为什么总是要求fcm不好？

问题描述

我正在尝试使用rest API从FCM向Android客户端发送通知。我的代码是：```

post_offline_message(From,To,Body) ->
    K = "FCM key",U = "https://fcm.googleapis.com/fcm/send",P = #{
      payload => #{
        to => <<"rid">>,priority => <<"high">>,data => #{
          <<"title">> => <<"Some Title">>,<<"message">> => <<"Hi">>
        }
      }
    },EP = jiffy:encode(P),?INFO_MSG("EP data: ~p",[EP]),httpc:set_options([{keep_alive_timeout,0}]),{_,Resp} = httpc:request(post,{U,[{"Authorization","key=" ++ K}],"application/json",EP},[],[]),?INFO_MSG("FCM response: ~p",[Resp]).

My EP data (payload) is this:
**<<"{\"payload\":{\"to\":\"dOqZOggYQZG6xKVY9P4_Xi:APA91bG0kuM-o_lSf3fUaWcyiW0fVj8-L49QgzU6rWfxi3o5lMaKapkOjvvLUxm-e78XS49TVl5jjgQt6DrRKTaDK2xzg-ffm1Qe4Xx-61_Hrmr6I0cPocgAZ9Wv7QgFFjGXtWwWEvSi\",\"priority\":\"high\",\"data\":{\"title\":\"Some Title\",\"message\":\"Hi\"}}}">>** 
and response from FCM is: 
**{{"HTTP/1.1",400,"Bad Request"},[{"cache-control","private,max-age=0"},{"date","Thu,03 Sep 2020 08:57:56 GMT"},{"accept-ranges","none"},{"server","GSE"},{"vary","Accept-Encoding"},{"content-length","3"},{"content-type","text/plain; charset=UTF-8"},{"expires",{"x-content-type-options","nosniff"},{"x-frame-options","SAMEORIGIN"},{"content-security-policy","frame-ancestors 'self'"},{"x-xss-protection","1; mode=block"},{"alt-svc","h3-29=\":443\"; ma=2592000,h3-27=\":443\"; ma=2592000,h3-T051=\":443\"; ma=2592000,h3-T050=\":443\"; ma=2592000,h3-Q050=\":443\"; ma=2592000,h3-Q046=\":443\"; ma=2592000,h3-Q043=\":443\"; ma=2592000,quic=\":443\"; ma=2592000; v=\"46,43\""}],"to\n"}**
Please suggest what I am doing wrong or missing something. I am calling this method from ejabberd hook which is **offline_message_hook**.

解决方法

花费4个小时后，我发现了自己的错误。我只是从请求中删除了有效负载标签，它对我有用。我更新的请求是：

post_offline_message(From,To,Body) ->
    K = "FCM key",U = "https://fcm.googleapis.com/fcm/send",P = #{
        to => <<"rid">>,priority => <<"high">>,data => #{
          <<"title">> => <<"Some Title">>,<<"message">> => <<"Hi">>
        }
    },EP = jiffy:encode(P),?INFO_MSG("EP data: ~p",[EP]),httpc:set_options([{keep_alive_timeout,0}]),{_,Resp} = httpc:request(post,{U,[{"Authorization","key=" ++ K}],"application/json",EP},[],[]),?INFO_MSG("FCM response: ~p",[Resp]).