I have an asp.net mvc website hosted on Windows Server 2012r2 Standard which uses KnockoutJS to display data in a grid. This server is dedicated to the process that I'm having trouble with - it does not server any other requests.
An ajax call is made to a "GetRecords" action of a controller. This returns data for a couple of dozen records very quickly.
The user is able to make amendments to the data and submit for update. The knockout code makes another ajax call, this time posting the records. At this point the site "hangs" for a long time (over 10 minutes), but it does complete successfully and the updated date is persisted to a database. During the "hang time" the CPU for the IIS Worker Processes hovers around the 50% mark.
I'm trying to figure out what's causing the delay. It seems that the delay happens before the first line of code of the controller action is reached. I've added trace statements to the action and I can see that once the 1st line is executed, then the action completes within a couple of seconds.
From the IIS manager, I've drilled in to "Worker Processes"\"Current Requests" during the time the page is "hung", I can see that the State is listed as "ExecuteRequestHandler" and the Module Name is "ManagedPipelineHandler". There are no other "Current Requests" displayed.
Using the Chrome dev tools, I've captured the json being posted for the update, it is approx 4mb in size.
I've ruled out the problem being caused by bandwidth because I've tested from a browser running locally (on the web server), and I get the same delay.
Also, when I post the same number of records on the same site hosted on my dev VM then it works fine - completes end-to-end in under 3 seconds.
Any suggestion on steps I can take to improve performance of the post?
I have created a process dump of the IIS worker process when it is in the "hanging" state, this is available at: onedrive link
It seems that "Thread 28" is causing the issue, since this has a "Time spent in user mode" value of over 2 minutes. I requested the process dump about 2 minutes after making the http post request from the website. The post did eventually complete ok after about 20 minutes
Able to work around this problem bypassing the MVC model binding. The view model param (editBatchVm) that was passed into the controller method has been replaced. So, instead of:
public void ResubmitRejectedVouchersAsNewBatch(EditBatchViewModel editBatchVm)
{
I now have:
public void ResubmitRejectedVouchersAsNewBatch()
{
string requestData = "";
using (var reader = new StreamReader(Request.InputStream))
{
requestData = reader.ReadToEnd();
}
EditBatchViewModel editBatchVm = JsonConvert.DeserializeObject<EditBatchViewModel>(requestData);
Related
Environment
.NET Core 5 Web Application
IIS 10
Azure VM
Issue
Executing a GET action results in that action being called a second time. The first call shows cookie information. The second does not show cookie information.
What we've tried:
Occurs for GET requests but not POST requests
Occurs without a view (NOT a javascript issue)
Browser does not show two requests. This occurs server-side.
Does not occur in Firefox Privacy Mode
Does not occur on localhost. Only in production.
Occurs with HTTPS off
Fork of the solution does not exhibit this behavior (makes middleware unlikely cause)
Best guesses:
.NET 5 (deprecated) or dependencies (a bad developer blames his tools)
IIS Settings
Session
Code example:
Controller
// no other filters
[HttpGet]
public IActionResult DupeRequestTest()
{
// database insert with Dapper
var sql = #"INSERT INTO TrackingTable
(CookieJson, CreateDate)
VALUES(#CookieJson, GETDATE());";
using var con = new SqlConnection(_connectionString);
con.Open();
con.Execute(sql, new
{
CookieJson=JsonConvert.SerializeObject(Request.Cookies),
});
// returning a status code so no View, javascript, or other requests
return StatusCode(200);
}
Database results:
CookieJson
CreateDate
[{"Key":"SessionId","Value":"ac6f292c-1ca1-5179-9123-78a04d382dea"}]
2022-10-25 09:46:30.523
[]
2022-10-25 09:46:30.770
Thank you. Any help, such as next testing steps, would be appreciated - short of building a new app.
I'm sure the answer is either very stupid or very hidden.
I have an ASP.NET Core MVC application hosted on Google Compute Engine, and when I check the logs, it seems that www.mysite.com/home/index is constantly being requested even though I am not searching that URL in my browser and nobody else knows the actual URL. Why is this? I am concerned that it may be interfering with some of my processes.
I am running the app on Windows Server 2016 and I often Remote Desktop into it. Could either of these be the reason behind the logs I am getting?
