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• Communication between WCF service [library] and Self-host [Winform]

  - by Mur Haf Soz

  Introduction: I have a WCF service library and a self-host Winform. Service features is File explorer including (copy, move, delete, new folder, delete... etc) and Task Manager (run, kill, update list). Then now I want to add other features like chatting between self-host and client, send an image from client to self-host so when it received, it is shown in a pictureBox in a new form. Till now I have two endpoints for (Task Manager, File Manager) that runs under one service "MainService". And I set up all the connections using DotNet 4.0 WCF Configuration and Wizards, and I'm using netTcpBinding. Problem: I need to know how to communicate with between WCF service lib and self-host, so I can append a received chat from client on self-host form's textbox TextBoxChat. And also call a client callback from self-host when Send button clicked, to send the message from self-host textbox TextBoxMessage. Let's say this's self-host ChatForm So is it possible to do that in WCF? I would prefer to run ChatEndpoint under MainService, so all Endpoints use one port.

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• WCF REST POST error bad request 400

  - by lyatcomit

  Here's my code: DOAMIN: using System; using System.Collections; using System.Runtime.Serialization; namespace Comit.TrafficService.Services.Mobile { [DataContract(Namespace = "http://192.168.0.161:9999/TrafficService/Domain/Mobile")] public class Error { [DataMember] public int Id { get; set; } [DataMember] public DateTime Time { get; set; } public string Message { get; set; } [DataMember] public string Stacktrace { get; set; } [DataMember] public string Os { get; set; } [DataMember] public string Resolution { get; set; } } } CONTRACT: using System.ServiceModel; using System.ServiceModel.Web; using Comit.TrafficService.Services.Mobile; namespace Comit.TrafficService.Services.Contracts { [ServiceContract(Name = "MobileErrorService")] public interface IMobileError { /// <summary> /// ??????????? /// </summary> /// <param name="Error">??????</param> /// <returns></returns> [OperationContract] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedResponse, UriTemplate = "ErrorReport", RequestFormat = WebMessageFormat.Xml, ResponseFormat = WebMessageFormat.Xml) ] int ErrorReport(Error error); } } SERVICE: using System.ServiceModel.Web; using Comit.TrafficService.Services.Contracts; using Comit.TrafficService.Dao.Mobile; using System; using Comit.TrafficService.Services.Mobile; namespace Comit.TrafficService.Services { public class MobileErrorService : IMobileError { public int ErrorReport(Error error) { return HandleAdd(error); } public int HandleAdd(Error error) { Console.WriteLine("?????error.Message:" + error.Message); ErrorDao edao = new ErrorDao(); Console.WriteLine("??error" ); int result = (int)edao.Add(error); return result; } } } Configuration: <?xml version="1.0" encoding="utf-8" ?> <configuration> <system.serviceModel> <services> <service name="Comit.TrafficService.Services.MobileErrorService"> <host> <baseAddresses> <add baseAddress="http://192.168.0.161:9999"/> </baseAddresses> </host> <endpoint address="http://192.168.0.161:9999/Comit/TrafficService/Services" binding="webHttpBinding" contract="Comit.TrafficService.Services.Contracts.IMobileError" behaviorConfiguration="RestfulBehavior" name="webHttpBinding"> </endpoint> </service> </services> <behaviors> <endpointBehaviors> <behavior name="RestfulBehavior"> <webHttp/> <dataContractSerializer ignoreExtensionDataObject="true"/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> </configuration> Host: using System; using System.Collections.Generic; using System.Linq; using System.ServiceModel; using System.Text; using Comit.TrafficService.Services; namespace ServiceTest { class Program { static void Main(string[] args) { using (ServiceHost host = new ServiceHost(typeof(MobileErrorService))) { host.Opened += delegate { Console.WriteLine("CalculaorService????,????????!"); }; host.Open(); Console.Read(); } } } } Client code: using System; using System.ServiceModel; using System.ServiceModel.Description; using TestWCFRest.WcfServices.Services; using System.Net; namespace TestWCFRest.WcfServices.Hosting { class Program { static void Main(string[] args) { //using (ServiceHost host = new ServiceHost(typeof(CalculatorService))) //{ // host.Opened += delegate // { // Console.WriteLine("CalculaorService????,????????!"); // }; // host.Open(); // Console.Read(); //} HttpWebRequest req = null; HttpWebResponse res = null; try { string url = "http://192.168.0.161:9999/Comit/TrafficService/Services/ErrorReport"; req = (HttpWebRequest)WebRequest.Create(url); req.Method = "POST"; req.ContentType = "application/xml; charset=utf-8"; req.Timeout = 30000; req.Headers.Add("SOAPAction", url); System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument(); xmlDoc.XmlResolver = null; xmlDoc.Load(@"d:\test.xml"); string sXML = xmlDoc.InnerXml; req.ContentLength = sXML.Length; System.IO.StreamWriter sw = new System.IO.StreamWriter(req.GetRequestStream()); sw.Write(sXML); sw.Close(); res = (HttpWebResponse)req.GetResponse(); } catch (Exception ex) { System.Console.WriteLine(ex.Message); } } } } It's my first time I'm trying to do somethinf with WCF so I don't know how to solve this problem. Since there is a lot of professionals here, I would appreciate your help in solving this. Thank you in advance!

