Consuming A WCF REST Service From Android Is Very Slow?
Aug 31, 2010
I have a WCF REST service built with C# and it returns an image as part of a CPU intensive operation. The client is running on Android (Java) By default, it will return a text JSON object that looks something like this:
{"d",[9,0,77,12,11,...]}
Those are they bytes of the image. Fine. However, all the solutions for decoding this JSON are intolerably slow. I've tried Gson, Jackson, and the built-in Android JSONObject class. I have no idea why they are so slow.
As an alternative solution, I have my REST service return a GUID, and then that GUID can be used by the Android client to go to a regular URL that serves up the image as a regular binary stream, via an MVC controller.
This works well, and it fast, and is pretty easy to handle on the Android side. However, it does feel like a bit of kludge and kind of a violation of the REST design principles. Am I missing something here? Is there a better way to do this?
this method i can access using asp.net but not by using a android.. i have checked for the headers etc.. the response is OK in android while debugging but the data is not inserted..
what is the equivalent of stringbuilder in android??
in android i use
StringEntity se = new StringEntity(json.toString());
//and post the data to my service...
post.setEntity(se);
what is the equivalent of stringentity in C# and what can i do for this prob?
I'm trying to consume the following web service http://ipinfodb.com/ip_location_api.php this web service returns an xml response, the code below gets the XML response, but somehow when phasing the values from the XML response it does not work.
What is wrong with my code?
using System; using System.Collections.Generic; using System.Text; using System.Web; using System.IO; using System.Net; using System.Xml;
namespace ConsoleApplication3 { class Program { static void Main(string[] args) { HttpWebRequest request = null; HttpWebResponse response = null; String Xml; // Create the web request request = WebRequest.Create("http://api.ipinfodb.com/v2/ip_query.php?key=<yourkey>&ip=74.125.45.100&timezone=true") as HttpWebRequest; // Get response using (response = request.GetResponse() as HttpWebResponse) { // Get the response stream StreamReader reader = new StreamReader(response.GetResponseStream()); Xml = reader.ReadToEnd(); } // Console xml output Console.WriteLine(Xml); //see if we get the xml response, (YES we do) Console.ReadLine(); string _currentField = ""; StringReader _sr = new StringReader(Xml); XmlTextReader _xtr = new XmlTextReader(_sr); _xtr.XmlResolver = null; _xtr.WhitespaceHandling = WhitespaceHandling.None; // get the root node _xtr.Read(); if ((_xtr.NodeType == XmlNodeType.Element) && (_xtr.Name == "Response")) { while (_xtr.Read()) { if ((_xtr.NodeType == XmlNodeType.Element) && (!_xtr.IsEmptyElement)) { _currentField = _xtr.Name; _xtr.Read(); if (_xtr.NodeType == XmlNodeType.Text) { switch (_currentField) { case "Status": Console.WriteLine(_xtr.Value); //we print to console for testing purposes, normally assign it to a variable here! break; case "CountryCode": Console.WriteLine(_xtr.Value); break; case "CountryName": Console.WriteLine(_xtr.Value); break; case "RegionCode": Console.WriteLine(_xtr.Value); break; case "RegionName": Console.WriteLine(_xtr.Value); break; case "City": Console.WriteLine(_xtr.Value); break; case "ZipPostalCode": Console.WriteLine(_xtr.Value); break; case "Latitude": Console.WriteLine(_xtr.Value); break; case "Longitude": Console.WriteLine(_xtr.Value); break; case "Gmtoffset": Console.WriteLine(_xtr.Value); break; case "Dstoffset": Console.WriteLine(_xtr.Value); break; case "TimezoneName": Console.WriteLine(_xtr.Value); break; case "Isdst": Console.WriteLine(_xtr.Value); break; case "Ip": Console.WriteLine(_xtr.Value); break; default: // unknown field throw new Exception("Unknown field in response."); } } } } } Console.ReadLine(); } } } EDIT: this is the XML response returned <?xml version="1.0" encoding="UTF-8" ?> - <Response> <Status>OK</Status> <CountryCode>US</CountryCode> <CountryName>United States</CountryName> <RegionCode>06</RegionCode> <RegionName>California</RegionName> <City>Mountain View</City> <ZipPostalCode>94043</ZipPostalCode> <Latitude>37.4192</Latitude> <Longitude>-122.057</Longitude> <Gmtoffset>-28800</Gmtoffset> <Dstoffset>0</Dstoffset> <TimezoneName>America/Los_Angeles</TimezoneName> <Isdst>0</Isdst> <Ip>74.125.45.100</Ip> </Response>
for the past couple of days i am facing an issue where the first call from my ASP.NET 4 application (VS 2010 Web Site) hosted in IIS 7 to an XML web service is dead-slow. subsequent calls are fast until the AppDomain is restarted.
