wcf returning only html of metadata page - c#

UPDATE: i have solved my issue:
the following config line needed removed:
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"
multipleSiteBindingsEnabled="true" />
When i run the wcftestclient utility i get the following error and result from the services when invoking hello world. Any help is greatly appreciated. I cant seem to find the issue as to why it wont invoke the specific method and return the string for hello world.
Failed to invoke the service. Possible causes: The service is offline or inaccessible; the client-side configuration does not match the proxy; the existing proxy is invalid. Refer to the stack trace for more detail. You can try to recover by starting a new proxy, restoring to default configuration, or refreshing the service.

Related

How do I add TLS to a WCF service?

I've been trying to add TLS to a WCF service, I've created.
Everything is OK until I try to access the service through https instead of http.
When adding the wcf service to the wcf test client, I get this:
Error: Cannot obtain Metadata from [THELINK] If this is a Windows (R)
Communication Foundation service to which you have access, please
check that you have enabled metadata publishing at the specified
address. For help enabling metadata publishing, please refer to the
MSDN documentation at [an MS link] Exchange Error URI: [THELINK]
Metadata contains a reference that cannot be resolved: '[THELINK]'.
There was no endpoint listening at [THELINK] that could accept the
message. This is often caused by an incorrect address or SOAP action.
See InnerException, if present, for more details. The remote server
returned an error: (403) Forbidden.HTTP GET Error URI: [THELINK]
There was an error downloading '[THELINK]'. The request failed with
HTTP status 403: Forbidden.
Sorry about the link replacing, but I'm new and I don't have the reputation, it seems :)
Regards,
Morten
do you have a
<behaviors>
<serviceBehaviors>
<behavior name="YourSerivceBehaviourName">
<serviceMetadata httpsGetEnabled="true" /> <-- this bit ?
...
...
being referenced by your
<service name="...." behaviorConfiguration="YourSerivceBehaviourName">
or a
<endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange" />
in your web.config?
the Test client will also moan if the certificate isn't a real one I have found.. ie a self certed one for testing.
but the 403 seems to suggest that whatever credentials you are supplying are incorrect, what is the clientCredentialType set to in the SSL binding?
and what happens if you hit the link in a browser with customerrors off..
this might give you some more useful information

Can you mimic an existing service in WCF?

