.\" generated by cd2nroff 0.1 from CURLOPT_DEFAULT_PROTOCOL.md
.TH CURLOPT_DEFAULT_PROTOCOL 3 "2024-08-02" libcurl
.SH NAME
CURLOPT_DEFAULT_PROTOCOL \- default protocol to use if the URL is missing a
scheme name
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEFAULT_PROTOCOL,
                          char *protocol);
.fi
.SH DESCRIPTION
This option tells libcurl to use \fIprotocol\fP if the URL is missing a scheme
name.

Use one of these protocol (scheme) names:

dict, file, ftp, ftps, gopher, http, https, imap, imaps, ldap, ldaps, pop3,
pop3s, rtsp, scp, sftp, smb, smbs, smtp, smtps, telnet, tftp

An unknown or unsupported protocol causes error
\fICURLE_UNSUPPORTED_PROTOCOL\fP when libcurl parses a URL without a
scheme. Parsing happens when \fIcurl_easy_perform(3)\fP or
\fIcurl_multi_perform(3)\fP is called. The protocol set supported by libcurl
vary depending on how it was built. Use \fIcurl_version_info(3)\fP if you need
a list of protocol names supported by the build of libcurl that you are using.

This option does not change the default proxy protocol (http).

Without this option libcurl would make a guess based on the host, see
\fICURLOPT_URL(3)\fP for details.

The application does not have to keep the string around after setting this
option.
.SH DEFAULT
NULL (make a guess based on the host)
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    /* set a URL without a scheme */
    curl_easy_setopt(curl, CURLOPT_URL, "example.com");

    /* set the default protocol (scheme) for schemeless URLs */
    curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");

    /* Perform the request */
    curl_easy_perform(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.45.0
.SH RETURN VALUE
CURLE_OK if the option is supported.

CURLE_OUT_OF_MEMORY if there was insufficient heap space.

CURLE_UNKNOWN_OPTION if the option is not supported.
.SH SEE ALSO
.BR CURLINFO_PROTOCOL (3),
.BR CURLINFO_SCHEME (3),
.BR CURLOPT_URL (3)