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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_POSTFIELDSIZE_LARGE
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_COPYPOSTFIELDS (3)
+  - CURLOPT_POSTFIELDS (3)
+  - CURLOPT_POSTFIELDSIZE (3)
+---
+
+# NAME
+
+CURLOPT_POSTFIELDSIZE_LARGE - size of POST data pointed to
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDSIZE_LARGE,
+                          curl_off_t size);
+~~~
+
+# DESCRIPTION
+
+If you want to post static data to the server without having libcurl do a
+strlen() to measure the data size, this option must be used. When this option
+is used you can post fully binary data, which otherwise is likely to fail. If
+this size is set to -1, libcurl uses strlen() to get the size or relies on the
+CURLOPT_READFUNCTION(3) (if used) to signal the end of data.
+
+# DEFAULT
+
+-1
+
+# PROTOCOLS
+
+HTTP(S)
+
+# EXAMPLE
+
+~~~c
+extern char *large_chunk; /* pointer to somewhere */
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    const char *data = large_chunk;
+    curl_off_t length_of_data; /* set somehow */
+
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+
+    /* size of the POST data */
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, length_of_data);
+
+    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Along with HTTP
+
+# RETURN VALUE
+
+Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.