Unexplained Performance Drop Resulting In HTTP 413?
May 11, 2010
I was trying to tweak the web.config file for a web app my company uses to both improve the file's legibility as well as tweak performance and strictness of compilation and ended up making my normally wonderfully-running web app (seemingly start ignoring the UpdatePanels on the page, but mainly) start instantly showing this error upon clicking any web control:The page was not displayed because the request entity is too large.I searched on Google and now know this is an HTTP 413 error, but I have no idea what part of the web.config file I edited that caused this regression. Need to fix quick, as the site is already in production.
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Mar 30, 2011
Our site was under Slow HTTP POST DOS attack recently. It's when your server receives a lot of incoming connections and keep them for long time because the sender sends information very slow and server cant serve real users' request - denial of service.
So I decied to reject such POST requests:
void Application_BeginRequest(object sender, EventArgs e)
{
if ( _my_condition_here_ )
{
_reject_the_request_by_dropping_connection_
}
}
The problem is that I can't drop the HTTP connection in asp.net:
Response.End(), throw new Exception(), even Thread.CurrentThread.Abort()
don't close the connection. It waits while sender sends all the fake data, then answer to it with '500 server error' or something. The slow POST attack still will be successful in this case.
How can I just drop the connection?
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Feb 8, 2010
Basically, I'm lookuing to get some performance feedback and peoples thought about speeding up performance of my cascading drop down boxes.
Current;y I'm using a acces.db on the backend to populate the date.
It's just non populating for what I think is fast enough.
Would it be faster if I put the data in a real database? mssql, mysql, etc...
I wouldn't think it was my code, It's not even that many lines.
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Jan 26, 2010
I have a troublesome problem which I'm at a loss to explain. To put it simply, the CPU use is inexplicably high on the web servers in my web farm.I have a large number of users hitting two front-end web servers. 99% of the page loads are Ajax requests and serve a simple JSON-serialized object which the web servers retrieve from a backend using WCF. In the typical case (again, probably 99% of the requests), all the ASPX page is doing is making a WCF call to get this data, serializing it into a JSON string and returning it.
The object is pretty small-- a guid, a couple short strings, a few ints.The non-typical case is the initial page load, which does the same thing (WCF request) but injects the response into different parts of the page using asp:literals.
All three machines (2 web servers, one backend) have the same hardward specs. I would expect the backend to do the majority of the work in this situation, since it's managing all the data, doing the lookups, etc. BUT: the load on the backend is much less than the load on the front ends. The backend is a nice, level 10-20% CPU load. The front ends run an average of 30%, but they're all over the map, sometimes hitting spikes of 100% for 10 seconds and taking 600ms to serve these very simple pages.When I run the front-end in profiler (ANTS), it flags the WCF communication as taking 80% of the CPU time. That's the whole call on the .NET-generated WCF proxy.
WCF Setup: the service is fully parallel. I have instancing set to "single" and concurrency set to "multiple". I opened up the maxConnections and listenBacklog on the service to 256. Under heavy strain (500 requests/s) I see about 75 connections open between both front-end servers and the service, so it's not hitting that wall. I have security set to 'none' all around. Bandwidth use is about 1/20th of the potential (4Mb/s on a 100Mb/s network).
On the client (the web servers), I create a static ChannelFactory for the service. Code to call the service looks like:
service = MyChannelFactory.CreateChannel();
try {
service.Call();[code]....
What I don't understand is where all this load on the front end is coming from. What's strange about it is that it's never in the 30%-90% range. It's either in panic mode (100%) or doing OK (30% or less). Given the load on the backend, though, I'd expect both of these machines to be 10% or less. Memory use, handles, etc., all seem reasonable.
To add one more wrinkle: when I log how long it takes to service these calls on the backend, I get times consistently less than 15ms (maybe one or two spikes to 30ms every minute). On the front end, these calls can take up to 1s to return. I guess that could be because of the CPU problems, but it seems off to me. where to look on this kind of thing? I'm running short on things to explore.
Clarification: The WCF service is hosted in a Windows service, and is using a netTcp binding. Also, I have the maxConnections on the client set to 128, FWIW.
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Jul 18, 2010
I have been messing around with uploading working with and then saving a resulting image.
