Webservice And Two "parallel" Requests From Client
Nov 5, 2010
I have such a problem. Suppose we have a client (WinForms app), which invokes some methods from webservice. Every 5 minutes (Interval of Timer) I invoke asynchronously webmethod A. Suppose that time of its execution take a 1 minute. When this operation runs, I open some Window, and invokes webmethod B synchronously... or i try to do it. Application suspended, wait until webmethod A ends, then process webmethod B (or I have an exception - Connection was closed, or Timeout...). Is there any possibility to run this A, B webmethods 'parallel'?
I have a piece of code written in 2 different ways, one a web service and another a WCF client which are trying to access an external 3rd party URL.
The same code when written as an exe works fine, i see my submissions on the 3rd party site, while the web code does not work.
I installed Fiddler to check traffic and to my surprise the web code works when Fiddler is capturing traffic, As soon as I stop Fiddler my code does not work.
For the web service code I get error: The remote name could not be resolved:
For the WCF client I get error: There was no endpoint listening at <<3rd party URL>> that could accept the message. This is often caused by an incorrect address or SOAP action.
Am quite sure now that this is because of some network and/or proxy on my corporate network, but not able to figure out what it can be.
Let's imaging there are 2 pages on the web site: quick and slow. Requests to slow page are executed for a 1 minute, request to quick 5 seconds.Whole my development career I thought that if 1st started request is slow: he will do a (synchronous) call to DB... wait answer... If during this time request to quick page will be done, this request will be processed while system is waiting for response from DB.[URL] One instance of the HttpApplication class is used to process many requests in its lifetime. However, it can process only one request at a time. Thus, member variables can be used to store per-request data.Does it mean that my original thoughts are wrong?Could you please clarify what they mean? I am pretty sure that thing are as I expect...
I've got a WCF web service that runs fine at the moment but there is talk about using it very heavily soon. As part of it's normal process it writes a file out, then reads it back in again (don't ask why, I know it's stupid). I'm concerned that if we start hitting it with lots of requests then the following might happen.
1. Request 1 writes the file out.
2. Request 2 comes in and overwrites the file.
3. Request 1 reads the file back in but this is now the wrong file.
My understanding is that the requests would naturally queue up so that request 2 wouldn't start until request 1 had finished, but I'm not totally sure.
The main issue is that I cannot run a webservice that accepts requests in JSON format. I keep getting a 500 Server error stating that the "request format is invalid." My ASP.NET AJAX extensions are installed. My server is running Plesk Control Panel 8.6 which is undoubtedly causing these problems.
The default handler for this specified extension is shown in the web.config like so:
For my applications webservice to handle JSON it needs to have this reference:
Plesk is not allowing the request to be handled properly. I need to know the correct http directive(s) to put into the web.config to properly handle JSON webservices.
I have a web app that needs to do two things at the same time. After a user clicks a button on the site, a javascript function needs to execute and while thats working I need the server side code for the button click to execute without waiting on the client side to finish.
To be more specific, the client side function takes about 23 seconds to complete, and while that is running the server side code promts the user for printing a document. So I need the javascript to run "in the background".
I have a few web servers behind an Amazon EC2 load balancer. I'm using TCP balancing on port 80 (rather than HTTP balancing). I have a client polling a Web Service (running on all web servers) for new items every few seconds. However, the client seems to stay connected to one server and polls that same server each time. I've tried using ServicePointManager to disable KeepAlive, but that didn't change anything. The outgoing connection still had its "connection: keep-alive" HTTP header, and the server kept the TCP connection open. I've also tried adding an override of GetWebRequest to the proxy class created by VS, which inherits from SoapHttpClientProtocol, but I still see the keep-alive header.
If I kill the client's process and restart, it'll connect to a new server via the load balancer, but it'll continue polling that new server forever. Is there a way to force it to connect to a random server each time? I want the load from the one client to be spread across all of the web servers. The client is written in C# (as is the server) and uses a Web Reference (not a Service Reference), which points to the load balancer.
I have a long poll HTTP request using ASP.NET 4, MVC 2 and AsyncController. If a user closes their browser and kills the HTTP connection without the request completing, I'd like to know about it and completely clean up after them. If I don't, the open and incomplete requests just sit there and eventually IIS stops accepting new requests.
You can simulate my long running HTTP request by making a normal ASP.NET application with a page that has a Thread.Sleep. Even if you close the browser, the request carries on as if it hasn't.
There is a property called Response.IsClientConnected that gets switched to false if the client disconnects, and I can poll this to achieve the desired effect but it's not very clean and I'd like to avoid polling. Is there a way of getting notified when this happens rather than having to poll this property?
I created a webservice solution using VS2010. I can browse to http://localhost:1259/ResultsWebServices/FG_Results.asmx and click on my webservice which is Get_FG_Results, enter my case num and get the XML back. Works fine as expected. FG
For trial purpose, I added another project in the same solution which is supposed to be this webservice client. I added a web refrence to Get_FG_Results. On the default page I added a GridView to display the resuls fetched by the webservice.
I have a method BindDataToGrid being called at the page load. How do I call my webservice from this method to populate the GridView?
What else do I need to do so that this webservice is available to other applications?
I want to write a webservice, and in one of its methods, I want user to pass one my object's instance as parameter. It will greatly reduces number of parameters, and help user call this method more effectively. I create some class, but when distributing them to client, only class name remains, all properties and methods are gone, just like this
public class CameraPackages { private readonly List<CameraPackage> _packages; public CameraPackages() { _packages = new List<CameraPackage>(); } public void AddNewCamera(CameraPackage package) { _packages.Add(package); } public void RemoveCamera(CameraPackage package) { if(_packages.Contains(package)) _packages.Remove(package); else throw new ArgumentException(); } } into this: (in Reference.cs) [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "2.0.50727.3082")] [System.SerializableAttribute()] [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://tempuri.org/")] public partial class CameraPackages { }
I have web service on server! This service is calling from the clients applications!
