httr (version 0.1.1)

HEAD: Get url headers.

Description

Get url headers.

Usage

HEAD(url = NULL, config = list(), ..., handle = NULL)

Arguments

url

the url of the page to retrieve

config

Additional configuration settings such as http authentication (authenticate), additional headers (add_headers), cookies (

...

Further parameters, such as query, path, etc, passed on to modify_url. These parameters must be named.

handle

The handle to use with this request. If not supplied, will be retrieved and reused from the handle_pool based on the scheme, hostname and port of the url. By default httr requests to

RF2616

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.

The response to a HEAD request MAY be cacheable in the sense that the information contained in the response MAY be used to update a previously cached entity from that resource. If the new field values indicate that the cached entity differs from the current entity (as would be indicated by a change in Content-Length, Content-MD5, ETag or Last-Modified), then the cache MUST treat the cache entry as stale.

See Also

Other http methods: BROWSE, DELETE, GET

Examples

HEAD("http://google.com")
HEAD("http://google.com")$headers