{"#t":"2019-01-01T09:37:24.4301536Z","#m":"Request starting HTTP/1.1 GET http://10.142.0.4/ ","#i":"ca22a1cb","Protocol":"HTTP/1.1","Method":"GET","ContentType":null,"ContentLength":null,"Scheme":"http","Host":"10.142.0.4","PathBase":"","Path":"/","QueryString":"","HostingRequestStartingLog":"Request starting HTTP/1.1 GET http://10.142.0.4/ ","EventId":{"Id":1},"SourceContext":"Microsoft.AspNetCore.Hosting.Internal.WebHost","RequestId":"0HLJFPIU5NJ9V:00000001","RequestPath":"/","CorrelationId":null,"ConnectionId":"0HLJFPIU5NJ9V"}
{"#t":"2019-01-01T09:37:24.5299320Z","#m":"Route matched with \"{action = \\\"Index\\\", controller = \\\"Home\\\"}\". Executing action \"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)\"","#i":"a44c0341","RouteData":"{action = \"Index\", controller = \"Home\"}","ActionName":"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)","EventId":{"Id":1},"SourceContext":"Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker","ActionId":"dc996f72-2933-4b90-9a5e-ccbfe11d91ba","RequestId":"0HLJFPIU5NJ9V:00000001","RequestPath":"/","CorrelationId":null,"ConnectionId":"0HLJFPIU5NJ9V"}
{"#t":"2019-01-01T09:37:24.5405482Z","#m":"Executing action method \"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)\" - Validation state: Valid","#i":"dad538d7","ActionName":"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)","ValidationState":"Valid","EventId":{"Id":1},"SourceContext":"Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker","ActionId":"dc996f72-2933-4b90-9a5e-ccbfe11d91ba","RequestId":"0HLJFPIU5NJ9V:00000001","RequestPath":"/","CorrelationId":null,"ConnectionId":"0HLJFPIU5NJ9V"}
{"#t":"2019-01-01T09:37:24.5441766Z","#m":"Executed action method \"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)\", returned result \"Microsoft.AspNetCore.Mvc.ViewResult\" in 0.4835ms.","#i":"50a9e262","ActionName":"TelebotApplication.Controllers.HomeController.Index (TelebotApplication)","ActionResult":"Microsoft.AspNetCore.Mvc.ViewResult","ElapsedMilliseconds":0.48350000000000004,"EventId":{"Id":2},"SourceContext":"Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker","ActionId":"dc996f72-2933-4b90-9a5e-ccbfe11d91ba","RequestId":"0HLJFPIU5NJ9V:00000001","RequestPath":"/","CorrelationId":null,"ConnectionId":"0HLJFPIU5NJ9V"}
This seems to pretty much repeat itself endlessly.
Thanks
when I check the logs, it seems that www.mysite.com/home/index is constantly being requested even though I am not searching that URL in my browser and nobody else knows the actual URL
For this issue, it is caused by Health checking you configured in the GCP.
The issue I am facing, is occassionally, public static void
Main(string[] args) is re-entered without my instruction.
For this issue, it is usually caused by the application recycling. Exceptions in request would not make application recycling.
I am developing a web application with Mojolicious. The morbo development server is a wonderful thing that works great, but once I start returning complicated hashes on the stack and then rendering a webpage, the morbo server will start to act funny. In my browser, if I navigate to one of those webpages that use a complicated hash, the browser will tell me that the connection has been reset. I have to refresh about 10-12 times before the page will load.
For example:
The code below shows one of my app controllers. It simply gets a json object from an AJAX request, and then returns a different json object. It works fine, except that the browser demands to be refreshed a thousand times before it will load.
package MyApp::Controller::Library;
use Mojo::Base 'Mojolicious::Controller';
use Mojo::Asset::File;
use MyApp::Model::Generate;
use MyApp::Model::Database;
use MyApp::Model::IpDatabase;
use Mojo::JSON qw(decode_json);
# Receives a json object from an AJAX request and
# sends the necessary information back to be
# displayed in a table.
sub list_ajax_catch {
my $self = shift;
my $json = $self->param('data');
my $input = decode_json $json;
$self->render(
json => {
"Object A" => {
"name" => "Object A's Name",
"description" => "A Description for Object A",
"height" => "10",
"width" => "5",
}
}
);
}
1;
The problem is not limited to this instance. It seems that anytime there is a lot of processing on the server, the browser has troubles resetting. It doesn't matter what browser, I've tried Chrome, IE, Firefox, and others (on multiple computers). It doesn't matter if I'm not even sending or receiving data back and forth from the html to the app. All that seems to trigger it is if there is any amount of processing in my web app that is more than just rendering templates, BUT if I am running Hypnotoad, everything is fine.
