Why does Facebook use long polling instead of WebSocket in order to instant chat?

Facebook may use other connection transports for different applications i.e. their native mobile apps. Facebook use the HTTP Long Polling transport from their web app. The calls to the `pull` resource are each a long-held HTTP request that eventually times out or closes when a response is received.

Is long polling better than WebSockets?

Generally, WebSockets will be the better choice. Long polling is much more resource intensive on servers whereas WebSockets have an extremely lightweight footprint on servers. Long polling also requires many hops between servers and devices.

Does Facebook still use long polling?

1 Answer. Yes “it’s a variation of Comet, specifically XHR long polling, and/or BOSH.”

Does Facebook use WebSockets?

facebook doen’t use websockets directly in any of its products , what it does is long polling , efficiently . websockets offer greater speed. It is real time bidirectional communication . Long polling is faking realtime communication.

Should I use WebSockets for chat?

The answer is also: definitively yes. The proof are benchmarks. A single server can handle easily more than 1000 websocket connections without problem.

Is long polling good?

Long polling is a good solution for small projects, but became a big burden for high scalable apps that need high frecuency and/or very segmented event sending.

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Is long polling bad?

The primary drawback to long-polling is that once the sender has sent data, it cannot send further data until a new poll request arrives. … However, if even that isn’t good enough, say because you’re implementing a fast-paced game, then yes, long-polling is wrong for the job.

Does messenger use MQTT?

Facebook uses MQTT for Messenger Chats. Each “Chat” has a generated Topic, and all members in the Chat subscribe and Publish to that generated Topic. The MQTT Messenger Broker infrastructure is made up of “many” different Brokers, and a “Topic Director” steers the Chat MQTT packets to the Broker handling that chat.

What is long polling?

Long polling is a method that server applications use to hold a client connection until information becomes available. This is often used when a server must call a downstream service to get information and await a result.

Does messenger use WebSocket?

Messenger for Firefox is the first Facebook product to use WebSockets at scale. We rely on our existing chat servers, and added the ability to handle WebSocket connections.

Does Facebook use WebSockets or long polling?

, Developer evangelist at Pusher, a cloud-hosted WebSockets service. Facebook use the HTTP Long Polling transport from their web app. The calls to the `pull` resource are each a long-held HTTP request that eventually times out or closes when a response is received.

Are WebSockets faster than HTTP?

All the frequently updated applications used WebSocket because it is faster than HTTP Connection. When we do not want to retain a connection for a particular amount of time or reusing the single connection for transmitting the data, HTTP connection is slower than the WebSocket..

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Does WhatsApp use WebSockets?

Additionally, Whatsapp uses HTML5 WebSockets which communication technology which facilitates two-way communication.

Are WebSockets dead?

Websockets are largely obsolete because nowadays, if you create a HTTP/2 fetch request, any existing keepalive connection to that server is used, so the overhead that pre-HTTP/2 XHR connections needed is lost and with it the advantage of Websockets.

What protocols does instant messaging use?

Two of the main protocols used for instant messaging in the market today are WebSocket and XMPP.

When should you not use a WebSocket?

Avoid using WebSockets if only a small number of messages will be sent or if the messaging is very infrequent. Unless the client must quickly receive or act upon updates, maintaining the open connection may be an unnecessary waste of resources.

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