概要

Non-secure network connections disabled in Player Settings
System.Reflection.MethodBase:Invoke (object,object[])
Google.PortableWebRequest:StartRequest (Google.PortableWebRequest/HttpMethod,string,System.Collections.Generic.IDictionary`2<string, string>,UnityEngine.WWWForm) (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/PortableWebRequest.cs:508)
Google.PortableWebRequest/<StartRequestOnMainThread>c__AnonStorey0:<>m__0 () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/PortableWebRequest.cs:458)
Google.RunOnMainThread:ExecuteNext () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:486)
Google.RunOnMainThread:<ExecuteAllUnnested>m__1 () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:536)
Google.RunOnMainThread:RunAction (System.Action) (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:343)
Google.RunOnMainThread:ExecuteAllUnnested (bool) (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:530)
Google.RunOnMainThread:ExecuteAll () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:512)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

Job failed with exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Insecure connection not allowed
  at (wrapper managed-to-native) UnityEngine.Networking.UnityWebRequest.BeginWebRequest(UnityEngine.Networking.UnityWebRequest)
  at UnityEngine.Networking.UnityWebRequest.SendWebRequest () [0x00001] in /Users/bokken/buildslave/unity/build/Modules/UnityWebRequest/Public/UnityWebRequest.bindings.cs:288 
  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <381999f96ea944d79e461a81dcbea654>:0 
   --- End of inner exception stack trace ---
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00083] in <381999f96ea944d79e461a81dcbea654>:0 
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <381999f96ea944d79e461a81dcbea654>:0 
  at Google.PortableWebRequest.StartRequest (Google.PortableWebRequest+HttpMethod method, System.String url, System.Collections.Generic.IDictionary`2[TKey,TValue] headers, UnityEngine.WWWForm form) [0x0019d] in Z:\tmp\tmp.MI6gIp8Q3C\third_party\unity\unity_jar_resolver\source\VersionHandlerImpl\src\PortableWebRequest.cs:508 
  at Google.PortableWebRequest+<StartRequestOnMainThread>c__AnonStorey0.<>m__0 () [0x00000] in Z:\tmp\tmp.MI6gIp8Q3C\third_party\unity\unity_jar_resolver\source\VersionHandlerImpl\src\PortableWebRequest.cs:458 
  at Google.RunOnMainThread.ExecuteNext () [0x0003d] in Z:\tmp\tmp.MI6gIp8Q3C\third_party\unity\unity_jar_resolver\source\VersionHandlerImpl\src\RunOnMainThread.cs:486 
UnityEngine.Debug:LogError (object)
Google.RunOnMainThread:ExecuteNext () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:488)
Google.RunOnMainThread:<ExecuteAllUnnested>m__1 () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:536)
Google.RunOnMainThread:RunAction (System.Action) (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:343)
Google.RunOnMainThread:ExecuteAllUnnested (bool) (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:530)
Google.RunOnMainThread:ExecuteAll () (at Z:/tmp/tmp.MI6gIp8Q3C/third_party/unity/unity_jar_resolver/source/VersionHandlerImpl/src/RunOnMainThread.cs:512)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions () (at /Users/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:359)

Firebase を導入したプロジェクトで上記の警告やエラーが発生する場合の対処方法