We have a 3rd party vendor service and an in-house service to communicate with it. Everything works perfectly with our in-house service, but I've been asked to write a fall back clone of our vendor's service. The intention is to be able to run up our clone, swap-out the client end-point and allow our in-house service to continue testing against the clone.
Is it possible to recreate/mimic a service such that an existing client can communicate with it (without modification) as if it were the original service?
So far I’ve tried 3 things and none of them work.
1st approach
Create a simple service, reference the 3rd party service to gain access to the custom types and mimic the [operation Contract]’s.
When I try to communicate with this service I get the following error.
A first chance exception of type 'System.ServiceModel.ActionNotSupportedException' occurred in System.ServiceModel.dll
Additional information: The message with Action '' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None).
There is no security requirements as we are using basic http (no ssl). The service model portion of the config file and the service behaviour class attributes are below:
<system.serviceModel>
<bindings>
<basicHttpBinding>
<binding name="SimpleBinding" />
</basicHttpBinding>
</bindings>
<services>
<service behaviorConfiguration="cloneBehavior" name="MyClone">
<endpoint address="" binding="basicHttpBinding" bindingConfiguration="SimpleBinding"
contract="MyService.IMyService" />
<host>
<baseAddresses>
<add baseAddress="http://localhost/clone/" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="cloneBehavior">
<serviceMetadata httpGetEnabled="True" httpGetUrl="http://localhost/clone/mex" />
<serviceDebug includeExceptionDetailInFaults="False" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
and the service behaviour
[ServiceBehavior(Name = "CloneService",
ConfigurationName = "MyClone",
InstanceContextMode = InstanceContextMode.PerCall,
AddressFilterMode = AddressFilterMode.Any)]
public class MyService : IMyService
{
Everything looks good and I have come to my first dead end.
2nd approach
Get rid of my interface/service contract and inherit directly from the interface generated in the reference.cs file.
When I run this service up, I get the following error
System.InvalidOperationException: The operations myMethodA and myMethodB have the same action (). Every operation must have a unique action value.
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ActionDemuxer.Add(String action, DispatchOperationRuntime operation)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime..ctor(DispatchRuntime dispatch)
at System.ServiceModel.Dispatcher.DispatchRuntime.GetRuntimeCore()
at System.ServiceModel.Dispatcher.ChannelDispatcher.OnOpened()
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout)
at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
at Microsoft.Tools.SvcHost.ServiceHostHelper.OpenService(ServiceInfo info)
Taking a look at the generated interface for this method, they are all decorated with the following attribute:
[System.ServiceModel.OperationContractAttribute(Action="", ReplyAction="*")]
My understanding from msdn is that WCF defaults to adding a unique action of the pattern <namespace>/<service>/<operation>[Response].
If I try setting the action to * then I can hit the service (as expected with the catch all / unmatched message handler), but I can't hit a specific method.
Nevertheless, manually making all the actions unique (and conforming to the above pattern), give this error:
The contract ‘IMyService’ in client configuration does not match the name in service contract, or there is no valid method in this contract.
…
I have clearly defined methods in the service contract and have come to a second dead end.
3rd approach
Using the wsdl.exe tool to generate a service from the wsdl. I followed the instructions from this SO post to generate an interface and inherit from it.
I’ve also tried generating the service itself by using the clientWsdl.wsdl /l:CS /server command and following the instructions in this post.
After tidying up the generated code and running it up, I’m back to my original error:
A first chance exception of type 'System.ServiceModel.ActionNotSupportedException' occurred in System.ServiceModel.dll
Additional information: The message with Action '' cannot be processed at the receiver, due to a ContractFilter mismatch at the EndpointDispatcher. This may be because of either a contract mismatch (mismatched Actions between sender and receiver) or a binding/security mismatch between the sender and the receiver. Check that sender and receiver have the same contract and the same binding (including security requirements, e.g. Message, Transport, None).
At each attempt I have double checked all the config settings and updated the contract at each stage.
At this stage I'm wondering if it's even possible.
Were you ever able to mimic the service using WCF? I find myself in a similar situation where I've been tasked to write some integration tests where our method makes a call to a vendor's web service. I would have preferred to leverage Moq to write proper unit tests, but I'm constrained by 1) not being allowed to change the signature of the method that I'm testing, and 2) not really knowing anything about the web service itself except for what we send to the service and its expected response.
#jparram's suggestion was my next approach.
Note: I would have preferred to have posted this as a comment seeing that I'm not really answering your question.
If I understand your scenario, I would create wrapper service that decides which service to call. It sounds like that's what you want to do with Scenario 1. So, your client would always be calling your wrapper service, and your wrapper service would map the inputs to the required inputs of your 3rd party service or your back up service.
The error you received sounds like an issue in the generation of the proxy client where the "Action" is not getting mapped. Take a look at the generated proxy code from a known working configuration and compare it to what is in your scenario 1.
Edit
Compare the generated proxy client of your service and the 'real' service. The complaint about the Action = "" is probably due to the:
[System.ServiceModel.OperationContractAttribute(Action="", ReplyAction="")]
On your client not getting mapped to the corresponding operation.

Getting Error "This collection already contains an address with scheme http" with WCF on local machine

