Azat Khuzhin 7b077194cc Add new error_cb for actual reporting of HTTP request errors.
It is useful to know why you callback called with NULL (i.e. it failed),
for example if you set max_body with evhttp_connection_set_max_body_size()
you must know that it failed because of body was longer than this size.

 (Commit message tweaked by Nick)
2013-04-25 15:11:44 -04:00
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