I have a web api with a method to return string value. I am having this web api controller inside a web application. I am trying to call the method in the api using the following code:
Stream data = client.OpenRead(new Uri("http://localhost:40786/api/Getvalues/getstring"));
StreamReader reader = new StreamReader(data);
string s = reader.ReadToEnd();
Console.WriteLine(s);
data.Close();
reader.Close();
I am calling this method on click event of a web-page say Default.aspx. The code runs fine however instead of calling web-api and returning it's value, it is returning HTML mark-up of the page on which i have the button. No idea what is happening. Can anyone suggest what I am missing here ?
Try this code:
WebClient client = new WebClient();
string resultStr = client.DownloadString(http://localhost:40786/api/Getvalues/getstring");
Related
Why am I getting status code 405 in response when using httpClient or Fiddler?
I am getting a status code 405 response when tyring to access a net core 3.1 wepapi action method that accepts json string sent in the body as shown below.
The status code 405 occurs when the request is sent in a net core 3.1 console app using httpClient.
In Fiddler the request works fine.
The webapi action code is
[RequireHttps]
[HttpPut("setkdatainformation/{id:int:min(0):max(5)}/{info}")]
[Authorize(Roles = "Admin")]
public async Task<string> SetKDataInformation(int id, string info, [FromBody] string kinfo)
{
The request is sent from a .net core 3.1 console app using http client as shown below
var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(newMediaTypeWithQualityHeaderValue($"application/json"));
var dData = $"{q}kdata test{q}";
var content = new StringContent(dData, System.Text.Encoding.UTF8, "application/json");
var response = await httpClient.PutAsync(${url}api/v1.0/KDataServer/setkdatainformation/{connectionId}/{headerLoginName}", content);
The status code 405 occurs when the request is sent in a net core 3.1 console app using httpClient.
I did a test based on the code snippet you shared, which work well on my side. If possible, you can try to create a new project and create controller with only this action method then test if it can work well.
var q = "\"";
var connectionId = 2;
var headerLoginName = "test";
var httpClient = new HttpClient();
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue($"application/json"));
var dData = $"{q}kdata test{q}";
var content = new StringContent(dData, System.Text.Encoding.UTF8, "application/json");
var response = await httpClient.PutAsync($"https://xxxx/setkdatainformation/{connectionId}/{headerLoginName}", content);
In Fiddler the request works fine
You mentioned the request could be processed fine if you make it via fiddler, to troubleshoot the issue, you can capture the request that you sent from console app using fiddler, then compare the request url, header(s) and body etc with that working one you sent through fiddler and make sure you are making request(s) to same endpoint from both fiddler and console app.
I'm writing a WebAPI for handling PDF documents. It was written in a ashx page earlier implementing IHttpHandler and getting the context using HttpContext. I'm now writing it using WebAPI. In WebAPI we have HttpResponseMessage. For HttpContext.Response.BinaryWrite we have new ByteArrayContent in HttpResponseMessage. But what is the alternative for HttpContext.Response.OutputStream in WebAPI? I need to have the alternative of OutputStram in WebAPI because im passing this OutputStream as a parameter to another dll.
Code in ashx:
SomeReport.PdfReport rpt = new SomeReport.PdfReport(docID);
rpt.CreateReport(context.Response.OutputStream);
Actually you can use any stream for example MemoryStream but result should be wrapped into StreamContent.
public HttpResponseMessage Get()
{
var response = Request.CreateResponse();
var outputStream = new MemoryStream();
//write data to output stream
//or passing it to somewhere
outputStream.WriteByte(83);
outputStream.Position = 0;
response.Content = new StreamContent(outputStream);
return response;
}
If you need direct writing to output stream, please consider using PushStreamContent. Example
I need to send a gzipped byte array over HTTPS. I searched the web and only thing ı can found is SharpGIS.GZipWebClient.
However, the problem is - this third party solution only works with WebClient which allow you to send only String data.
(I'm on Windows Phone 8. Most of the WebClient methods do not exist.)
Any ideas to solve this problem?
Edit:
This is how I tried the POST JSON data over HTTPS using SharpGIS;
WebClient webClient = new SharpGIS.GZipWebClient();
webClient.Headers["Accept-Encoding"] = "gzip";
var uri = new Uri(pUrl, UriKind.Absolute);
webClient.UploadStringCompleted += new UploadStringCompletedEventHandler(wc_UploadStringCompleted);
webClient.UploadStringTaskAsync(uri, jsonAsString);
But it doesn't compresses the string as well(as using OpenWriteSync method).
