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---
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title: "Push Gateway API"
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weight: 50
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type: docs
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---
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Clients may want to receive push notifications when events are received
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at the homeserver. This is managed by a distinct entity called the Push
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Gateway.
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## Overview
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A client's homeserver forwards information about received events to the
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push gateway. The gateway then submits a push notification to the push
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notification provider (e.g. APNS, GCM).
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```
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+--------------------+ +-------------------+
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Matrix HTTP | | | |
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Notification Protocol | App Developer | | Device Vendor |
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+-------------------+ | +----------------+ | | +---------------+ |
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| | | | | | | | | |
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| Matrix homeserver +-----> Push Gateway +------> Push Provider | |
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| | | | | | | | | |
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+-^-----------------+ | +----------------+ | | +----+----------+ |
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Matrix | | | | | |
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Client/Server API + | | | | |
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| | +--------------------+ +-------------------+
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| +--+-+ |
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| | <-------------------------------------------+
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+---+ |
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| | Provider Push Protocol
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+----+
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Mobile Device or Client
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```
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## Homeserver behaviour
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This describes the format used by "HTTP" pushers to send notifications
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of events to Push Gateways. If the endpoint returns an HTTP error code,
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the homeserver SHOULD retry for a reasonable amount of time using
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exponential backoff.
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When pushing notifications for events, the homeserver is expected to
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include all of the event-related fields in the `/notify` request. When
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the homeserver is performing a push where the `format` is
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`"event_id_only"`, only the `event_id`, `room_id`, `counts`, and
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`devices` are required to be populated.
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Note that most of the values and behaviour of this endpoint is described
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by the Client-Server API's [Push
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Module](/client-server-api#push-notifications).
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{{push\_notifier\_push\_http\_api}}
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