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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: curl_easy_send
+Section: 3
+Source: libcurl
+See-also:
+  - curl_easy_getinfo (3)
+  - curl_easy_perform (3)
+  - curl_easy_recv (3)
+  - curl_easy_setopt (3)
+---
+
+# NAME
+
+curl_easy_send - sends raw data over an "easy" connection
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_send(CURL *curl, const void *buffer,
+                        size_t buflen, size_t *n);
+~~~
+
+# DESCRIPTION
+
+This function sends arbitrary data over the established connection. You may
+use it together with curl_easy_recv(3) to implement custom protocols
+using libcurl. This functionality can be particularly useful if you use
+proxies and/or SSL encryption: libcurl takes care of proxy negotiation and
+connection setup.
+
+**buffer** is a pointer to the data of length **buflen** that you want
+sent. The variable **n** points to receives the number of sent bytes.
+
+To establish the connection, set CURLOPT_CONNECT_ONLY(3) option before
+calling curl_easy_perform(3) or curl_multi_perform(3). Note that
+curl_easy_send(3) does not work on connections that were created without
+this option.
+
+The call returns **CURLE_AGAIN** if it is not possible to send data right now
+- the socket is used in non-blocking mode internally. When **CURLE_AGAIN**
+is returned, use your operating system facilities like *select(2)* to wait
+until the socket is writable. The socket may be obtained using
+curl_easy_getinfo(3) with CURLINFO_ACTIVESOCKET(3).
+
+Furthermore if you wait on the socket and it tells you it is writable,
+curl_easy_send(3) may return **CURLE_AGAIN** if the only data that was sent
+was for internal SSL processing, and no other data could be sent.
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+    /* Do not do the transfer - only connect to host */
+    curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
+    res = curl_easy_perform(curl);
+
+    if(res == CURLE_OK) {
+      long sockfd;
+      size_t sent;
+      /* Extract the socket from the curl handle - we need it for waiting. */
+      res = curl_easy_getinfo(curl, CURLINFO_ACTIVESOCKET, &sockfd);
+
+      /* send data */
+      res = curl_easy_send(curl, "hello", 5, &sent);
+    }
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.18.2.
+
+# RETURN VALUE
+
+On success, returns **CURLE_OK** and stores the number of bytes actually
+sent into ***n**. Note that this may be less than the amount you wanted to
+send.
+
+On failure, returns the appropriate error code.
+
+This function may return **CURLE_AGAIN**. In this case, use your operating
+system facilities to wait until the socket is writable, and retry.
+
+If there is no socket available to use from the previous transfer, this function
+returns **CURLE_UNSUPPORTED_PROTOCOL**.