I'm trying out WCF for the first time and getting the following error when I try to instantiate the host:
This collection already contains an address with scheme http...
I have found a lot of other references to this and tried some of the solution to no avail. One fairly common thread that does not apply to me is that the problem is on a web server of some sort. I'm just running everything from my local machine.
One interesting symptom I found is that I'm developing a c# Forms app. Originally my top level form object inherited my service interface instead of a separate Service class. When I implement this way, there is no error on the host side but I have been having trouble on the client side.
Based on this solution:
How to solve "The ChannelDispatcher is unable to open its IChannelListener" error?
...I decided to separate the service host into a separate object. That's when I start seeing the problem.
The ServiceContract is simple enough:
[ServiceContract]
public interface ISSAService
{
[OperationContract]
void CreateSpaMonitor();
}
I instantiate the service like this:
Uri baseAddr = new Uri("http://localhost:8000/SSAService");
ServiceHost localHost = new ServiceHost(typeof(SSAService), baseAddr);
Where SSAService is the implementation of the Service interface.
If I change the second line to the following (and implement the interface...) the error goes away:
Uri baseAddr = new Uri("http://localhost:8000/SSAService");
ServiceHost localHost = new ServiceHost(typeof(SSAManager), baseAddr);
Where SSAManager is my top level Forms class...
Then I run into a client side problem which is where I started....
I have tried changing the port number and that doesn't seem to affect anything.
I'm new to WCF so maybe I'm missing something obvious.
Thanks.
I was getting this error:
This collection already contains an address with scheme https. There can be at most one address per scheme in this collection. If your service is being hosted in IIS you can fix the problem by setting 'system.serviceModel/serviceHostingEnvironment/multipleSiteBindingsEnabled' to true or specifying 'system.serviceModel/serviceHostingEnvironment/baseAddressPrefixFilters'.
Parameter name: item
I resolved it by doing the following to my web.config. Perhaps something changed in the .NET Framework 4 which is requiring this line, since I didn't need it before:
<system.serviceModel>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
<!-- Rest of the system.serviceModel content omitted for brevity--->
<system.serviceModel>
This can also occur if you have multiple bindings on the same IIS site with different domain names/ports. I resolved the issue by removing the extra named binding.
One of the solution I found previously was to add something like this:
<serviceHostingEnvironment>
<baseAddressPrefixFilters>
<add prefix="http://localhost:8000"/>
</baseAddressPrefixFilters>
</serviceHostingEnvironment>
And then specifying the endpoint address absolutely. This didn't seem to have an effect but I was still using baseAddr in the constructor as shown above.
The solution for me was to remove baseAddr from the constructor.

