как в ajax сделать такой запрос
POST [url]https://site.ru/api.phtml?SERVER_OPEN_CHAT[/url] HTTP/1.1
Host: site.ru
Connection: keep-alive
Content-Length: 489
Origin: [url]https://site.ru[/url]
X-Desktop-web: 1
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36
Content-Type: json
X-Session-id: q1f73de13b38a456d8ac101a93ae7722e
X-Message-type: 102
X-User-id: 609580306
Accept: */*
Referer: [url]https://site.ru/profile/0497539656[/url]
Accept-Encoding: gzip, deflate, br
Accept-Language: ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7
Cookie: device_id=9ce4de52-de52-52b8-b81e-1e42338205a2; pid=1; has_secure_session=1; aid=609580306; s1=q1f73de13b38a456d8ac101a93ae7722e; cpc=%7B%22c%22%3A1%2C%22e%22%3A1831718868467%2C%22d%22%3A%22eu1.site.ru%22%2C%22u%22%3A%22609580306%22%7D; _ga=GA1.2.1759571023.1518422466; fbm_107433747809=base_domain=.site.ru
{"version":1,"message_type":102,"message_id":21,"body":[{"message_type":102,"server_open_chat":{"user_field_filter":{"projection":[330,331,200,700,580,640,600,610,250,340,280,290,291,310,301,302,680,303,304,210,230,731,650,570,280],"profile_photo_size":{"square_face_photo_size":{"width":300,"height":300}}},"initial_screen_user_field_filter":{"projection":[410,490,471,800,550,560,580],"united_friends_filter":[{"section_type":1}]},"chat_instance_id":"585971404"}}],"is_background":false}
пример запроса пожалуйста