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• wcf rest service 400 error : There might be a typing error in the address

  - by Lokesh Kondapalli

  I am trying to invoke wcf rest service from url but its showing error like this Error : Most likely causes: •There might be a typing error in the address. •If you clicked on a link, it may be out of date. ** I need JSON responce Here my code : Iservice.cs using System; using System.Collections.Generic; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.ServiceModel.Web; using System.Text; namespace SampleRestSample { interface name "IService1" in both code and config file together. [ServiceContract] public interface IService1 { [OperationContract] [WebInvoke(Method = "GET", UriTemplate = "Book/{id}", BodyStyle = WebMessageBodyStyle.Wrapped, ResponseFormat = WebMessageFormat.Json)] List<Prasad> GetBookById(string id); } [DataContract] public class Prasad { [DataMember] public string Name { get; set; } [DataMember] public string Age { get; set; } } } Service1.svc.cs using System; using System.Collections.Generic; using System.Linq; using System.Runtime.Serialization; using System.ServiceModel; using System.ServiceModel.Web; using System.Text; namespace LoginRestSample { // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together. public class Service1 : SampleRestSample { List<Prasad> list = new List<Prasad>(); public List<Prasad> GetBookById(string id) { try { Prasad cls = new Prasad(); cls.Age = "24"; cls.Name = "prasad"; list.Add(cls); //int bookId = Convert.ToInt32(id); //using (SampleDbEntities entities = new SampleDbEntities()) //{ // return entities.Books.SingleOrDefault(book => book.ID == bookId); //} } catch { throw new FaultException("Something went wrong"); } return list; } } } web.config <?xml version="1.0" encoding="utf-8"?> <configuration> <system.web> <compilation debug="true" targetFramework="4.0"> <assemblies> <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> </assemblies> </compilation> </system.web> <system.serviceModel> <services> <service name="WcfRestSample.SampleRestSample"> <endpoint address="" behaviorConfiguration="restfulBehavior" binding="webHttpBinding" bindingConfiguration="" contract="WcfRestSample.ISampleRestSample" /> <host> <baseAddresses> <add baseAddress="http://localhost/SampleRestSample" /> </baseAddresses> </host> </service> </services> <behaviors> <endpointBehaviors> <behavior name="restfulBehavior"> <webHttp automaticFormatSelectionEnabled="true" /> </behavior> </endpointBehaviors> <serviceBehaviors> <behavior name=""> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> <serviceHostingEnvironment multipleSiteBindingsEnabled="true" /> </system.serviceModel> <system.webServer> <modules runAllManagedModulesForAllRequests="true" /> </system.webServer> </configuration> Any solutions? Thank you in advance.

