Other services, such as instant messaging clients, maintain a constant, active connection to the server at all times. When new information is available for the client, the server sends, or " pushes " the information directly to the client as soon as it is available. In corporate environments, mail services such as Microsoft Exchange have paved the way for push email , by having the mail client usually Outlook, Entourage, or other clients that support Exchange maintain an active connection to the mail server, which allows the server to notify the client immediately when new mail arrives.
Read on to find out how Gmail push works, and what you need to know to get it set up on your phone. OK, my iPhone supports push notifications, why can't it do push email? In order for push notifications to work on your iPhone, a few things must happen.
Your phone has to frequently maintain a connection to Apple's servers, so that it can receive notifications when needed. Then the application you are using must register with Apple's servers, letting them know that you wish to receive notifications on your phone for that application or service.
Finally, whenever the service needs to notify you of an event, it has to connect to Apple's servers, and tell them "hey, I have a message for iPhone xyz. Apple, in turn, pushes the message to your phone if it is available.
As you can see, there are a few pieces at work here, and the process isn't perfect. In order for Apple to provide native push notifications for e-mail services, either the email service provider in this case Gmail, but this would apply to any mail provider would have to send Apple a notification with every single email message that was received , or Apple's servers would have to proactively connect to and check email inboxes for every mail account on every iPhone for which push was enabled.
We already know Apple's services are not perfect -- MobileMe email frequently has delivery problems and delays, push notifications don't always go through, and the list goes on. The browser can execute this JavaScript without your page being open.
It can even execute this JavaScript when the browser is closed. A service worker also has API's, like push, that aren't available in the web page i. API's that aren't available out of a service worker script. It's inside the service worker's 'push' event that you can perform any background tasks. You can make analytics calls, cache pages offline and show notifications.
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Updated on April 22, Ryan Perian. Lifewire Technology Review Board Member. Article reviewed on Apr 09, Tweet Share Email. Email Gmail Yahoo! Choose your email client, then enter email address and other pertinent information. Select Automatically in the Fetch section to receive email sent to your account as quickly as possible. Was this page helpful? Thanks for letting us know! Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up.
There was an error. Tell us why! More from Lifewire. If the watch request is successful you will receive a response like:. All changes after that historyId will be notified to your client. If you need to process changes prior to this historyId , refer to the sync guide. You must re-call watch at least every 7 days or else you will stop receiving updates for the user.
We recommend calling watch once per day. The watch response also has an expiration field with the timestamp for the watch expiration. Whenever a mailbox update occurs that matches your watch , your application will receive a notification message describing the change. If you have configured a push subscription, a webhook notification to your server will conform to a PubsubMessage :. That message. You can then use history.
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