I have tried all solutions related to pre-generating the serializer assembly but nothing worked. Anyway THEN I was sure it is an IIS-only issue because if i consume the xml web service from a console .net application then all the calls are fast. its even fast from an ASP.NET web site NOT hosted in IIS instead running on the development server. SO clearly the problem is there only when my app is hosted in IIS.
I need to call a Rest service but would like to do so without having to redirect. Here is my dilemma. The Rest service we are trying to integrate offers the option to sign up for a subscription but does not allow us to upgrade an existing subscription. So if a user wants to upgrade an existing subscription we have to first cancel and then have the user sign up for a brand new subscription. I don't know how I can make this so it flows nicely in my code. I ideally I would like to do something like this
User decides to upgrade
Click upgrade button
Existing account is being cancelled, if cancellation was successful
New account is being created
How can I do this with a Rest service? Here is a sample URI/URL
Could anybody give me some ideas how to make this work in an elegant manner. We thought we could keep the old subscription and then just sign the user up for a new subscription for the difference of the money. For example the first subscription would be 2.95 and the second one would be 2.00 which would amount to a subscription of 4.95. I think it is not elegant and the user would see 2 charges on the credit card, weird, I think. Since I don't know much about Rest maybe there is a way that this can be solved.
I have developed an rest enable wcf service by using the following link
[URL]
Now I want to know is there any difference between rest enabled wcf service (or restful web service) & rest web service ? If there is any difference then what is that ? If there is difference the can you provide me any link (which represents steps visually as in above link) through which I can develop rest web service ?
To get a search website built quickly I plan to split the work between two teams: One to build the search engine and one to build web UIs (mobile/desktop). My plan is to build the search engine as a set of REST services based on .NET 3.5. UIs may be built using some other technology.Questions: is the REST interface likely to be a performance bottleneck? How best to avoid this?
ERROR MESSAGE:When visiting this URL directly: http://localhost:57667/ExampleService.svc/ProcessRequest
The exception message is 'No component for key example.ExternalWebServiceStubs.Example.ExampleService was found'. Castle.MicroKernel.DefaultKernel.get_Item(String key) at Castle.Facilities.WcfIntegration.WindsorInstanceProvider.GetInstance
I have put a simple service on my site which requires the input of a string and it will return an array as its output.The service works fine on my PC; however, I have published the site online and the web services don't work?
I'm taking over a project for a former co-worker. We're consuming a web service which requires authentication. The former co-worker was unable to call the service using WCF. I'm mostly unfamiliar with web services but was also unable to get it to authenticate.Upon speaking w/ the original developer, I was told that I'd have to build a project in VS 2005 in order to consume the service and that WSE 3 would have to be used, instead of WCF. He has some code that did indeed build and run on his PC, while he was here. I'm now unable to get it to build.
I'm running VS 2005 on XP and have WSE 3.0 installed and enabled on the project, which is a C# class library. I successfully made a Web Reference to the service and generated a proxy. In trying to test it, the first few lines of my code look like this:
[Code]....
...problem is, it says that the proxy that was generated does not have RequestSoapContext!
I am trying to create a wrapper class for the MusicBrainz CD database using VB.NET. I have a test URL that produces an XML response:[URL]I need to get that response into an XMLDocument object in .NET. I have tried XMLDocument.Load, WebClient.DownloadString, and HttpWebRequest through a StreamReader. All produce: Unable to Connect To Remote Server. It is possible that my company firewall is the problem but I can access the URL just fine in a web browser.