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• How to disable authentication schemes for WCF Data Services

  - by Schneider

  When I deployed my WCF Data Services to production hosting I started to get the following error (or similar depending on which auth schemes are active): IIS specified authentication schemes 'Basic, Anonymous', but the binding only supports specification of exactly one authentication scheme. Valid authentication schemes are Digest, Negotiate, NTLM, Basic, or Anonymous. Change the IIS settings so that only a single authentication scheme is used. Apparently WCF Data Services (WCF in general?) cannot handle having more than once authentication scheme active. OK so I am aware that I can disable all-but-one authentication scheme on the web application via IIS control panel .... via a support request!! Is there a way to specify a single authentication scheme on a per-service level in the web.config? I thought this might be as straight forward as making a change to <system.serviceModel> but... it turns out that WCF Data Services do not configure themselves in the web config. If you look at the DataService<> class it does not implement a [ServiceContract] hence you cannot refer to it in the <service><endpoint>...which I presume would be needed for changing its configuration via XML. P.S. Our host is using II6, but both solutions for IIS6 & IIS7 appreciated.

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• Returning Meaningful Exceptions from a WCF Project

  - by MissingLinq

  I am pretty new to WCF in general. What little experience I have comes from using fairly simple .SVC services in ASP.NET web applications. I tried experimenting with using a WCF Project for the first time, and ran into a major show-stopper. As I’m sure most are aware, for some strange reason, in a web application in which the customErrors mode is set to On , services (both .ASMX and .SVC) will not return exception details to the client. Instead, the exception and stack trace are emptied, and the message always reads “There was an error processing the request”, which is not at all helpful. When services are directly hosted inside the web application itself, it’s easy to work around this restriction by placing the services in a dedicated folder, and setting for that folder. However, I’m running into this same issue with exceptions not being returned from services that live in a separate WCF project. Thing is, I don’t know how to work around that. In a nutshell: I need to get my WCF Project services to bubble REAL exceptions to the client – or at least, the original exception message, instead of “There was an error processing the request”.

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• WCF Services (with RIA)

  - by netlogging

  I am new to WCF and WCF derived services. I am using VS 2010, silverlight 4, ria services 4. Recently I created plain WCF REST services (no RIA, no SOAP) with my endpoint (using wsHttpBinging): <endpoint address="" behaviorConfiguration="wsBehavior" binding="wsHttpBinding" bindingConfiguration="wsbinding" contract="WcfService1.IService1"/> <behaviors> <endpointBehaviors> <behavior name="wsBehavior"> <webHttp/> </behavior>......... I use this service from silverlight 4 client and everything works fine. THEN, i created new project using "silverlight Business application" template which used RIA service. Now the web.config uses DomainServices and when i add wsHttpBind endpoint I doesnot work. I know i am not doing this correctly and i cant find any help online so far. What I am trying to do is creat a RESTful WCF application with RIA (no SOAP) and that i can use from silverlight 4 client. For some reason i cannot get the service working.

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• How significant is .NET 3.5 SP1 for WCF/REST?

  - by Edward Tanguay

  I just worked through a book on WCF and was surprised that it didn't even mention REST at all. Was REST an afterthought for WCF that was added in .NET 3.5 SP1 and hence not baked in well or is it well integrated? I assume that Silverlight and XBAPs can consume WCF with no problem or do they have some limitation due to their sandbox environments? I've been reading that some people are having problems getting WCF to play well with XBAP and I would assume there are similar problems with Silverlight.

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• Configuring WCF to Handle a Signature on a SOAP Message from an Oracle Server

