lua-cURLv3

Status

This module include three layer

lcurl module provide low level pure C binding to libcurl.
Almost ready and needs tests. I have no plans to change this API.
cURL module provide compatibility for Lua-cURLv2 API.
Almost ready and needs tests.
cURL module provide new high level API.
In fact for now it provide lcurl API directly and needed to redesign.

Original Lua-cURLv2 binding has several problems:

it can not return error codes but just raise Lua errors (Fixed. use cURL.safe module)
it raise Lua error from callback that may result resource leak in libcurl (Fixed.)
it does not provide building multipart/formdata explicitly (Fixed.)
it has memory leak when send multipart/formdata (Fixed.)
it does not save string for curl options that may result crush in libcurl (Fixed.)
there no way to get result for operations in multi interface (e.g. if one of easy operation fail you can not get result code/error message) (Fixed. But it does not very handy interface.)
you can not use your own callback function to perform operation with multi interface (Could not be fixed without changing API.)
you can not pass your context to callback functions (Could not be fixed without changing API.)

objects are tables
multi:perform() also returns (“done”,code), (“error”,error) and (“response”,code) records
writer callback does not recv string len (just string itself)
on Lua > 5.2 errors are objects but not strings