OSSL_HTTP_transfer
rsp = OSSL_HTTP_transfer(NULL, host, port, path, use_ssl,
rsp = OSSL_HTTP_transfer(&ctx->http_ctx, ctx->server, server_port,
BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx,
: OSSL_HTTP_transfer(NULL, NULL /* host */, NULL /* port */, path,
rsp = OSSL_HTTP_transfer(&rctx, NULL /* server */, NULL /* port */,