  - by AlEl

  I'm trying to use WCF to consume a web service provided by a third-party's Oracle Application Server. I pass a username and password and as part of the response the web service returns a standard security tag in the header which includes a digest and signature. With my current setup, I successfully send a request to the server and the web service sends the expected response data back. However, when parsing the response WCF throws a MessageSecurityException, with an InnerException.Message of "Supporting token signatures not expected." My guess is that WCF wants me to configure it to handle the signature and verify it. I have a certificate from the third party that hosts the web service that I should be able to use to verify the signature. It's in the form of -----BEGIN CERTIFICATE----- [certificate garble] -----END CERTIFICATE----- Here's a sample header from a response that makes WCF throw the exception: <?xml version="1.0" encoding="UTF-8"?> <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Header> <wsse:Security soap:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"> <dsig:Signature xmlns="http://www.w3.org/2000/09/xmldsig#" xmlns:dsig="http://www.w3.org/2000/09/xmldsig#"> <dsig:SignedInfo> <dsig:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> <dsig:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/> <dsig:Reference URI="#_51IUwNWRVvPOcz12pZHLNQ22"> <dsig:Transforms> <dsig:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> </dsig:Transforms> <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> <dsig:DigestValue> [DigestValue here] </dsig:DigestValue> </dsig:Reference> <dsig:Reference URI="#_dI5j0EqxrVsj0e62J6vd6w22"> <dsig:Transforms> <dsig:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/> </dsig:Transforms> <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/> <dsig:DigestValue> [DigestValue here] </dsig:DigestValue> </dsig:Reference> </dsig:SignedInfo> <dsig:SignatureValue> [Signature Value Here] </dsig:SignatureValue> <dsig:KeyInfo> <wsse:SecurityTokenReference xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"> <wsse:Reference URI="#BST-9nKWbrE4LRv6maqstrGuUQ22" ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3"/> </wsse:SecurityTokenReference> </dsig:KeyInfo> </dsig:Signature> <wsse:BinarySecurityToken ValueType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-x509-token-profile-1.0#X509v3" EncodingType="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-soap-message-security-1.0#Base64Binary" wsu:Id="BST-9nKWbrE4LRv6maqstrGuUQ22" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"> [Security Token Here] </wsse:BinarySecurityToken> <wsu:Timestamp wsu:Id="_dI5j0EqxrVsj0e62J6vd6w22" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"> <wsu:Created>2010-05-26T18:46:30Z</wsu:Created> </wsu:Timestamp> </wsse:Security> </soap:Header> <soap:Body wsu:Id="_51IUwNWRVvPOcz12pZHLNQ22" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"> [Body content here] </soap:Body> </soap:Envelope> My binding configuration looks like: <basicHttpBinding> <binding name="myBinding" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard" maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <security mode="TransportWithMessageCredential"> <transport clientCredentialType="None" proxyCredentialType="None" realm="" /> <message clientCredentialType="UserName" algorithmSuite="Default" /> </security> </binding> </basicHttpBinding> I'm new at WCF, so I'm sorry if this is a bit of a dumb question. I've been trying to Google solutions, but there seem to be so many different ways to configure WCF that I'm getting overwhelmed. Thanks in advance!

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• WCF Message Debugging on Custom Binding

  - by Programming Hero

  I've created a custom binding in WCF for a custom MessageEncoder to allow messages to be written as XML using a wider range of encodings than WCF supports out of the box. The encoder appears to be working and I am able to send and receive messages, but I want to verify that the XML message being written is exactly as required by the service I am trying to consume. I've turned on message logging for WCF using the diagnostic trace listeners to output the messages sent and received over the wire to a log file. Unfortunately, for calls using my encoder, the message is displayed as ... stream ... EDIT: I don't think it's anything to do with my custom encoding. I have experimented with my custom binding a little, switching to using the built-in text encoding and http transport. I still don't get a message body logged in the message trace. Is there anything that needs to be specified within a custom binding to enable message logging?

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• Professional WCF 4.0: Windows Communication Foundation with .NET 4.0

  - by cibrax

  The book in which I been working on since last year finally went to the light this week. It has been the result of hard work between me and three other Connected Systems MVP, my friend Fabio Cozzolino, Kurt Claeys and Johann Grabner. If you are interested in learning the new features in WCF 4.0, but also WCF in general and how to apply in real world scenarios, this book is for you. I dedicated three chapters of this book to one of my favorites topics, Security, from the basics to more complicated scenarios with Claim-Based security and Federated authentication using WCF services with Windows Identity Foundation. You can find more information about the book and the table of contents in the Wrox web site here.

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• C# WCF/WebService: Interoperable exception handling.

  - by michael paul

  I understand that WCF will convert an exception into a fault and send it back as a SOAP message, but I was wondering if this is truly interoperable. I guess I'm having a tough time trying to figure out this possible scenario: Client (Java) calls a WCF Service (LoginService). Server checks for proper authorization, user authorization fails. Server throws an UnauthorizedAccessException. WCF converts this into a Fault somehow. (* - See Below As Well) Client has to be able to know how to read this Fault. I guess I'm just having a tough time understanding how this could still be interoperable because it is expecting Java to know how to translate a SOAP Fault that .NET encodes from an UnauthorizedAccessException. Also, how does .NET actually convert the exception to a fault, what goes in as the fault code, name, etc. Some of the things seem to be "duh"s like perhaps the Fault Name is "UnauthorizedAccessException", but I'd rather know for sure than guess.

