Loading static content in ASP.NET pages from different domain for faster parallel download

re: Loading static content in ASP.NET pages from different domain for faster parallel download

jorge — Fri, 05 Jun 2009 22:39:42 GMT

I cant loud this script

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Rob — Wed, 13 May 2009 07:58:41 GMT

Hi Omar,

What happens if you reference images or css such as <img src="../foo/bar.jpg />

Wouldn't this produce www.mysite.com/../foo/bar.jpg ? notice it has the relative path there

Regards Rob

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Chendur Pandian — Mon, 27 Apr 2009 07:19:51 GMT

Hai omar,

When i use static content filter class ajax clienside frame work failed to load.. Plz reply me to my mail id psc_pandiya@yahoo.co.in

re: Loading static content in ASP.NET pages from different domain for faster parallel download

buddha — Mon, 19 Jan 2009 07:18:30 GMT

hi omar,

ur code seems to good...but i found out some issues with that like when i am calling an ajax method,the images are not getting loaded prop

for that i have added this code also

if (Request.AppRelativeCurrentExecutionFilePath.EndsWith(".aspx") || Request.AppRelativeCurrentExecutionFilePath.EndsWith(".axd"))

i found still the issue exists...am really struck wth this issue

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Paolo Ponzano — Tue, 23 Dec 2008 14:42:26 GMT

Hi Omar... I tryied your filter but as I try to load the page I get 3 errors, the first is

"ASP.NET Ajax client-side framework failed to load."

The page I'm generating is composed of a master page and some usercontrols... one is using ajax toolkit...

Any suggestion?

Thanks in advance

Paolo

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Rakesh Gupta — Thu, 27 Nov 2008 12:45:33 GMT

i have a doubt regarding performance issue of this approach.

we have a page with 20-30 images(small and big),100+ controls( having 2-4 grid with 2-3 images in every rows) and around 200 -300 users are requesting same page at a time.

Regards

Rakesh

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Balaji V — Tue, 23 Sep 2008 10:09:05 GMT

u are my man. great code. fantastic idea and thought process. thanks mate.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

nhm tanveer hossain khan (hasan) — Mon, 15 Sep 2008 23:04:54 GMT

further discussing about why rails routing concept is unique than normal function based approach. i would refer u the following url - guides.rails.info/.../routing_outside_in.html

well, my question is, do you or your team keep the same HTML file which was complied by the designer or design team?

in our company, our designer prefers to submit his work in a single html file, where every visual elements are designed.

so later we separate them in 3 basic files.

1. the layout (which you can call like theme)

2. the action template (which are used with the controller)

3. the fragment template (this is reusable template, which are used from the action template)

as you know, you don't only write url in your view, you do it sometimes in controller as well.

let's say you wants to redirect to a specific URL after performing some action.

i guess in .NET you would do it in 3 ways -

1. writing the hardcoded url ie. Redirect "/url/bla"

2. or using the constant ie. Redirect USER_ACTION_SUCCESS

3. or using the map object ie. Redirect mUrlMapping.get(USER_ACTION);

the later approach has good chance to propagate the fastest change impact, though i believe keeping Map object with the key value pair will provide more flexibility.

but in rails we would write in controller -

redirect_to uesr_my_page_url

so you see, in rails it has less chance of introducing bug with this simple approach.

since human does error we can't say we won't do that. so we rather follow something that can assist us to get away from common errors.

i would say in such a case rails url abstraction with routing is a great option.

thanks bro.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

omar — Mon, 15 Sep 2008 05:45:25 GMT

Using functions to produce URL is a very good concept. If you do it in any platform, whether PHP, JSP, ASP.NET, it solves the problem of making URLs configuration driven. This is not a unique feature of ROR. Every platform already has this support. YOu can do this in PHP, JSP, ASP.NET

Or just use a whole function to produce script tags.

<%= MakeScriptTag('gaga.js', 'text/javascript') %>

However, you can't always make all Javascript, CSS, Images generate from such functions because then you don't get designer support. You cannot have a page full of those functions instead of any image, script or javascript tag and show it nicely on a designer. The designer will simply show garbage. Thus your designer will not be able to design the page at all. Only developers, with ROR installed and has a running project on webserver, can then design the page because they can write such functions and see the result on browser.

The solution I have shown here allows you to keep using traditional html tags and still have the url conversion feature done on-the-fly. You don't need to use any function to generate url, which does not mean you can't, you can always use functions to generate urls for links, images, css and javascripts. But if you are working with a designer, and s/he gives you html snippet without any dynamic code in it, then you use this solution to make things work. Not everyone has the luxury to engage developers do the html designing. There are non-programmer designers who needs to design pages. For them, using dynamic code on the design is a big no no. Moreover, there should be clear separation of design and code. Using functions inline within html hampers that. Then you have dynamic code spread throughout your page where you should have clear separation of static and dynamic code.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

nhm tanveer hossain khan (hasan) — Sun, 14 Sep 2008 23:20:27 GMT

hi bro,

i think my last response is lost. anyway i am writing it again :)

in rails actually we don't write any hardcoded url rather we use named based mapping from routing configuration.

