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Network data conversion
Up until libcurl version 7.82.0, these callbacks were provided to make things work on non-ASCII platforms. The support for these callbacks have since been removed.
The documentation below is kept here for a while and describes how they used to work. It will be removed from this book at a future date.
For non-ASCII platforms,
CURLOPT_CONV_FROM_NETWORK_FUNCTIONis provided. This function should convert to host encoding from the network encoding.
CURLOPT_CONV_TO_NETWORK_FUNCTIONshould convert from host encoding to the network encoding. It is used when commands or ASCII data are sent over the network.
CURLOPT_CONV_FROM_UTF8_FUNCTIONshould convert to host encoding from UTF-8 encoding. It is required only for SSL processing.