When LinkedIn throws HTTP result code 999 at you it means it does not like you
Posted by jpluimers on 2019/10/23
LinkedIn is very private about itself which means you have a hard time linking to their content.
Too bad, as they make themselves an island.
I sorted this out a while ago to see why the Press-This and other bookmarking functionalities in web-browsers would fail for LinkedIn:
[WayBack] WordPress/press-this: Linked-In URLs do not parse correctly
@kraftbj I found the below ones on StackOverflow and a general sentiment from https://www.google.com/search?q=linkedin%20999%20response is “Using the invalid HTTP response 999, LinkedIn blocks vary over time depending on both UserAgent and IP address blocks including many hosting and cloud service providers”.
–jeroen
The Wiert Corner - irregular stream of stuff 
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