C# - Synchronicity Of Web Service Calls
Jul 29, 2010
Are web service calls synchronous or asynchronous by default? How is synchronicity determined, by the service or by the client?
I have code similar to the following:
try
{
string result = MakeWebServiceCall_1(); // this is a third party webservice
[code]....
In the above, SetStatus is writing to the same tables that the third party web services read from. If I change the status before both web service calls have completed, it's going to make a big mess and I'm going to get fired. How do I know/ensure that the webservice calls are synchronous?
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Feb 18, 2010
I have a SOAP web service and I'm trying to figure how to save/log the last 10 requests for each user. Each user is required to send their user/pass in each request, so it's easy to know who the request originated from. With these last 10 requests saved, my goal is to develop some sort of page that will allow them to log-in with their credentials and view the raw request, the actual SOAP message, http header information, and anything relevant that I can think of.
The point is to allow people to troubleshoot their own connection issues instead of having to contact me each time they can't connect, have trouble formatting their request, etc....
My first thought was to store all this information in memory in a hashtable or something, but that may have scalability issues when we have hundreds/thousands of users hitting the web service.
We could use our database to store these requests. Instead of hitting the database each time, I may need to create some "buffer" mechanism that will only update the database after the buffer gets to a certain number of requests. Is there an existing library or mechanism that will do this?
We can't store these requests on the file system on the machine hosting the web service. Since these requests can potentially contain sensitive information, it's a business decision that I'll need to work around. Or maybe there's a better way to achieve what I'm trying to do?
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Nov 12, 2011
I've got a web app running with purely web services like these:
Code:
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=False)> _
Public Function EditService(ByVal toddtype As String _
, ByVal fromddtype As String _
[Code] ....
And I want to log each web service call. I don't want to bother my database with this log - I would prefer to have the web app log to a text file on the web server itself.
How would I open and access a log file like this from a bunch of web services? Does web app still have application startup like events???
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Sep 23, 2010
I'm trying to make API calls to a service provider. I've never tackled JSON requests before but I want to give it a go - as they seem less verbose than XML. Could someone be kind enough to give me a simple example here?
My confusion stems from some libraries I've come across. Do I need to add any libraries to my project? Or is it just a matter of creating a string that complies with JSON syntax and send it via a WebRequest?
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Nov 18, 2010
We have a page that makes a request to a 3'rd party web service. When under heavy load this response time extends significantly, however the 3'rd party reports back that there times for processing remains constant. There timings show that from the time they receive a request to the time they send it back is always around 1.5-2.0 seconds. Now we are experiencing wait times of over 20 seconds. My understanding of ASP.NET is that each request will run on a IIS thread pool thread and make the request to the 3'rd party service return and process. So I don't really understand what could be blocking on our end. Is there something I am missing?? Is there a threshold limit beyond IIS that is blocking?
If I am missing something a physical book recommendation that covers this subject would also be a very welcome addition to any answer.
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Oct 5, 2010
This is quite straight forward. I'm calling a web-service (.asmx, with session enabled) from a c# application. I want each call to be with the same session key as the previous one (as opposed to creating a new session key each time).
Here's my (nothing-out-of-the-ordinary) code:
[Code].....
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Apr 17, 2010
I am successful in using the AutoCompleteExtender control by make use of web serivces as the data source (ServiceMethod) to the extender control. My question is do we have any way in assining a code behind method as data source to this control.
removing the ServicePath url and assiging code behind method to ServiceMethod attribute will resolve the issue.
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May 4, 2010
We have a WCF service (BasicHttpBinding) which will always fail after 30 seconds. Calls under 30 seconds complete without error. Anything over 30 seconds will fail with a 502 Bad Gateway exception:
System.Net.WebException: The remote server returned an error: (502) Bad Gateway.
But yet the WCF call continues to run in the background (and will eventually complete). We have confirmed that the BasicHttpBinding - Binding - sendTimeout (in web.config) is greater than 30 seconds (actually set to 5 minutes). We confirmed this both on the client and the server.
Here is the full stack trace:
System.ServiceModel.ProtocolException: The remote server returned an unexpected response: (502) Bad Gateway. ---> System.Net.WebException: The remote server returned an error: (502) Bad Gateway.
at System.Net.HttpWebRequest.GetResponse()
at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
[Code]....
where this 30 second "timeout" is coming from or why a 502 Bad Gateway error is returned?
