R: Get url HEADers.

HEAD {httr} | R Documentation

## 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 (`set_cookies`) etc. See `config` for full details and list of helpers.
`...` | Further named parameters, such as `query`, `path`, etc, passed on to `modify_url`. Unnamed parameters will be combined with `config`.
`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 the same scheme/host/port combo. This substantially reduces connection time, and ensures that cookies are maintained over multiple requests to the same host. See `handle_pool` for more details.

### RFC2616

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`, `PATCH`, `POST`, `PUT`, `VERB`

### Examples

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

[Package httr version 1.3.1 Index]