r1699, r1700, r1701, r1702, r1707 merge: upstream parse_header fix and optimization, fix fastcgi_catch_stderr segfault merged in r1524: *) return NGX_HTTP_UPSTREAM_INVALID_HEADER for invalid status *) return NGX_ERROR instead of NGX_HTTP_INTERNAL_SERVER_ERROR in u->parse_header() *) return NGX_HTTP_UPSTREAM_INVALID_HEADER instead of NGX_HTTP_BAD_GATEWAY to go to a next upstream on invalid_header condition *) now ngx_conf_set_str_array_slot() tests NGX_CONF_UNSET_PTR this fixes fastcgi_catch_stderr segfault *) ngx_http_upstream_hide_headers_hash() *) proxy/fastcgi pass_header/hide_header use ngx_http_upstream_hide_headers_hash()