However at the moment im getting errors in the outputted image, even with very simple code which takes the filebase, puts it into an image object then saves it back out.
Also i would like to know if there is a method in MVC to check the file extension or somehow determine wether it is an image file.
Here is my code:
[Code]....
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May 6, 2010
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I have verified these responses by using Microsoft Network Monitor,Fiddler and Firebug. Also these entries are present in IIS logs. I tried to implement the same with a script service but that too gives same issues. Our site has lots of ajax features and controls and everything is working fine, only this issue is there.
<asp:ScriptManager ID="smHome" runat="server" EnablePageMethods="true" AsyncPostBackTimeout="600"> </asp:ScriptManager>
<CustomControls:StyledAutoCompleteExtender runat="server" ID="acAssociateSmartSearch"
TargetControlID="txtSmartSrch" ServiceMethod="GetAssociateSmartSearchList" MinimumPrefixLength="2"
CompletionListCssClass="sscompletionListElement" CompletionListItemCssClass="sslistItem"
CompletionListHighlightedItemCssClass="sshighlightedListItem" CompletionSetCount="10"
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Sep 10, 2010
I'm reading about the UpdatePanel and how it interacts with controls inside & outside of it.
My understanding is that the usual ASP.Net pipeline takes place when posting from within an UpdatePanel-- Page load etc all fire off as normal-- except when the prerendering stage is reached. In that case the ScriptManager does a final check and only renders those controls within the UpdatePanel and skips the rest. That's my understanding at least.
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Apr 23, 2013
I have article.aspx page that there is some Textboxs and fileupload control and insert when users click on btnInsert their data insert into database below is Behind code
protected void btnInsert_Click1(object sender, ImageClickEventArgs e)
{
string path = Server.MapPath(".") + "../image/House/article/pdf";
string filename = System.IO.Path.GetFileName(fuppdf.PostedFile.FileName);
string[] validext = { ".pdf" };
string ext = System.IO.Path.GetExtension(fuppdf.PostedFile.FileName);
if (Array.IndexOf(validext, ext.ToLower()) < 0)
[code]....
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Sep 20, 2010
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Apr 29, 2010
I am not sure if this is the right forum. I can not find a forum for LINQ.
I am working on an application using LINQ. Application performance is not up to par and my tests show that it is LINQ queries that are slow. I was wondering if anybody can recommend where I can find an article about optimizing LINQ performance maybe by compilation or other methods.
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Jan 28, 2011
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error
statusCode="500"
redirect="/errors/errorpage.aspx?error=500"
/>
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Mar 12, 2010
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Jan 4, 2011
Background:
We are using the Facebook API and receive back URLs for profile image thumbnails. Unfortunately the protocol is restricted to just HTTP and it doesn't support HTTPS. The page on our site that hosts the thumbnails is always delivered via HTTPS, and if we use HTTP for the thumbnails the user will receive security warnings from their browser.
Solution:
Build an HTTP Handler that "passes through" the image from the Facebook URL, but allow the handler to be called via HTTPS. Before I started coding I thought I could something like this:
Response.OutputStream = WebRequest.Create(FacebookUrlForThumbnail)
but I ended up having to save the image to an object in memory than write the image to the Response.OutputStream using the image save function.
Current Code:
[Code]....
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Jan 20, 2010
clear my concept What is HTTP module and HTTP Handler and how does they work while page requesting???
How authentication and Authorization process work in asp.net?
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Mar 4, 2011
I mean what is their use . . .
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Aug 26, 2010
what is doffrence between http://domain.com & http://www.domain.com where domain is the same name in both of this.e.g. http://mycompany.com & http://www.mycompany.comi
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May 20, 2010
I am working on an ASP.NET 3.5, C#, ASP.NET AJAX, JQUERY web application which currently is having some performance issues. I have a screen with the forms view control and when I edit the form and save it for the first time the POST takes 4.89 seconds and when I perform the same operation again for the second time the POST only takes 1.09 seconds. What could be the reason for this strange behavior?
Note: I am using firebug and I am disregarding the page resources (like js, images) load time.
EDIT: I am using the Web Deployment Project to precompile the application.
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