$ curl -s -X POST -d 'action=edit&format=json&title=User%3ATgr_(WMF)%2Ftest&appendtext=--%3D%3D+This+is+a+test+%3D%3D--&token=%2B%5C' https://en.wikipedia.org/w/api.php | jq .
{
  "error": {
    "code": "blocked",
    "info": "You have been blocked automatically by MediaWiki.",
    "blockinfo": {
      "blockid": null,
      "blockedby": "MediaWiki default",
      "blockedbyid": 0,
      "blockreason": "__NOEDITSECTION____NOTOC__\n{| id=\"mw-blocked-text\" style=\"border:2px solid #000; width:100%; margin:0 auto 6px auto;\"\n|\n<div style=\"width:100%; margin:auto; text-align:center;\"><div style=\"font-size:180%; color:#ff0000;\"><br>'''You are currently unable to edit Wikipedia.'''</div>\n'''''You are still able to view pages''', but you are not currently able to edit, move, or create them.''\n</div>\n<div style=\"margin:auto; width:70%;\">\n<div style=\"text-align:justify;\">\nEditing from $7 is disabled as it is a [[private IP]] range. This is probably a result of a problem with your Internet connection.\n\nEven if blocked, you will ''usually'' still be able to edit your [[Special:Mytalk|user talk page]] and email other editors and administrators.\n</div>\n</div>\n|}",
      "blockedtimestamp": "2017-02-22T01:54:06Z",
      "blockexpiry": "infinite",
      "systemblocktype": "wgSoftBlockRanges"
    },
    "*": "See https://en.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at &lt;https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce&gt; for notice of API deprecations and breaking changes."
  },
  "servedby": "mw1278"
}

{
   "servedby" : "mw1284",
   "error" : {
      "code" : "blocked",
      "blockinfo" : {
         "blockreason" : "Anonymous contributions are not allowed from your IP address (10.68.23.58). Please log in.",
         "blockedtimestamp" : "2017-02-22T16:40:06Z",
         "blockedby" : "MediaWiki default",
         "systemblocktype" : "wgSoftBlockRanges",
         "blockedbyid" : 0,
         "blockexpiry" : "infinite",
         "blockid" : null
      },
      "*" : "See https://en.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes.",
      "info" : "You have been blocked automatically by MediaWiki."
   }
}