ie. <%= profile_url(@user) %>

this may product - /user/profile/omar

let's say our requirement came up where we are suggested to add locale information with in the url.

so rather changing every consumer code, we put the change on the routing configuration.

so <%= profile_url(@user) %> will now return /en/user/profile/omar

similarly every url are produced through helper function.

for example, if we want to product <script src='..'></script> tag we would use <%= javascript_tag_include ... %> same goes for css, image and others.

more precisely every url are produced by calling "url_for" method.

so you can understand how a simple abstraction can ensure a lot of way to improve it.

actually rails came out with the live product from 37singles. i guess to improve their own product quality they introduced may stuffs, dynamic url configuration is one of them.

as you mentioned - "You don't know how those chocolates are made from"

i doubt it, since we separate developer in two groups, 1. passionate developer, 2. general developer.

so i guess, in my rails team we have a good practice keeping eyes on rails trunk. so we now whats going and how it works.

btw, i think you know about open class concept.

where class can be edited (in scope or none scope). i guess .NET started with class extension support though this is not exactly open class but better in conservative platform.

by default ruby classes are compliant with open class. so you can add your patch or modification or fixes or add new method in any scope of your code base.

so i think, adding sugar is not a big problem at all since ruby is born to enable it :)

thanks for your time and patients.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

omar — Sun, 14 Sep 2008 22:44:18 GMT

The problem with such URL pattern matching is that the entire response needs to be stored in a buffer so that a pattern search, which is most probably a regex search, needs to be performed on the entire response buffer. Moreover, replacing strings in a buffer means more temporary buffers.

Now if you page is producing a 200 KB output, it's storing that entire 200 KB in a buffer and running a regex over 200 KB, which is very slow.

This is why I went great lenths to ensure there's absolutely no buffering of response. The response is processed as every character is written to the stream.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

omar — Sat, 13 Sep 2008 06:31:52 GMT

Interesting, does Rail intercept execution of every dynamic page and automatically parse the content being sent and figure out the image urls and replace them?

If it does, then that's cool. However, there's a problem of having everything nicely packaged into chocolate boxes. You don't know how those chocolates are made from. You just blindly put them on your mouth and enjoy the taste. If it's bitter, you cannot add more sugar to it. You have to live with it. But if you could make the chocolate yourself, you could add as much sugar as you like.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

nhm tanveer hossain khan (hasan) — Fri, 12 Sep 2008 19:13:12 GMT

you know bro, after reading this article i integrated with our rails application.

as i see you had to do a lot of stuffs to enable this feature. but surprising in rails, this option was already bundle with default framework package in a configuration layer.

so i just needed setting the url pattern. now my server is serving image and static content from 4 different asset domains.

so i have 8 connections ready for serving my static contents.

let's check out here http://www.somewhereinads.net

since my server is using ETag properly i don't think i should worry about different domain.

best wishes,

change source to townload from seprate domain / ip

demugger — Sun, 31 Aug 2008 16:09:20 GMT

Greetings to mankind!

What would happen if you changed all your reference uris in the code itself. So instead of

img src="foo.org/img/bar.jpg" or

img src="~/img/bar.jpg"

you could write:

img src="s.foo.org/img/bar.jpg" or even the ip

img src="123.456.789/s.foo.org/img/bar.jpg"

I guess this could be a nightmare for maintenance but i wonder if it is better because this way you do not have to remap every link with the function on Application_BeginRequest - less load on the server

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Bohdan — Mon, 18 Aug 2008 21:44:46 GMT

Can we use regex expression to match src,href attributes Wouldn't it be faster?

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Dilip Kurup — Mon, 11 Aug 2008 11:34:19 GMT

Hi Omar,

I want to display an external Image provided from a URL on my web site asynchronously so that it wont effect my current flow of the site.

Please help me out...

Regards.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

turkey — Sat, 09 Aug 2008 06:49:17 GMT

Thanks for writing all this up! It's nice to have it all figure out. Seems like lots of picky stuff I could get wrong.

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Rainmaker — Tue, 05 Aug 2008 17:30:05 GMT

I found ScriptResource.axd will load twice when postback!

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Yogesh — Tue, 05 Aug 2008 13:51:52 GMT

Can we use regex expression to match src,href attributes Wouldn't it be faster?

re: Loading static content in ASP.NET pages from different domain for faster parallel download

Rainmaker — Tue, 05 Aug 2008 10:59:38 GMT

Sir, when i change tab, it cause

Sys.InvalidOperationException: Type Sys.Timer has already been registered. The type may be defined multiple times or the script file that defines it may have already been loaded. A possible cause is a change of settings during a partial update.

and then cause

Sys.ScriptLoadFailedException: The script 'Dropthings/ScriptResource.axd?d=BXy0sUJnDxvhNpnqhqnaXanryycCjH5Sc9VOYngMd-w6l--Oa0jwVZUimP9aK7tg0ZTgLJtH0Ow89DsNxlRZQg2&t=633475145180000000' failed to load. Check for: Inaccessible path. Script errors. (IE) Enable 'Display a notification about every script error' under advanced settings. Missing call to Sys.Application.notifyScriptLoaded().

Coulde you finger out i should focus where ? Thanks.