SOLUTION: We are using the IIS7 Application Request Routing Module which has Proxy settings of its own. The Proxy settings have a default timeout of 30 seconds. Increasing this to 600 seconds (10 minutes) solved our problem. The Bad Gateway error is not completely correct but WCF Trace Viewer (see answer) helped see that the problem was not the service itself but an issue in between the client and the wcf service.
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Nov 22, 2010
We have a custom Ajax checkbox control. In that control we set value (from inside the control) via a web service call (say WSCall1) to the business engine. There is also an event exposed on the OnClick of checkbox for the end user to have their custom code where the end user have their own web service call (say WSCall2). This event that end users will write is handled inside the ajax checkbox control on the "OnSuccess" of the internal web service call (i.e WSCall1) with an expectation that if WSCall1 succeeds, WSCall2 will get executed. This works fine with Firefox and Chrome but not in IE. In IE sometimes WSCall2 gets executed first and then WSCall1 -- actually there is no gurantee which web service gets called first. For WSCall1 we have used " Sys.Net.WebServiceProxy.invoke"
Is there a way we can make sure that WSCall2 gets only executed on the "OnSuccess" of WSCall1? Isn't the OnSuceess supposed to be executed when the WSCall1 thread returns?
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Jan 20, 2010
I can't seem to call a web service method from Ajax with both POST and GET.
Initially only the POST would work and GET would causes this error:
{"Message":"An attempt was made to call the method u0027getDatau0027 using a GET request, which is not allowed.","StackTrace":" at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext
context, WebServiceMethodData methodData)","ExceptionType":"System.InvalidOperationException"}
I fixed that by adding this attribute: [ScriptMethod(UseHttpGet=true)] but now GET causes this error:
[code]....
So is it true that you can only use either POST or GET and not both from Ajax?
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May 26, 2010
I have to show the time taken for a service call in Perfmon from my ASP.Net application. For this, I have added a stopwatch which starts at the service call start and stops at service call stop. Now I have a custom counter which user AverageTimer32 to log the stopwatch values to Perfmon. My question is, how can I show the service names on the Perfmon graph. I am using windows XP (I know windows server perfmon has some fancy stuff).
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Sep 3, 2010
I haven't deployed behind a load balancer before. My customer has a WCF service built and tested on servers using a service model configuration that is relatively straightforward. It provides a service to return an image of a map for another application. To get the map, it calls other services.
The service was built in Visual Studio 2010 targeting the 3.5 framework. The customer is using IIS 7.5 and an F5 load balancer. When moving to the production server, the Web.config was changed to add the load balancer behavior and specify the endpoint to show the physical and logical address of the service:
[Code].....
There was a problem when the service was deployed to a server behind the load balancer. When I try to call the service from WCFStorm or WebServiceStudio I get the message "The provided URI scheme 'https' is invalid; expected 'http'.
The endpoints for the service itself look right to me. However in the development and testing versions of the config, the client section uses http instead of http, while on the production servers it uses the load balancer's https address. This seems like it should be obvious, but we're missing it.
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Sep 14, 2010
Here is how my system is set up:
A web service using ASP.Net web service The web service has a web method with EnableSession=true
A client which refers to the web service using "Service References" (note: not "Web References")
The app.config of the client has allowCookies=true
[Code].....
The call to AppendUpload returns false, because of the mismatching session ids. Why is that?
As far as I can see, I have the right attributes for the web method, the client has the correct config, and the same instance of the proxy is used.
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Jun 3, 2010
This question may have been asked before, but I'm looking for a different answer than what I've seen.
Our website is in ASP.NET and we use the model-view-presenter pattern to get business logic out of the markup codebehind.
Is there an accepted pattern for web services for getting business logic out of the codebehind? It seems like putting the logic in a 'presenter' is misleading since the calls don't really present anything to the user, and may not even send back data to the client.
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Jun 11, 2010
So I've got my jquery autocomplete 'working,' but its a little fidgety since I call the webservice method each time a keydown() fires so I get lots of methods hanging and sometimes to get the "auto" to work I have to type it out and backspace a bit because i'm assuming it got its return value a little slow. I've limited the query results to 8 to mininmize time. Is there anything i can do to make this a little snappier? This thing seems near useless if I don't get it a little more responsive.
