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.TH CURLOPT_USERAGENT 3 "November 04, 2020" "libcurl 7.78.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_USERAGENT \- set HTTP user-agent header
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERAGENT, char *ua);
.SH DESCRIPTION
Pass a pointer to a null-terminated string as parameter. It will be used to
set the User-Agent: header in the HTTP request sent to the remote server. This
can be used to fool servers or scripts. 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 by default.
.SH PROTOCOLS
HTTP, HTTPS
.SH EXAMPLE
.nf
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
As long as HTTP is supported
.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_REFERER "(3), " CURLOPT_HTTPHEADER "(3), "