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Sends raw data over a connection.

Component Version macOS Windows Linux Server iOS SDK
CURL 7.2 ✅ Yes ✅ Yes ✅ Yes ✅ Yes ✅ Yes
MBS( "CURL.SendData"; curl; Data { ; DataType } )   More


Parameter Description Example Flags
curl The CURL session handle. $curl
Data The data to send.
Can be hex or base64 encoded text.
DataType The data type to send.
Can be Hex or Base64. Default is hex.
"hex" Optional


Returns OK or error.


Sends raw data over a connection.
This function sends arbitrary data over the established connection. You may use it together with ReceiveData 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.

Provide the data to send via parameter. We return the number of bytes sent.

To establish the connection, use CURL.SetOptionConnectOnly with value 1 before calling CURL.Perform function. Note that SendData will not work on connections that were created without this option.

The call will return empty and set error to CURLE_AGAIN (81) if it's not possible to send data right now - the socket is used in non-blocking mode internally. When CURLE_AGAIN is returned, please wait.

Furthermore if you wait on the socket and it tells you it's writable, SendData may return CURLE_AGAIN if the only data that was sent was for internal SSL processing, and no other data could be sent.

Please use CURL.ErrorCode to query error after you used this function.
See also CURL.ReceiveData function to receive data and CURL.SetOptionConnectOnly to connect only and use these functions.

See also

Release notes

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This function checks for a license.

Created 27th March 2017, last changed 11st May 2020

CURL.RunningTransfers - CURL.SendText