Error when trying to add a Service Reference

I´m trying to create a client in C# to a web service which (I suppose) is written in Java. It´s my first time trying to write a client, so I´m following the instructions on MSDN, but I´m stuck on a problem with Add Reference. When I open the Add Service Reference dialog and add the URL, an error occurs:
There was an error downloading 'http://geoportal.cuzk.cz/WCTService/WCTService.svc'.
The request failed with HTTP status 404: Not Found.
Metadata contains a reference that cannot be resolved: 'http://geoportal.cuzk.cz/WCTService/WCTService.svc'.
There was no endpoint listening at http://geoportal.cuzk.cz/WCTService/WCTService.svc that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.
The remote server returned an error: (404) Not Found.
If the service is defined in the current solution, try building the solution and adding the service reference again.
What should my next step be? I don´t know what I should do with this!
(It is a coordinates-transformation service from the Czech Republic.)
For more information:
Property services (GetCapabilities)
http://geoportal.cuzk.cz/WCTService/WCTService.svc/get?
Localization services:
http://geoportal.cuzk.cz/WCTService/WCTService.svc/get?request=GetCapabilities&service=WCTS
I was facing a similar situation in which I had created a WCF Service (Employee.svc) and later changed the named to EmployeeService.svc. WCF project compiled just fine but when I was trying to add service reference from by UI Client, I was getting following error:
Metadata contains a reference that cannot be resolved: 'http://localhost:2278/EmployeeService.svc?wsdl'.
The document format is not recognized (the content type is 'text/html; charset=UTF-8').
Metadata contains a reference that cannot be resolved: 'http://localhost:2278/EmployeeService.svc'.
There was no endpoint listening at 'http://localhost:2278/EmployeeService.svc' that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.
The remote server returned an error: (404) Not Found.
If the service is defined in the current solution, try building the solution and adding the service reference again.
I resolved it by replacing the correct service class name everywhere. In my case, it should have been EmployeeService and NOT employee. The left out place was in the markup code of svc file:
<%# ServiceHost Language="C#" Debug="true" Service="WCFServiceHost.**Employee**" CodeBehind="EmployeeService.svc.cs" %>
Changed it to
<%# ServiceHost Language="C#" Debug="true" Service="WCFServiceHost.**EmployeeService**" CodeBehind="EmployeeService.svc.cs" %>
And it started working again!!! Dont forget to build your WCF project after changing the service name.
I tried browsing to http://geoportal.cuzk.cz/WCTService/WCTService.svc?wsdl. It looks like this service is not exposing metadata.
I did a bit of googling on OpenGIS, and I think you need to have a look at this article:
OpenGIS with .NET
You won't be able to just add a service reference and go. It looks like you need to craft a concrete WSDL.
There may be a client-side library you can use / customize to assist with integration. Have a look at Stack Overflow question Using MySQL GeoSpatial data types in .NET.
I know this is an old thread and has already been resolved, but I just finished troubleshooting this exact issue, and none of the resolutions presented here worked for me. Wanted to share my resolution in case anyone else runs into this thread with a similar issue.
My ENTIRE issue stemmed from a bad Refactor->Rename operation. I recently purchased Resharper for my dev team and Resharper did not like the name of our service implementation name. We had named it "WCFAccess" and Resharper wanted the name "WcfAccess". I had just published an update, had the release safely isolated in its own release branch in git, and figured this was a good time to perform a rename on the develop branch and shut Resharper up about the naming. I used Refactor->Rename to change the name of the file to match the naming convention we had defined in the Resharper configuration. The rename operation completed, the solution compiled and ran, time goes on and the WCF rename was forgotten.
Fast forward a couple weeks, and its time to deploy out web services to the test environment for regression testing. The solution compiled successfully, published successfully, then gave me the EXACT error that the OP posted. What I ended up finding out is that the Rename operation from weeks ago ONLY UPDATED SOURCE CODE REFERENCES to the old name and did not rename MARKUP. When I navigated out to our web server where the service was published to and double clicked on the .svc file, it opened the markup in Visual Studio and I noticed that the character casing of the CodeBehind="ServiceNameHere.svc.vb" was inconstant with the new naming convention. Updating the markup and web.config files to reference the correct character casing resolved my issue.
I hope this helps someone. It was incredibly frustrating to troubleshoot
(Please don't hate me for using VB.Net, I inherited this application) :-)
Is the service definitely up and running before you try to add a service reference? If it exposes meta data, does it have a service behaviour or equivalent configured? Have you configured your firewall correctly?
While adding service reference to the client application, metadata is not accessible from service to client application. hence The remote server returned an error: (404) Not Found. Actually we can host the WCF service as follows:
Self hosting(console application)
IIS Hosting
WAS Hosting
window service hosting.
if you are using self hosting then you need to host the service in console application and run the service(run the console application) and then add the service reference to the client application, then metadata would be exchange. If service is not running then while adding service reference to the client application then 404 not found error would be getting. Same process would follow for all the hosting type. first run the service then add service reference.
I had the same problem happen to me earlier today. The webservice was running fine on local host but for some reason, I was having a 400 when trying to add the service reference in another project.
My error was caused by setting the [DataMember] annotation instead of the [EnumMember] annotation on an enum of the service. Changing it solved my issue.
The webservices doesn't run.
If you don't have access to the server where this service run, you're blocked.
Otherwise, you need to check if the server run, etc. As I don't know how the Java webservice is run, I can't help you further.

Read Global Application property from WCF Service

I'm using in my Global.asax class the object Application to store data.
Application.Set("data", "test");
Now, in my WCF Service, I want to be abble to read this property. How can I do that?
Application["data"];
In debug, I can see my global.asax is called (Begin_Request), but in my webservice's method, how can I access to this Application?
var yourData=HttpContext.Current.Application["data"];
bear in mind anyway thay if you will deploy the Service on a Server Farm you could have issues as the Application is inProc and each server will have its own Application variable
in order to get the HttpContext.Current working with wcf you gotta turn on compatibility:
<system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />
</system.serviceModel>
then you can get access as Massimiliano Peluso suggests:
// in the wcf service
var yourData=HttpContext.Current.Application["data"];

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