+/** \brief encode SOLR request (HTTP)
+ \param hreq HTTP request to be modified (with encoded request)
+ \param srw_pdu SRW request
+ \param encode ODR for result
+ \param charset character set for request (may be NULL)
+ \retval -1 fail
+ \retval 0 OK
+*/
+YAZ_EXPORT int yaz_solr_encode_request(Z_HTTP_Request *hreq, Z_SRW_PDU *srw_pdu,
+ ODR encode, const char *charset);