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• Passing Custom headers from .Net 1.1 client to a WCF service

  - by sreejith

  I have a simple wcf service which uses basicHttp binding, I want to pass few information from client to this service via custom SOAP header. My client is a .net application targetting .Net 1.1, using visual studio I have created the proxy( Added a new web reference pointing to my WCF service) I am able to call methods in the WCF service but not able to pass the data in message header. Tried to override "GetWebRequest" and added custom headers in the proxy but for some reason when I tried to access the header using "OperationContext.Current.IncomingMessageHeaders.FindHeader" it is not thier. Any idea how to solve this prob? This is how I added the headers protected override System.Net.WebRequest GetWebRequest(Uri uri) { HttpWebRequest request; request = (HttpWebRequest)base.GetWebRequest(uri); request.Headers.Add("tesData", "test"); return request; }

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• Reuse classes and objects for both WCF and non-WCF

  - by joebeazelman

  I have several classes such as Order, Customer, etc. These classes serve for holding data and nothing more. I want to be able to reuse these classes in other projects in the future, but for some reason I don't quite understand, WCF forces me to decorate the data members with the [DataMember] attribute, forcing me to reference WCF plumbing that I will never use in other projects. I would imagine that WCF lets you take any serializable class and use it as a content type. Am I understanding this correctly?

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• Does GoDaddy supports RESTful services via WCF

  - by Amir Naor

  After deploying a WCF RESTful service that i created using the REST started kit, i got several errors that i managed to solve following this post: http://www.edoverip.com/edoverip/index.php/2009/01/30/running-wcf-on-godaddy Now i'm stuck with this error: IIS specified authentication schemes 'Basic, Anonymous', but the binding only supports specification of exactly one authentication scheme. Valid authentication schemes are Digest, Negotiate, NTLM, Basic, or Anonymous. Change the IIS settings so that only a single authentication scheme is used I saw that others got to this point without a solution. GoDaddy support dont know nothing. Is it possible at all? Are there any web hosting services that you know that support that?

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• Config for WCF with multiple endpoints

  - by vdh_ant

  Hi guys I'm new to WCF and am trying to get some ideas I have off the ground. Basically I have a web WCF Application project with the following in its web.config: <system.serviceModel> <services> <service name="WcfService1.ServiceContract.IDirectorySearchService" behaviorConfiguration="defaultServiceBehavior"> <endpoint name="restxml" address="xml" binding="webHttpBinding" contract="WcfService1.ServiceContract.IDirectorySearchServiceXml" behaviorConfiguration="xmlRestBehavior"/> <endpoint name="restjson" address="json" binding="webHttpBinding" contract="WcfService1.ServiceContract.IDirectorySearchServiceJson" behaviorConfiguration="jsonRestBehavior"/> <endpoint name="soap" address="soap" binding="basicHttpBinding" contract="WcfService1.ServiceContract.IDirectorySearchService"/> <endpoint name="mex" address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="defaultServiceBehavior"> <serviceDebug includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> <endpointBehaviors> <behavior name="xmlRestBehavior"> <webHttp/> </behavior> <behavior name="jsonRestBehavior"> <enableWebScript/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> My interfaces look like this: [ServiceContract] public interface IDirectorySearchServiceXml { [OperationContract] [WebGet(UriTemplate = "Search/")] SearchResults Search(); } [ServiceContract] public interface IDirectorySearchServiceJson { [OperationContract] [WebGet(UriTemplate = "Search/")] SearchResults Search(); } [ServiceContract] public interface IDirectorySearchService { [OperationContract] SearchResults Search(int? sportId, int? instituteId, DateTime? startDate, DateTime? endDate); } Now the part I am having a little trouble with is what else I need to get this up and running... Like given this what .svc files do I need and do I have the config right... Also what addresses do I need to use to get this running either through the browser or through the WCF test client. Note I am currently using 3.5. Cheers Anthony

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• Different return XML in a WCF Operation