Now how i can get user name and computer name of clients that using this service, for example if application from Clint1 calling this service i want to get computer name and user name of Clint1?
I want to build a webservice that has to get some data as parameter from the client application. the data from the client side are records from there database. my websercie has to send then these data to a soap server through 'HttpWebRequest'. Can i get the data as Datatable? and then send as stream to the soap server? Or maybe there is a better easier ways?
There is an external (Java based ) web service that i am calling. I've added my service reference and verified that Reference.cs has been generated.
Then i call my service form my client website like such:
[Code]....
But my response object is mostly null after it receives the response. The properties that should have values do NOT.
When i look at Trace viewer, the SOAP request is correct and the SOAP response is correct. I get back a valid soap response with all the data i need it's just not making its way back to my response object. I've tried regenerating the proxy many different ways (svcutil) with no luck.
Example of what is in the response object (good data which is not making it's way back to my response object):
What's the simplest and most effective way to selectively redirect HTTP requests to your ASP.NET page to its HTTPS equivalent? For example, if my page site URL is [URL], I want to redirect some (or all) page requests to [URL] What's the easiest way to do that?
How do I protect a webservice if it is called from ajax ?
Update: I realize that my question didn't reflect what I intended to ask. I don't want user to be able to do the request by pointing to it with its webbrowser but only in the context of my app.
I am trying to consume a third party web service. In order to access any web method I need to pass session id with soap header in each request. I am trying to modify my header but haven't been successful. I am using proxy in 2.0. I created a separate class which inherits the soap header. I have copied my code but I am not sure how to go about this. How do I attach this header to proxy.
GetDataForYearWorker gets the response from a webservice synchronously. It uses very little computing power on my asp.net application, but it ussualy takes 3-5 sec for each webservice response. Because the calls to the webservice are independent of eachother, I want to make tham all at the same time. But it looks like only 2 threads can run at the same time. Why is this and how can I have 8 threads working at the same time?
It seems that by default, ASP.NET 3.5 running on IIS 6.0 does not do any parallel processing whatsoever. With a quad-core system and a test webforms application that runs an infinite while loop on the server, CPU usage never goes higher than 30% regardless of how many clients are connected and independently running the while loop.What are my options for enabling parallel processing?
We are using 6 iFrames on our page. They fetch data from couple of external web services and an internal WCF service and display the data. There is a separate aspx page built for each of the iFrames. From our perf monitoring we found out that at any point only two threads are executing in parallel. Not all 6 threads get executed. What can probably be cause for this? Is there any restriction that more than 2 threads can't be created in parallel? Is there any configuration where I can change this?
I'm working on an ASP.NET MVC application that uses the Google Maps Geocoding API. In a single batch there may be upto 1000 queries to submit to the Geocoding API, so I'm trying to use a parallel processing approach to imporove performance. The method responsible for starting a process for each core is:
public void GeoCode(Queue<Job> qJobs, bool bolKeepTrying, bool bolSpellCheck, Action<Job, bool, bool> aWorker) { // Get the number of processors, initialize the number of remaining // threads, and set the starting point for the iteration. int intCoreCount = Environment.ProcessorCount; int intRemainingWorkItems = intCoreCount;
[Code]...
This is based on patterns document I found on Microsoft's parallel computing web site. The problem is that the Google API has a limit of 10 QPS (enterprise customer) - which I'm hitting - then I get HTTP 403 error's. Is this a way I can benefit from parallel processing but limit the requests I'm making? I've tried using Thread.Sleep but it doesn't solve the problem.
Currently we are developing an ASMX, ASP 2.0, IIS 7 web service that does some calculations (and return a dynamically generated document) and will take approx. 60 seconds to run.Since whe have a big machine with multiple cores and lots of RAM, I expected that IIS tries its best to route the requests that arrive in its requests queue to all available threads of the app pool's thread pool.But we experience quiet the opposite:When we issue requests to the ASMX web service URL from multiple different clients, the IIS seems to serially process these requests. I.e. request 1 arrives, is being processed, then request 2 is being processed, then request 3, etc
I have a static class with a static get property, and in this property, I do this:
// property body { // HttpContext.Current is NOT null Parallel.ForEach(files, file => { // HttpContext.Current is null var promo = new Promotion(); }); // HttpContext.Current is NOT null }
This static class doesn't undergone type initialization until a view uses this property.
The problem is that Promotion's static constructor, which is initialized the first time a new Promotion() is created within the Parallel.ForEach(), uses HttpContext.Current. When promo is instantiated within the scope of this Parallel.ForEach(), HttpContext.Current is null, and new Promotion() therefore causes an exception.
HttpContext.Current is not null within the static get property because it's not called until the view uses it (and there is therefore a HttpContext.Current).
If Promotion used HttpContext.Current in its instances instead of its static members, I could probably just pass HttpContext.Current into the new Promotion() constructor:
var context = HttpContext.Current; Parallel.ForEach(files, file => { var promo = new Promotion(context); });
But since static members of Promotion need HttpContext.Current, I can't. I could probably redesign the Promotion class to change the static members that need it to be instance members, but they are static for a reason--there would be a large performance penalty if all the members that were static had to be defined instead on each instance each time a new Promotion was instantiated.
What are the possible workarounds for this? I didn't realize HttpContext.Current would be null within the scope of Parallel.ForEach().
