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| .TH CURLOPT_TCP_NODELAY 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options" |
| |
| .SH NAME |
| CURLOPT_TCP_NODELAY \- set the TCP_NODELAY option |
| .SH SYNOPSIS |
| #include <curl/curl.h> |
| |
| CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_NODELAY, long nodelay); |
| .SH 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 will have no effect |
| after the connection has been established. |
| |
| Setting this option to 1L will disable TCP's Nagle algorithm on this |
| connection. The purpose of this algorithm is to try to minimize the number of |
| small packets on the network (where "small packets" means TCP segments less |
| than the Maximum Segment Size (MSS) 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 |
| All |
| .SH EXAMPLE |
| .nf |
| 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 AVAILABILITY |
| Always. The default was changed to 1 from 0 in 7.50.2. |
| .SH RETURN VALUE |
| Returns CURLE_OK |
| .SH "SEE ALSO" |
| .BR CURLOPT_SOCKOPTFUNCTION "(3), " CURLOPT_TCP_KEEPALIVE "(3), " |
