SHOULD include both PRAGMA:NO-CACHE and CACHE-CONTROL:NO-CACHE when a no-cache request is sent to a server not known to be HTTP/1.1 compliant. HTTP/1.1 clients SHOULD NOT send the PRAGMA request-header. HTTP/1.1 caches SHOULD treat "PRAGMA:NO-CACHE" as if the client had sent "CACHE-CONTROL:NO-CACHE". Also see . | |
REFRESH | CONTENT="15;URL="> | Specifies a delay in seconds before the browser automatically reloads the document. Optionally, specifies an alternative URL to load, making this command useful for redirecting browsers to other pages. |
ROBOTS | | CONTENT="ALL | NONE | NOINDEX | INDEX| NOFOLLOW | FOLLOW | NOARCHIVE" default = empty = "ALL" "NONE" = "NOINDEX, NOFOLLOW" The CONTENT field is a comma separated list: |
GOOGLEBOT | In addition to the META Command above, Google supports a GOOGLEBOT command. With it, you can tell Google that you do not want the page archived, but allow other search engines to do so. If you specify this command, Google will not save the page and the page will be unavailable via its cache. See . |