  - by Sean Hederman

  I am writing a service to a international HTTP standard, and there is one method that can return three different XML results, call them Single, Multiple and Error. Now I've written an IXmlSerializable class that can consume each of these results and generate them. However, WCF seems to insist that I can only have a single return XML root name. I have to choose an XmlRoot for my custom object of either Single, Multiple or Error. How can I set up WCF so that I can choose at runtime what the root will be? This is what I have currently. /// <summary> /// A collection of items. /// </summary> [XmlRoot("Multiple", Namespace = "DAV:")] public sealed class ItemCollection : IEnumerable<Item>, IXmlSerializable /// <summary> /// Processes and returns the items. /// </summary> [WebInvoke(Method = "POST", UriTemplate = "{*path}", BodyStyle = WebMessageBodyStyle.Bare)] [OperationContract] [XmlSerializerFormat] ItemCollection Process(string path);

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• REST and redirecting the response

  - by Duane Gran

  I'm developing a RESTful service. Here is a map of the current feature set: POST /api/document/file.jpg (creates the resource) GET /api/document/file.jpg (retrieves the resource) DELETE /api/document/file.jpg (removes the resource) So far, it does everything you might expect. I have a particular use case where I need to set up the browser to send a POST request using the multipart/form-data encoding for the document upload but when it is completed I want to redirect them back to the form. I know how to do a redirect, but I'm not certain about how the client and server should negotiate this behavior. Two approaches I'm considering: On the server check for the multipart/form-data encoding and, if present, redirect to the referrer when the request is complete. Add a service URI of /api/document/file.jpg/redirect to redirect to the referrer when the request is complete. I looked into setting an X header (X-myapp-redirect) but you can't tell the browser which headers to use like this. I manage the code for both the client and the server side so I'm flexible on solutions here. Is there a best practice to follow here?

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• PHP API to trade products from eshop through REST/xml

  - by Donatas Veikutis

  I need algorithm, or PHP api example, or existing decision how to make system for trade big information for B2B xml with goods information. Now I try to use Slim framework to do that system. But for me need some documentation what architecture have to be in here. System requiments is simple: User have autentification username and password Then he can see which product groups assigned to it Then he can see all product with information (price, title, description, images, specifications etc.). Its will the easiest way to get a free php api for that I think, and try too edit some code. But I did not found anything.

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• REST - Tradeoffs between content negotiation via Accept header versus extensions

  - by Brandon Linton

  I'm working through designing a RESTful API. We know we want to return JSON and XML for any given resource. I had been thinking we would do something like this: GET /api/something?param1=value1 Accept: application/xml (or application/json) However, someone tossed out using extensions for this, like so: GET /api/something.xml?parm1=value1 (or /api/something.json?param1=value1) What are the tradeoffs with these approaches? Is it best to rely on the accept header when an extension isn't specified, but honor extensions when specified? Is there a drawback to that approach?

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• "Invalid operation" status code in a HATEOAS REST API

  - by FinnNk

  In a HATEOAS API links are returned which represent possible state transitions. A conforming client should just be retrieving and following those links, but if a non-conforming client is constructing URIs rather than following the supplied links what would be the most appropriate status code/response to return? 400 would work, together with some information in the response body - this is what we're currently doing 403 I guess would be wrong, as it implies that the request could never work - but potentially the link may be available in the future 404 sounds plausible - at this point in time the resource doesn't exist What do people think? I know that conditional requests can handle requests based on stale responses (resulting in e.g. 412s), but this is a slightly different situation.

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• WCF RIA Services feedback

  - by pluginbaby

    If you use or plan to use WCF RIA Services, here is your chance to shape the future of this product, vote or propose features for vNext in this page: http://dotnet.uservoice.com/forums/57026-wcf-ria-services You can find help and ask questions on the current release of RIA Services on the official forum: http://forums.silverlight.net/forums/53.aspx

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• WCF and Service Registry

  - by TK Lee

  I am about to build some WCF Services. Those services need to communicate to each others too, in some scenarios. I've done some "Google-ing" about Service Registry but can't figure out how to implement service registry with WCF; is there any other alternate? Is there any Microsoft technology available for Service Registry? I'm new to SOA and I will really appreciate any help or guidance (what and where should I exactly look for registry services).

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• Is .NET WCF worth the effort?

