/** @page http_metainfo Querying of HTTP meta-info for an URL

For historical reasons (see @ref verification), the library provides
a set of functions that may be used to query the HTTP meta-info headers
(e.g. content-type, content-length) for an URL from the server. The file
extension is determined from the returned content-type, and at best,
only a guess.

@code
quvi_http_metainfo_t qmi;
char *ct, *fe;
double cl;

qmi = quvi_http_metainfo_new(q, URL);
abort_if_error();
quvi_http_metainfo_get(qmi, QUVI_HTTP_METAINFO_PROPERTY_FILE_EXTENSION, &fe);
quvi_http_metainfo_get(qmi, QUVI_HTTP_METAINFO_PROPERTY_CONTENT_TYPE, &ct);
quvi_http_metainfo_get(qmi, QUVI_HTTP_METAINFO_PROPERTY_LENGTH_BYTES, &cl);
quvi_http_metainfo_free(qmi);

@endcode
*/