What is the difference between Forever-frame and server sent events? -

-

this question similar question:what difference between web sockets, long polling, server-sent events , forever frame?

however, question's answer doesn't mention difference between sse , forever-frame.
let me give brief explanation them.

regarding sse, system resembles comet, point different comet not breaking connection after data being sent. so, connection server client long-alive , client receives series of fragments of whole data.

on other hand, forever frame seems similar me. in forever frame, first client receives page including iframe tag, establishing long-lived connection inside hidden iframe. , client receives chunked datas server , manipulates dom functions on first document client has.

i assume difference forever-frame uses iframe tag in mechanism, sse doesn't , sse can realized more ways. right?

i'd not heard of forever-frame name before! (it covered in ch.7 of book, data push apps html5 sse, in "iframe" section).

long-polling: make request (using xmlhttprequest, i.e. ajax), keep open until data ready on server. socket closes. re-connect next bit of data.

xhr polling: make request (using xmlhttprequest2, i.e. ajax), listen in readystate==3 signals. back-end server has know keep connection open, , client has know listen readystate==3. (does not work in ie9 , earlier, because browser never delivers readystate==3 messages, goes straight readystate==4)

iframe: open hidden iframe back-end process. regularly go @ source code of iframe, , see if new there. (technically works on browsers, ie8 , ie9 ones in (2013) tests low enough latency updates useful.)

sse: html5 standard works xhr polling (firefox , chrome, @ least, implement directly on top of xmlhttprequest2), complex details hidden you. adds auto-reconnect if socket goes down, , few other high-level features that.

at end of chapter 7 of afore-mentioned book, show code techniques work in browser. order of preference is:

  • sse if available
  • else xhr if available
  • else iframe if ie8 or ie9
  • else longpoll

there 1 other difference: xhr , iframe techniques storing entire message history in memory. so, if intend keep socket open long time and/or send lot of large messages, may cause memory issue wouldn't happen sse.

executive summary: don't worry "forever-frame" unless have enough customers still using ie8/ie9 longpoll approach create noticeable additional load on infrastructure.


Comments

Post a Comment

Popular posts from this blog

php - How to display all orders for a single product showing the most recent first? Woocommerce -

-
i have password protected page on frontend. on page, want display full list of purchases associated single woocommerce product id. option 1: i've looked through woocommerce docs , , found: wc_cli_order , list_( $args, $assoc_args ) function lists orders. presumably, orders can filtered product id [--=] filter orders based on order property. line item fields (numeric array, started index zero): line_items.0.product_id option 2: i found article , based on customer id. i've modified code based on guesses meta_key , meta_value. $customer_orders = get_posts( array( 'numberposts' => -1, 'meta_key' => '_product', 'meta_value' => get_product_id(), 'post_type' => wc_get_order_types(), 'post_status' => array_keys( wc_get_order_statuses() ), ) ); how display orders single product showing recent order first? here solution put based on these articles: http://www.w...
Read more

asp.net - How to correctly use QUERY_STRING in ISAPI rewrite? -

-
i'm having difficult time , hope guys can help. using helicon isapi rewrite version 3.1.0.104 on our iis server. edit http.conf file , have tried , still fail. this trying do: redirect url: https://www.domain.com/switch-by-version?version=2.8.5.2594 to: https://test.domain.com/load/load.aspx?tver=2.8.5.2594 the version number @ end source url change, , need target url have same version number @ end of url example above shows. i tried following not work: rewritecond %{query_string} ^version=(\d\d?)\.(\d\d?)\.(\d\d?)\.(.*)$ [nc] rewriterule ^/switch-by-version(.*)$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l] any appreciated! thanks. if it's running in equivalent context of .htaccess , rule shouldn't start / . here's simpler version: rewritecond %{query_string} ^version=(\d+\.\d+\.\d+(?:\..+)?)$ [nc] rewriterule ^switch-by-version/?$ https://test.domain.com/load/load.aspx?tver=%1 [r=307,nc,l]
Read more

angularjs - How restrict admin panel using in backend laravel and admin panel on angular? -

-
https://scotch.io/tutorials/token-based-authentication-for-angularjs-and-laravel-apps following tutorials, try write authentication restrict admin panel, didn't understood how can that. this admin panel, admin panel don't want show , request database unauthenticated users. my laravel-routes route::get('/admin',function(){ return view('index'); }); route::get('/api/v1/employees/{id?}', 'employees@index'); route::get('/api/v1/users/{id?}', 'employees@users'); route::post('/api/v1/employees', 'employees@store'); route::post('/api/v1/employees/{id}', 'employees@update'); route::delete('/api/v1/employees/{id}', 'employees@destroy'); route::group(['prefix' => 'api'], function() { route::resource('authenticate', 'authenticatecontroller', ['only' => ['index']]); route::post('authenticate', 'authentic...
Read more