HEAD - HTTP 编辑

The HTTP HEAD method requests the headers that would be returned if the HEAD request's URL was instead requested with the HTTP GET method. For example, if a URL might produce a large download, a HEAD request could read its Content-Length header to check the filesize without actually downloading the file.

A response to a HEAD method should not have a body. If it has one anyway, that body must be ignored: any entity headers that might describe the erroneous body are instead assumed to describe the response which a similar GET request would have received.

If the response to a HEAD request shows that a cached URL response is now outdated, the cached copy is invalidated even if no GET request was made.

Syntax

HEAD /index.html

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• GET