This example is not one that requires a lot of processing, but it does cause the browser to reset, and as you can see, it shouldn't take long to run or freeze anything up. I thought the problem was a timeout issue, but by default, timeout doesn't happen until after 15 seconds, so it can't be that.
I have figured out the problem! This has been an issue for me for over a month now and I am so glad that it is working again. My problem was that when I started the morbo development server, I used the following command:
morbo -w ~/web_dev/my_app script/my_app
The -w allows me to watch a directory for changes so that I don't have to restart the app each time I changed some of my JavaScript files. My problem was that the directory I watched also contained my log files. So each time I went to my webpage, the logs would change and the server would restart.
I am trying all means to improve the loading time of an link in android webview in vain.I am using a link which has images and text fetched from external server by using some js functions and those images and text may change on any moment.In this scenario the code I used is as below.I am not interested in HTML 5 caching or server caching techniques,as the same link loads faster on browser fails to do the same in android webview.There is not much js script i can load from resource to improve performance hence most of the script just pulls data from external server and images from on amazon server.
WebSettings settings = getSettings();
settings.setJavaScriptEnabled(true);
settings.setPluginState(PluginState.ON);
settings.setRenderPriority(WebSettings.RenderPriority.HIGH);
settings.setDomStorageEnabled(false);
settings.setLoadsImagesAutomatically(true);
settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
settings.setJavaScriptEnabled(true);
settings.setAppCacheEnabled(false);
settings.setGeolocationEnabled(false);
1 .I guess turning on DomStaorage and AppCache to true have impact on loading time so i have turned it off. -> Is this true
2.In OnDestroy i call clearcache on webview to clear application cache - I am doing this hence i am afraid that my app size may grow as webview db grows if i fail to clear.-> is this must,or android handles this gracefully.
3.Few suggestion i hear is to set setCacheMode to LOAD_NO_CACHE and comment clearing webview cache in onDestroy. --> Does calling webview.clearcache() have any impact hence I have already set not to load from cache.
4.The link does not provide me information of previously refreshed time,in that case what cache mode could any one recommend.
5.Is there is any concert testing method to find out loading time on devices that takes network connection and server lags into account.hence the same page once it loads fast may load slow in some other time.
Give a try with "fast click".
mobile browsers will wait approximately 300ms from the time that you tap the button to fire the click event. The reason for this is that the browser is waiting to see if you are actually performing a double tap.
Download the script, add
<script type='application/javascript' src='fastclick.js'></script>
in your header and this code in your script.
window.addEventListener('load', function() {
FastClick.attach(document.body);
}, false);
More informations: https://developers.google.com/mobile/articles/fast_buttons
I have read all other posts and have been googling this for the last 2 hours! I started WCF Data Services about 3 hours ago btw.
My service is on an asp.net4 app, the ado entity model exposes an sql server db.
Here is FasDataService.svc.cs
public class FasDataService : DataService<FASStoreEntities>
{
public static void InitializeService(DataServiceConfiguration config)
{
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
config.UseVerboseErrors = true;
config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
config.SetEntitySetAccessRule("*", EntitySetRights.All);
}
}
I have then a winforms 4 app with the following code in the Main()
FASStoreEntities fas = new FASStoreEntities(u);
var a = from al in fas.Customers
where al.Name == "Alinio"
select al;
MessageBox.Show(a.First().Phone1);
When I run the web app and point to http://localhost:15995/FasDataService.svc/Customers(1) it loads up the one and only customer in there
My error is WebException was unhandled:
The operation has timed out. The inner
exception is null.
Also, everything is local but when I do this (in chrome) it takes a good load of time! Its scary to think of how it would perform in production?
For some reason, today I installed fiddler and tried it and it works! I also, queried the service with linqpad and it worked no prob!
Although throughout today I played with wcf data services and had tons of problems accessing data because of all kinds of errors, data connection was still open, some error insert excess data in a field etc etc.
Fiddler was very helpful at diagnosing what the error was, its very difficult to figure out what really went wrong so fiddler is a must have.