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CURLOPT_TCP_NODELAY(3)     Library Functions Manual     CURLOPT_TCP_NODELAY(3)


NAME

       CURLOPT_TCP_NODELAY - the TCP_NODELAY option


SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay);


DESCRIPTION

       Pass a long specifying whether the TCP_NODELAY 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.


DEFAULT

       1


PROTOCOLS

       This functionality affects tcp only


EXAMPLE

       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);
         }
       }


HISTORY

       The default was changed to 1 from 0 in 7.50.2.


AVAILABILITY

       Added in curl 7.11.2


RETURN VALUE

       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


SEE ALSO

       CURLOPT_BUFFERSIZE(3), CURLOPT_SOCKOPTFUNCTION(3),
       CURLOPT_TCP_KEEPALIVE(3)

libcurl                           2025-02-08            CURLOPT_TCP_NODELAY(3)

curl 8.12.0 - Generated Wed Feb 19 09:36:00 CST 2025
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