# curl_easy_send

Definition: | include builtins\libcurl.e {CURLcode res, integer len} = curl_easy_send(atom curl, object buffer, integer buflen=length(buffer))
Description: | Send raw data over an "easy" connection. This function sends arbitrary data over the established connection. You may use it together with curl_easy_recv to implement custom protocols using libcurl. This functionality can be particularly useful if you use proxies and/or SSL encryption: libcurl will take care of proxy negotiation and connection set-up. buffer can be a string, in which case buflen is defaulted as above, or a memory pointer in which case buflen must be explicitly provided. A result code and the number of sent bytes will be returned. Return value: On success, returns CURLE_OK and the number of bytes actually sent. Note that this may very well be less than the amount you wanted to send. On failure, returns the appropriate error code as the first element of the result.
pwa/p2js: | Not supported.
Comments: | To establish the connection, set CURLOPT_CONNECT_ONLY option before calling curl_easy_perform or curl_multi_perform. Note that curl_easy_send will not work on connections that were created without this option. The call will return CURLE_AGAIN if it’s 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 with CURLINFO_ACTIVESOCKET. Furthermore if you wait on the socket and it tells you it’s writable, curl_easy_send may return CURLE_AGAIN if the only data that was sent was for internal SSL processing, and no other data could be sent. Availability: Added in 7.18.2. 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.
See Also: | curl_easy_setopt, curl_easy_perform, curl_easy_getinfo, curl_easy_recv