In my testing of the curl module,before these changes, I didn't get any crashes - perhaps I was lucky.
The crash in utils/http_query (#432) is not related to these changes because the http_query_post_hdr function (which allows passing additional headers, e.g. Content-Type) has not yet been ported to the curl module. If the intention is to obsolete http_query from the utils module, this version of the command needs to be ported.
Fixing the buffer overflow may fix the crash in #400, but that was already fixed in utils (master & 4.3) so no backport is required.

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