Here's a simple question that Google isn't providing any good leads on:How I do consume this in VS 2008 or 2010?[URL]I have no control over it, I just have to consume it and use it. Adding it as a web reference in the project yields this error:[URL]was not recognized as a known document type.The error message from each known type may help you fix the problem:- Report from 'XML Schema' is 'The root element of a W3C XML Schema should be <schema> and its namespac"
I'm working with an outside company to impletement their API into our program. Most of their member functions working pretty solid. I get to the one function where I have to pass an associated array to it and this is where it blows up. I create a hash table or namevaluecollection and of course I will get the error(The type System.Collections.Hashtable is not supported because it implements IDictionary.), which can't be serialized.
Is there an easy way to pass this associated array to them? I don't think their api is very flexible, but they seem to think so.
I'm trying to consume a WSE enabled Web Service from an ASP.NET Web Site.I've installed WSE 3.0, used the config tool to add WSE info to my web.config and then done an Add Web Reference.I believe that the problem may be that this is a Web SITE, not a Web APPLICATION. As such, the proxy class is generated at runtime, perhaps not adding the WSE magic.I can access the proxy class from metadata, and it's of typeSystem.Web.Services.Protocols.SoapHttpClientProtocol, which as far as I can tell doesn't have any WSE functionality.I realize that this is all old technology, but I don't get to decide what the servers run :(
I need to access a web service. The WSDL is not available, even if I know everything about the service (url, method name and signature). I guess I could use HTTPRequest and HTTPResponse classes:HTTPResponse: should contains the XML Soap Response that I eventually parse.HTTPRequest: how to specify the service's and the method's parameters?
I've created a class library, now I'm trying to use it in a webservice.If I try and use it via a web method like this:
<WebMethod()> _Public Function GetStaffList() As List(Of ClassLibrary.Staff) End Function
I get this error:You must implement a default accessor on System.Security.Policy.Evidence because it inherits from ICollection. And I can't seem to find any coherent instructions on remedying this issue.If I copy the Staff class into the web service (app_code) it works hunky dory, so it must be security..I can't be the only one attempting this! MSDN doesn't explain this one too well :(
I have created a webservice which is publicly exposed. This publicly created webservice can be consumed in the application But my requirement is I have to create a webservice to expose the schema and cannot be consumed directly.How to consume the web service which is not exposed directly.
I have consumed an external webservice in my client application using WCF. And every thing works great in my Dev box(XP with IIS5.1)But when the same application is moved to Prod server(Win Server 2003 with IIS6.0) it fails. Below is the exception caught:
There was no endpoint listening at http://MyExternalWebServiceUrlWithSessionId could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.And the InnerException is: Unable to connect to the remote server.My Config file has the below settings:
I'm considering to host WCF Rest Service that i've built on IIS 7. The URL to access my service will be something like
[URL]
Recently, i've been looking to some REST API implementation with a clean URL like Yahoo API
[URL]
I'm wondering what will be the best WCF host environment (e.g. Windows Service) or any solution (e.g. URL rewrite module) considering that I dont want to have application name and .svc in my URL so that I can have a completely clean URL for my REST API
I am consuming the java web service in .net client, when i sent a request to that web service, i am getting one exception in response object.It says "Client found response content type of 'text/plain', but expected 'text/xml'", along with this message i am getting the response in that exception.
I'm fairly new to .NET development so I might be missing something very simple here. I'm trying to set up a web service as a data item so that I can bind it to a control on my page. I was reading some tutorials about doing this in an earlier version which seemed very simple. All you had to do was add the web reference, create a data source and use the object type, pick the web service and enter the name of the call that would retrieve the data.
In 2008 the object data source type doesn't seem to be available anymore when creating a new item unde app_data. I get options for SQL Server, XML and XML schema. I've tried adding an existing source and picking each of the files generated for my web service reference, with no success. I suspect that I have to use one of the XML options, though at this point my web service is a simple thing that only returns some strings for prototyping purposes (I'm not the one writing the web service, just the front ends. Our other developer hasn't come up with a stub service yet). I know there must be some way to set a web service up as a business object so that you can bind it to a control like a gridview.
I've a quick question and request you all to respond soon. I've developed a web service with Form based authentication as below. 1.An entry in web.config as below. <authentication mode="Forms">
For example, we are going to consume web method GetEmployeeByQuery(ConnInfoXML, Query, RecordDetail), ConnInfoXML is login information in XML, Query is a SQL statement selecting records, RecordDetail is all records retrieved. All data are in XML format.
So how to write these parameters in XML to consume this web method and get all the information in XML, and then transfer XML to normal string format ?
