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82 lines
3.0 KiB
Groff
82 lines
3.0 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_POST.md
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.TH CURLOPT_POST 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_POST \- make an HTTP POST
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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_POST, long post);
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.fi
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.SH DESCRIPTION
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A parameter set to 1 tells libcurl to do a regular HTTP post. This also makes
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libcurl use a "Content\-Type: application/x\-www\-form\-urlencoded" header. This
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is the most commonly used POST method.
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Use one of \fICURLOPT_POSTFIELDS(3)\fP or \fICURLOPT_COPYPOSTFIELDS(3)\fP
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options to specify what data to post and \fICURLOPT_POSTFIELDSIZE(3)\fP or
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\fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP to set the data size.
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Optionally, you can provide data to POST using the
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\fICURLOPT_READFUNCTION(3)\fP and \fICURLOPT_READDATA(3)\fP options but then
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you must make sure to not set \fICURLOPT_POSTFIELDS(3)\fP to anything but
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NULL. When providing data with a callback, you must transmit it using chunked
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transfer\-encoding or you must set the size of the data with the
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\fICURLOPT_POSTFIELDSIZE(3)\fP or \fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP
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options. To enable chunked encoding, you simply pass in the appropriate
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Transfer\-Encoding header, see the post\-callback.c example.
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You can override the default POST Content\-Type: header by setting your own
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with \fICURLOPT_HTTPHEADER(3)\fP.
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Using POST with HTTP 1.1 implies the use of a "Expect: 100\-continue" header.
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You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
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If you use POST to an HTTP 1.1 server, you can send data without knowing the
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size before starting the POST if you use chunked encoding. You enable this by
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adding a header like "Transfer\-Encoding: chunked" with
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\fICURLOPT_HTTPHEADER(3)\fP. With HTTP 1.0 or without chunked transfer, you
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must specify the size in the request. (Since 7.66.0, libcurl automatically
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uses chunked encoding for POSTs if the size is unknown.)
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When setting \fICURLOPT_POST(3)\fP to 1, libcurl automatically sets
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\fICURLOPT_NOBODY(3)\fP and \fICURLOPT_HTTPGET(3)\fP to 0.
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If you issue a POST request and then want to make a HEAD or GET using the same
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reused handle, you must explicitly set the new request type using
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\fICURLOPT_NOBODY(3)\fP or \fICURLOPT_HTTPGET(3)\fP or similar.
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When setting \fICURLOPT_POST(3)\fP to 0, libcurl resets the request type to the
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default to disable the POST. Typically that means gets reset to GET. Instead
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you should set a new request type explicitly as described above.
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.SH DEFAULT
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0, disabled
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.SH PROTOCOLS
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HTTP
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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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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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curl_easy_setopt(curl, CURLOPT_POST, 1L);
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/* set up the read callback with CURLOPT_READFUNCTION */
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Along with HTTP
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.SH RETURN VALUE
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Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH SEE ALSO
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.BR CURLOPT_HTTPPOST (3),
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.BR CURLOPT_POSTFIELDS (3),
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.BR CURLOPT_PUT (3)
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