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56 lines
1.6 KiB
Groff
56 lines
1.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_HEADER.md
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.TH CURLOPT_HEADER 3 "2024-08-02" libcurl
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.SH NAME
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CURLOPT_HEADER \- pass headers to the data stream
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADER, long onoff);
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.fi
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.SH DESCRIPTION
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Pass the long value \fIonoff\fP set to 1 to ask libcurl to include the headers
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in the write callback (\fICURLOPT_WRITEFUNCTION(3)\fP). This option is
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relevant for protocols that actually have headers or other meta\-data (like
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HTTP and FTP).
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When asking to get the headers passed to the same callback as the body, it is
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not possible to accurately separate them again without detailed knowledge
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about the protocol in use.
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Further: the \fICURLOPT_WRITEFUNCTION(3)\fP callback is limited to only ever
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get a maximum of \fICURL_MAX_WRITE_SIZE\fP bytes passed to it (16KB), while a
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header can be longer and the \fICURLOPT_HEADERFUNCTION(3)\fP supports getting
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called with headers up to \fICURL_MAX_HTTP_HEADER\fP bytes big (100KB).
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It is often better to use \fICURLOPT_HEADERFUNCTION(3)\fP to get the header
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data separately.
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While named confusingly similar, \fICURLOPT_HTTPHEADER(3)\fP is used to set
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custom HTTP headers!
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.SH DEFAULT
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0
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.SH PROTOCOLS
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This functionality affects ftp, http, imap, pop3 and smtp
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in curl 7.1
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.SH RETURN VALUE
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Returns CURLE_OK.
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.SH SEE ALSO
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.BR CURLOPT_HEADERFUNCTION (3),
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.BR CURLOPT_HTTPHEADER (3)
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