For a push notification, is a websocket mandatory?

For a push notification, is a websocket mandatory?

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How to send Extra parameters in payload via Amazon SNS Push Notification

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PHP technique to query the APNs Feedback Server

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Duplicate Apple APNS push notifications?

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HTML5 Notification With PHP

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Sending multiple iPhone push notifications + APNS + PHP

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How do push notifications work?

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Push Notifications for multiple Apps from one server

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C2DM implementation PHP code

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Pushing data to user browser from server

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iOS push notification does not work when using crontab scheduler

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How do I send a HTTP/2 POST request in PHP

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FCM push notification issue: "error":"NotRegistered"

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PHP Apple Enhanced Push Notification read error response

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Android GCM message successfully sent but not received

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