Got this working with the following on 0.7.44: *************** ngx_http_memcached_create_request(ngx_ht *** 280,285 **** --- 281,289 ---- ctx->key.len = b->last - ctx->key.data; + // strlower key + ngx_strlow(ctx->key.data, ctx->key.data, ctx->key.len); + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http memcached request: \"%V\"", &ctx->key);