.\" generated by cd2nroff 0.1 from CURLOPT_TCP_NODELAY.md
.TH CURLOPT_TCP_NODELAY 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_TCP_NODELAY \- the TCP_NODELAY option
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay);
.fi
.SH DESCRIPTION
Pass a long specifying whether the \fITCP_NODELAY\fP option is to be set or
cleared (1L = set, 0 = clear). The option is set by default. This has no
effect after the connection has been established.

Setting this option to 1L disables the Nagle algorithm on connections created
using this handle. The purpose of this algorithm is to minimize the number of
small packets on the network (where "small packets" means TCP segments less
than the Maximum Segment Size for the network).

Maximizing the amount of data sent per TCP segment is good because it
amortizes the overhead of the send. However, in some cases small segments may
need to be sent without delay. This is less efficient than sending larger
amounts of data at a time, and can contribute to congestion on the network if
overdone.
.SH DEFAULT
1
.SH PROTOCOLS
This functionality affects tcp only
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    /* leave Nagle enabled */
    curl_easy_setopt(curl, CURLOPT_TCP_NODELAY, 0);
    curl_easy_perform(curl);
  }
}
.fi
.SH HISTORY
The default was changed to 1 from 0 in 7.50.2.
.SH AVAILABILITY
Added in curl 7.11.2
.SH RETURN VALUE
Returns CURLE_OK
.SH SEE ALSO
.BR CURLOPT_BUFFERSIZE (3),
.BR CURLOPT_SOCKOPTFUNCTION (3),
.BR CURLOPT_TCP_KEEPALIVE (3)