curl / libcurl / API / curl_easy_setopt / CURLOPT_USERAGENT

CURLOPT_USERAGENT explained

Name

CURLOPT_USERAGENT - HTTP user-agent header

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERAGENT, char *ua);

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 CURLOPT_HTTPHEADER.

The application does not have to keep the string around after setting this option.

Default

NULL, no User-Agent: header is used by default.

Protocols

HTTP, HTTPS

Example

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);
}

Availability

As long as HTTP is supported

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.

See also

CURLOPT_REFERER(3), CURLOPT_HTTPHEADER(3),

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