.\" generated by cd2nroff 0.1 from CURLOPT_USERAGENT.md
.TH CURLOPT_USERAGENT 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_USERAGENT \- HTTP user\-agent header
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERAGENT, char *ua);
.fi
.SH DESCRIPTION
Pass a pointer to a null\-terminated string as parameter. It is used to set the
User\-Agent: header field in the HTTP request sent to the remote server. You
can also set any custom header with \fICURLOPT_HTTPHEADER(3)\fP.

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL, no User\-Agent: header is used.
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    curl_easy_setopt(curl, CURLOPT_USERAGENT, "Dark Secret Ninja/1.0");

    curl_easy_perform(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.1
.SH RETURN VALUE
Returns CURLE_OK if HTTP is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH SEE ALSO
.BR CURLOPT_CUSTOMREQUEST (3),
.BR CURLOPT_HTTPHEADER (3),
.BR CURLOPT_REFERER (3),
.BR CURLOPT_REQUEST_TARGET (3)