Why is the hashtag not being attached in the wall.post method in the VK API?

Question

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Good day to all, comrades. The next question was on the agenda.
The wall.post method works when I just post, but if I try to add a hashtag, the VK API returns an error.
For example, I send a message:
https://api.vk.com/method/wall.post?owner_id={my id}message={TEST MESSAGE
#hashtag}&access_token={token}
Response:
{"error":{"error_code ":5,"error_msg":"User authorization failed: no access_token passed.","request_params":[{"key":"oauth","value":"1"},{"key":"method" ,"value":"wall.post"},{"key":"owner_id","value":"17315390"},{"key":"message",
"value":"TEST MESSAGE \r\n"}]}} Although if you just send the same message, without the hashtag, everything works. What could be the problem?

Answer 1

It is best to pass POST parameters with a request, but if you still want to pass GET parameters with a request, then you need to decode special characters from the message so that they do not violate the integrity of the link.

Answer 2

Encode text, php example:
$message = urlencode($message);