[Code].....
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Jun 6, 2010
I have a WCF service returning JSON to jQuery ajax calls and presenting the results on an ASPX page. When the page is NOT under SSL, the ajax calls work perfectly. When the page IS under SSL, the calls fail. I understand that this behavior must be due to the Same Origin Policy (SOP).
So, how do I setup my WCF service to accept calls from an SSL-secured page? Does the WCF service also need to be secured? If so, how do I do this?
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Oct 8, 2010
I am trying to update client side controls asynchronously with information from a service.
The service I am using has a callback delegate that points to the users web page (server side)
I would like to update information on the page that is initiated by another users also consuming the same service. exactly like a chatroom.
I am trying to use an update panel, and call updatepanel.update() (server side) once I recieve the information from the service. basically: how do I partially update control data from the server side so that client side can see it.
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Feb 17, 2010
I have the following Page_Load function...
protected void Page_Load(object sender, EventArgs e)
{
XmlDataSource1.Data = GetXmlFromFile(Request.QueryString["file"]);
XmlDataSource1.DataBind();
Repeater1.DataBind();
}
The page in which this Page_Load resides is called by a parent page. Each time this Page_Load gets called the value of "file" in the query string will be different. So each time I will be receiving the XML contents from a different file which are inserted into the XmlDataSource and then bound against by the Repeater. Getting the XML data from the file works great but when I bind against the repeater that only works the first time through Page_Load. Each time after that when this code is executed the same results from the first XML file are displayed in the repeater.
What am I missing here. How can I get the XML data to be bound against the repeater on each page load instead of just the first one?
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May 10, 2010
I have a webservice (ASP.NET) deployed on a webfarm. A client application consumes it on daily basis. The problem is that some of its calls are duplicated (with difference of milliseconds). For example I have a function Foo(string a,string b). The client app calls this webmethod as Foo('test1','test2') once but my log shows that it is being called twice or sometimes 3 or 4 times randomly. Is this anything wrong with the webfarm or the code? Note that the webmethod has simple straighfarward insert and update statements.
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Feb 24, 2010
I have an ASP page, which on load fires a bunch of AJAX calls. How can I detect in javascript that all AJAX calls finished? The ajax calls are made using AJAXPRO library. I need this in order to execute some event.
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Aug 25, 2010
How do you make SMO release it's connections?
I have this code:
[Code]....
For every call I make to this index method a connection is spun up - and is not released again.
So after 20 calls to the page, I have 20 of the connections awaiting command. This eventually ends up with an exception, when I cannot make new connections, because the connection pool is full.
What do I need to avoid this happening? I cannot seem to find a method on the SMO Server object like Dispose, close or similar.
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Mar 15, 2010
Can I call a PageMethod and then call another PageMethod before the first has finished? Are concurrent calls to PageMethods allowed?
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Mar 31, 2011
Are there any transactions around multiple webservice calls.Let me start with a commonly used example -- the travel agency. A customer intends to create a travel plan through an online travel agency. To do this, the online travel application calls the following three Web services:
-Air ticket booking
-Hotel reservation
-Taxi reservation
These three services are available from three separate vendors. If any one of these three services fails, the customer does not wish to proceed with the transaction (again, either all three services must succeed or none at all).My language programming is Asp.net c#.
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Apr 4, 2011
Are there any transactions around multiple webservice calls?but in ASP.net forum I got the answer below:
http://jalpesh.blogspot.com/2010/05/using-transactions-with-linq-to-sql.html it's offering system.transaction.
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Dec 1, 2010
I have data that is stored on a local machine and periodically replicated using webservices. This data is critical to the application of this program and is along the lines of business transactions.
TransactionHeader JOIN TransactionDetail
So forth.
Should I be using some type of CRC checking when sending the data to the webservice or is this handled by the TCP protocol itself sufficiently?
EDIT: Just to be clear the data isnt deleted from the client until the server acknowledges receipt and I use strongly typed parameters in my webservice but I am more thinking about "mangled" data (although in all cases but string it should theoretically fail datatype casting).
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