.\" generated by cd2nroff 0.1 from CURLINFO_HEADER_SIZE.md
.TH CURLINFO_HEADER_SIZE 3 "2026-09-10" libcurl
.SH NAME
CURLINFO_HEADER_SIZE \- size of response headers
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_HEADER_SIZE, long *sizep);
.fi
.SH DESCRIPTION
Pass a pointer to a long to receive the total size of all the headers
received, represented in HTTP/1\-style header format. Measured in number of
bytes.

The total includes the size of any received headers suppressed by
\fICURLOPT_SUPPRESS_CONNECT_HEADERS(3)\fP.

The number of bytes transferred over the wire (or to the TLS backend) is
different when using HTTP/2 or greater.
.SH PROTOCOLS
This functionality affects all supported protocols
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    result = curl_easy_perform(curl);
    if(result == CURLE_OK) {
      long size;
      result = curl_easy_getinfo(curl, CURLINFO_HEADER_SIZE, &size);
      if(result == CURLE_OK)
        printf("Header size: %ld bytes\\n", size);
    }
    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.4.1
.SH RETURN VALUE
\fIcurl_easy_getinfo(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLINFO_REQUEST_SIZE (3),
.BR CURLINFO_SIZE_DOWNLOAD (3),
.BR curl_easy_getinfo (3),
.BR curl_easy_setopt (3)