  - by SnOrfus

  Maybe it's me, but I've never encountered nearly as many problems, annoying challenges, indirect error messages and general frustrations with any other technology as I have with WCF. What are the ACTUAL benefits? Not the MS Press Release benefits of 'a unified architecture for something something that's not going to work anyway.' And are those benefits worth the annoying frustrations? I'm normally a big MS fanboy over here, but I just can't get behind WCF.

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• wcf - maximum array length quota

  - by dav.evans

  Im writing a small wcf/wpf app to resize images but wcf is giving me grief when I try to send an image of size 28K to my service from the client. The service works fine when I send it smaller images. I immediately assumed that this was a configuration issue and I've trawled the web looking at posts regarding the MaxArrayLength property in my binding configuration. Ive upped the limits on these settings on both the client and server to the maximum 2147483647 but still I get the following error: {"The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://mywebsite.com/services/servicecontracts/2009/01:OriginalImage. The InnerException message was 'There was an error deserializing the object of type System.Drawing.Image. The maximum array length quota (16384) has been exceeded while reading XML data. This quota may be increased by changing the MaxArrayLength property on the XmlDictionaryReaderQuotas object used when creating the XML reader.'. Please see InnerException for more details."} Ive made my client and server configs the same and they look like the following: Server: <system.serviceModel> <bindings> <netTcpBinding> <binding name="NetTcpBinding_ImageResizerServiceContract" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxConnections="10" maxReceivedMessageSize="2147483647"> <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Transport"> <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" /> <message clientCredentialType="Windows" /> </security> </binding> </netTcpBinding> </bindings> <behaviors> <serviceBehaviors> <behavior name="ServiceBehavior"> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> <services> <service name="LogoResizer.WCF.ServiceTypes.ImageResizerService" behaviorConfiguration="ServiceBehavior"> <host> <baseAddresses> <add baseAddress="http://localhost:900/mex/"/> <add baseAddress="net.tcp://localhost:9000/" /> </baseAddresses> </host> <endpoint binding="netTcpBinding" contract="LogoResizer.WCF.ServiceContracts.IImageResizerService" /> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> </system.serviceModel> and my client config looks like: <system.serviceModel> <bindings> <netTcpBinding> <binding name="NetTcpBinding_ImageResizerServiceContract" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions" hostNameComparisonMode="StrongWildcard" listenBacklog="10" maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxConnections="10" maxReceivedMessageSize="2147483647"> <readerQuotas maxDepth="32" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Transport"> <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" /> <message clientCredentialType="Windows" /> </security> </binding> </netTcpBinding> </bindings> <client> <endpoint address="net.tcp://localhost:9000/" binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ImageResizerServiceContract" contract="ImageResizerService.ImageResizerServiceContract" name="NetTcpBinding_ImageResizerServiceContract"> <identity> <userPrincipalName value="[email protected]" /> </identity> </endpoint> </client> </system.serviceModel> It seems no matter what I set these values to I still get an error saying wcf cannot serialize my file because its greater than 16384. Any ideas? edit: the email address in the userPrincipalName tag has been altered for my privacy

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• How to achieve a loosely coupled REST API but with a defined and well understood contract?

  - by BestPractices

  I am new to REST and am struggling to understand how one would properly design a REST system to both allow for loose coupling but at the same time allow a consumer of a REST API to understand the API. If, in my client code, I issue a GET request for a resource and get back XML, how do I know what to do with that xml? e.g. if it contains <fname>John</fname><lname>Smith</lname> how do I know that these refer to the concept of "first name", "last name"? Is it up to the person writing the REST API to define in documentation some place what each of the XML fields mean? What if producer of the API wants to change the implementation to be <firstname> instead of <fname>? How do they do this and notify their consumers that this change occurred? Or do the consumers just encounter the error and then look at the payload and figure out on their own that it changed? I've read in REST in Practice that using a WADL tool to create a client implementation based on the WADL (and hide the fact that you're doing a distributed call) is an "anti-pattern". But I was planning to do this-- at least then I would have a statically typed API call that, if it changed, I would know at compile time and not at run time. Why is this a bad thing to generate client code based on a WADL? And how do I know what to do with the links that returned in the response of a POST to a REST API? What defines this contract and gives true meaning to what each link will do? Please help! I dont understand how to go from statically-typed or even SOAP/RPC to REST!

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