You write the post data in the OpenWriteCompleted handler, like this:
void webClient_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
Stream s = e.Result;
s.Write(jsonAsByteArray, 0, jsonAsByteArray.Length);
s.Flush();
s.Close();
}
You should also add the appropriate error handling.
i have a web services which i am accessing in my client application(metro app) , but i want to access a particular method inside those many methods i have how should i do it ,
as of now , i am doing it in this way to accessing the web services from my metro app:-
private async void Button_Click_1(object sender, RoutedEventArgs e)
{
string responseBodyAsText;
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync("http://182.134.34.99/OE/examplewebservices.svc");
response.EnsureSuccessStatusCode();
StatusText.Text = response.StatusCode.ToString();
responseBodyAsText = await response.Content.ReadAsStringAsync();
}
my requirement is :- there are many methods inside that examplewebservices , so i want to access one of the method inside that , pass input parameters to that method and get the result.
1)How to access one a particular method inside those many methods ( from metro app) ?
2)how to pass input to that service method (from metro app)?
Question might be very basic to you , pls help out. i am new to metro application development.
Thanks in advance.
The code you have does not call a service, it downloads service definition page. You will need to add a service reference to your project (right click on project node, choose Add Service Reference from context menu). Then you will be able to call methods of your service. In WinRT app, you will only be able to call web service asynchronously, so all methods will have 'Async' suffix and you will have to use async/await pattern when calling it.
To call an operation on the service you can use this pattern:
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri("http://182.134.34.99/OE/examplewebservices.svc");
HttpResponseMessage response = await client.GetAsync("MyOperation");
...
}
To send values in this simplistic example you can send them as QueryStrings appended to the MyOperation string as follows: MyOperation?myvalue=1 etc.
Other than that #Seva Titov gave a good response to the dynamic aspect.
I've been racking my brain for a couple of days now on how to approach a new requirement.
I have two websites. The first one lets the user fill out an application. The second website is an internal website use to manage the users applications. I need to develop a "web service" that sends the application data from website 1 to website 2 and return a response to website 2 of success or failure. I have never done a web service before and I'm a bit confused on where to start. I've been reading various examples online but they all seem to be just a starting point for building a webservice... no specific examples.
So for posting the data website 1, what would my controller method look like? Do I use Json to post the data to website 2? What would and example of that look like? Is there some form of redirect in the method that points to website 2?
So for posting the response back to website 2 what would that controller method look like? I assume I would use Json again to send the response back to website 1? Is there some form of redirect in the method that points back to website 1?
I would use JSON and POST the application to the web service.
First I am assuming the application data is contained in some type of object. Use JSON.Net to serialize the object into JSON. It will look something like the following code.
var application = new Application();
string serializedApplication = JsonConvert.Serialize(application);
Second is to POST the code your endpoint(webservice, mvc action). To this you'll need to make a HTTPRequest to the endpoint. The following code is what I use to make to POST the code.
public bool Post(string url, string body)
{
//Make the post
ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, errors) => true;
var bytes = Encoding.Default.GetBytes(body);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
Stream stream = null;
try
{
request.KeepAlive = false;
request.ContentLength = bytes.Length;
request.ContentType = "application/x-www-form-urlencoded";
request.Timeout = -1;
request.Method = "POST";
stream = request.GetRequestStream();
stream.Write(bytes, 0, bytes.Length);
}
finally
{
if (stream != null)
{
stream.Flush();
stream.Close();
}
}
bool success = GetResponse(request);
return success;
}
public bool GetResponse(HttpWebRequest request)
{
bool success;
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
if (response.StatusCode != HttpStatusCode.OK && response.StatusCode != HttpStatusCode.Created)
{
throw new HttpException((int)response.StatusCode, response.StatusDescription);
}
var end = string.Empty;
using (StreamReader reader = new StreamReader(responseStream))
{
end = reader.ReadToEnd();
reader.Close();
success = JsonConvert.DeserializeObject<bool>(end);
}
response.Close();
}
}
return success;
}
So now you have can POST JSON to an endpoint and receive a response the next step is to create the endpoint. The following code will get you started on an endpoint in mvc that will receive an application and process it.
[HttpPost]
public ActionResult SubmitApplication()
{
//Retrieve the POSTed payload
string body;
using (StreamReader reader = new StreamReader(Request.InputStream))
{
body = reader.ReadToEnd();
reader.Close();
}
var application = JsonConvert.Deserialize<Application>(body);
//Save the application
bool success = SaveApplication(application);
//Send the server a response of success or failure.
return Json(success);
}
The above code is a good start. Please note, I have not tested this code.
You have obviously more than one client for the data & operations. so a service is what you are looking for.
ASP.NET MVC is a good candidate for developing RESTful services. If you (and your Manager) are ready to use beta version, Then Checkout ASP.NET-Web API.
If you want to stay with a stable product, Go for MVC3. you may need to write some custom code to return the data in XML as well as JSON to server different kind of clients. There are some tutorials out there.
So create a Service (ASP.NET MVC / WCF Service) .You may then create 2 client apps, one for the external clients and another for the Internal users. Both of this apps can call methods in the Service to Create/ Read the user accounts / or whatever operation you want to do.
To make the apps more interactive and lively , you may conside including a wonderful thing called SiganalR, which helps you to get some real time data without continuosly polling the data base/ middle tier very in every n seconds !