Handle hpost stream abort CURLE_READ_ERROR error code.

Author: moteus

src/lchttppost.c

@@ -44,10 +44,14 @@ static const char *LCURL_HTTPPOST = LCURL_HTTPPOST_NAME;
 # define LCURL_LEN_TYPE long
 #endif
 
-/* 7.56.0 changed code for `curl_formget` if callback abort write 
- * not sure is it bug or not so set only for single version 
+/* 7.56.0 changed code for `curl_formget` if callback abort write.
+ *
+ * https://github.com/curl/curl/issues/1987#issuecomment-336139060
+ * ... not sure its worth the effort to document its return codes to 
+ * any further extent then it currently is. This function is very 
+ * rarely used, and the new mime API doesn't even have a version of it.
  **/
-#if LCURL_CURL_VER_GE(7,56,0) && !LCURL_CURL_VER_GE(7,56,1)
+#if LCURL_CURL_VER_GE(7,56,0)
 #  define LCURL_GET_CB_ERROR CURLE_READ_ERROR
 #else
 #  define LCURL_GET_CB_ERROR (CURLcode)-1

test/test_curl.lua

@@ -20,8 +20,7 @@ local fname      = "./test.download"
 
 local utils = require "utils"
 
--- libcurl 7.56.0 does not add `Content-Type: text/plain`
--- not sure is it bug or not
+-- Bug. libcurl 7.56.0 does not add `Content-Type: text/plain`
 local text_plain = utils.is_curl_eq(7,56,0) and 'test/plain' or 'text/plain'
 
 local GET_URL = "http://127.0.0.1:7090/get"

test/test_form.lua

@@ -14,8 +14,7 @@ local skip       = lunit.skip or function() end
 
 local utils = require "utils"
 
--- libcurl 7.56.0 does not add `Content-Type: text/plain`
--- not sure is it bug or not
+-- Bug. libcurl 7.56.0 does not add `Content-Type: text/plain`
 local text_plain = utils.is_curl_eq(7,56,0) and 'test/plain' or 'text/plain'
 
 local curl      = require "lcurl"